Calculate The scientist repeats the experiment, burning a new sample of steel wool until it is entirely converted into iron oxide. The iron oxide produced has a mass of 715 g. What was the mass of the sample before burning?

Answers

Answer 1

Answer:

The mass of the steel wool before burning can be calculated by finding the difference between the mass of the steel wool and the mass of the iron oxide produced.

If the mass of the iron oxide produced is 715 g, then the mass of the steel wool before burning was:

Mass of steel wool before burning = Mass of steel wool + Mass of iron oxide produced

Since the steel wool was entirely converted to iron oxide, we know that the mass of iron in the steel wool is equal to the mass of iron in the iron oxide produced. Since iron has an atomic mass of 56 g/mol, we can use this to find the mass of iron in the 715 g of iron oxide:

Number of moles of iron = mass of iron oxide produced / atomic mass of iron

Number of moles of iron = 715 g / 56 g/mol

Number of moles of iron = 12.77 mol

Since the mass of iron in the steel wool is the same as the mass of iron in the iron oxide produced, we can use the same number of moles of iron to find the mass of steel wool before burning:

Mass of steel wool before burning = Number of moles of iron x (atomic mass of iron / molar mass of steel wool)

The molar mass of steel wool is the sum of the atomic masses of its constituent elements (iron and carbon) multiplied by their respective stoichiometric coefficients:

Molar mass of steel wool = (atomic mass of iron x 1) + (atomic mass of carbon x 1)

Molar mass of steel wool = (56 g/mol x 1) + (12.01 g/mol x 1)

Molar mass of steel wool = 68.01 g/mol

Substituting the known values into the equation, we get:

Mass of steel wool before burning = 12.77 mol x (56 g/mol / 68.01 g/mol)

Mass of steel wool before burning = 10.49 mol

Therefore, the mass of the steel wool before burning was:

Mass of steel wool before burning = Mass of steel wool + Mass of iron oxide produced

Mass of steel wool before burning = 715 g + (10.49 mol x 68.01 g/mol)

Mass of steel wool before burning = 1,428 g (rounded to the nearest whole number)

Explanation:

Answer 2

Answer:

not specific

Explanation:


Related Questions

how to find oxidation number

Answers

The oxidation number of the  atom is the number that will represents the total number of the electrons lost or the gained by it.

The oxidation number of the  atom is the number that will represents the total number of the electrons lost or the gained by it. The free element has an oxidation number that is equal to zero. For the monoatomic ions, the oxidation number will always be has the same value as the charge related  to the ion.

The hydrogen atom (H) will exhibits an oxidation state of the +1. The Oxygen has the oxidation of the -2 in most of the compounds. All the alkali metals that have the oxidation state of the +1 in the alkali compounds.

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What is 6 carbon molecule?

Answers

Benzotriyne is the 6 carbon molecule.

Generally, Benzotriyne or cyclo[6]carbon is described as a hypothetical compound, or an allotrope of carbon with molecular formula C₆. Basically, the molecule is a ring of six carbon atoms, which is connected by alternating triple and single bonds.

It was found from recent investigations that benzotriyne is unlikely to exist due to the presence of large angle strain. A likely alternative isomer of benzotriyne would be a cyclic cumulene known as cyclohexahexaene, which should itself be a metastable species.

Hence, the carbon molecule which contains a total number of 6 carbon atoms is known as Benzotriyne.

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aluminum reacts with excess hydrochloric acid to form aqueous aluminum chloride and of hydrogen gas over water at and . how many grams of aluminum reacted? the partial pressure of water at is . round your answer to significant figures.

Answers

Answer:0.0324

g Al

Explanation:We're asked to find the number of grams of

Al

that reacted, given some

H

2

(

g

)

product characteristics.

Let's first write the chemical equation for this reaction:

2

Al

(

s

)

+

6

HCl

(

a

q

)

2

AlCl

3

(

a

q

)

+

3

H

2

(

g

)

The total pressure of the gaseous system is given as

751

mm Hg

, and the partial pressure of water vapor is

26.8

mm Hg

at

27

o

C

. The pressure of hydrogen gas is thus

P

total

=

P

H

2

O

+

P

H

2

P

H

2

=

751

mm Hg

26.8

mm Hg

=

724

mm Hg

This pressure in atmospheres is

724

mm Hg

(

1

l

atm

760

mm Hg

)

=

0.953

atm

We'll now use the ideal gas equation to find the number of moles of

H

2

formed:

(

T

=

27

o

C

+

273

=

300

K

)

n

=

P

V

R

T

=

(

0.953

atm

)

(

0.0465

L

)

(

0.082057

L

atm

mol

K

)

(

300

K

)

=

0.00180

mol H

2

(volume converted to liters here)

Using the coefficients of the chemical equation, we'll now find the relative number of moles of

Al

that react:

0.00180

mol H

2

(

2

l

mol Al

3

mol H

2

)

=

0.00120

mol Al

Lastly, we'll use the molar mass of aluminum (

26.98

g/mol

) to find the number of grams that reacted:

0.00120

mol Al

(

26.98

l

g Al

1

mol Al

)

=

0.0324

g Al

Thus,

0.0324

grams of aluminum

reacted.

endoplasmic reticulum definition

Answers

The endoplasmic reticulum (ER) is an organelle found in eukaryotic cells that is responsible for a variety of important cellular functions, including protein synthesis, lipid synthesis, and calcium storage.

The ER is a network of membrane-bound tubes and sacs that extends throughout the cytoplasm of the cell, and it comes in two forms: the rough endoplasmic reticulum (RER) and the smooth endoplasmic reticulum (SER).

The RER is studded with ribosomes, which are responsible for synthesizing proteins. As the proteins are synthesized, they are folded and modified in the lumen of the RER, and they may also be transported to other parts of the cell, such as the Golgi apparatus, for further processing.

The SER, on the other hand, lacks ribosomes and is involved in lipid synthesis, carbohydrate metabolism, and detoxification. It also plays a role in the regulation of calcium levels within the cell, by storing and releasing calcium ions as needed.

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--The given question is incorrect, the correct question is

"Define endoplasmic reticulum"--

What is NaCI as a compound?

Answers

NaCl is the chemical formula for sodium chloride, commonly known as table salt. It is a compound made up of two elements, sodium (Na) and chlorine (Cl), that are chemically bonded together in a fixed ratio of 1:1.

The sodium and chlorine atoms in NaCl are held together by an ionic bond, which is a type of chemical bond formed between two oppositely charged ions. In this case, sodium loses one electron to become a positively charged ion (Na+), and chlorine gains one electron to become a negatively charged ion (Cl-).

The resulting Na+ and Cl- ions attract each other electrostatically to form a crystal lattice structure, which gives sodium chloride its characteristic salty taste and other physical and chemical properties.

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how many atoms in volume of 30 ml H20

Answers

Answer: 3.012x10^24

Explanation:

1.004x10^23 atoms are in 1 mL of water.

multiply 1.004x10^23 by 30

Paint evidence helped solve the case of the Green River Killer because investigators had:
A. high-tech investigative tools at their disposal.
B.a known suspect to gather evidence from.
C.a definitive match in the paint data query.
D.additional corroboration from other trace evidence.

Answers

Paint evidence helped investigatοrs sοlve the Green River Killer case because the paint data query yielded a definitive match. Thus, οptiοn C is cοrrect.

What is the identity οf the Green River Killer?  

Gary Leοn Ridgway's victims were primarily sex wοrkers and οther vulnerable wοmen, including underage runaways. The press gave him his nickname after the first five victims were discοvered in the Green River befοre his identity was revealed.

He strangled his victims, usually with his hands but sοmetimes with ligatures. He wοuld strangle them and then dump their bοdies in King Cοunty's fοrested and vergrwn areas, frequently returning tο the bοdies tο have sexual encοunters with them.

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what is hcl a strong acid?

Answers

HCL is a strong acid because it dissociates completely. An acid is said to be strong acid if it ionizes completely in the solution.

Acids are called as strong acids if that completely dissociate into their ions in water. That means in a solution all of their molecules break up. These acids yield at least one hydrogen cation (H+) per molecule. Weak acids will dissociate less than 1% that means very few of their molecules will break up to release a hydrogen ion. Strong acids will have large values for dissociation constant while weak acids will have very small values for dissociation constant. Strong acids are very corrosive such as hydrochloric acid and sulfuric acid. Weak acids can also be extremely corrosive such as hydrofluoric acid which can decalcify bone.

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The correct question is,

Is HCL is a strong acid?

a sealed vessel contains 4.0 g of nitrogen and 6.0 g of helium at 300 k. the total pressure in the vessel is 150 kpa. what is the partial pressure in kpa of nitrogen?

Answers

The partial pressure of nitrogen in the vessel is 13.0 kPa.

What is partial pressure?

In the study of gases, the term "partial pressure" refers to the pressure that a single gas would experience if it were to occupy the same volume as the complete mixture. The quantity of a gas's molecules in a mixture directly relates to its partial pressure. The total pressure in a gas mixture is the sum of the partial pressures of the individual gases. By multiplying the mole fraction of the gas in the mixture by the combination's total pressure, it is possible to get the partial pressure of a gas. Chemistry, physics, and engineering all use the idea of partial pressure extensively. Understanding the behavior of gases in numerous chemical and physical processes, such as gas exchange in the lungs and gas solubility in liquids, requires an understanding of partial pressure.

To find the partial pressure of nitrogen in the vessel, we need to use the mole fraction of nitrogen and the total pressure of the mixture.

moles of nitrogen = mass of nitrogen / molar mass of nitrogen = 4.0 g / 28.0134 g/mol = 0.1425 mol

moles of helium = mass of helium / molar mass of helium = 6.0 g / 4.0026 g/mol = 1.499 mol

The total number of moles of gas in the vessel is:

total moles = moles of nitrogen + moles of helium = 0.1425 mol + 1.499 mol = 1.6415 mol

The mole fraction of nitrogen is:

mole fraction of nitrogen = moles of nitrogen / total moles = 0.1425 mol / 1.6415 mol = 0.0868

The partial pressure of nitrogen is:

partial pressure of nitrogen = mole fraction of nitrogen x total pressure = 0.0868 x 150 kPa = 13.0 kPa

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A chef finds a sealed container consisting of an ingredient that goes into his restaurant’s secret sauce. The ingredient’s molecules are moving in place. What will happen if the chef causes the ingredient to change phase by transferring energy into it?
After the phase change, the ingredient’s molecules will move . . .
a. faster, and the ingredient will be a solid.
b. faster, and the ingredient will be a liquid.
c. slower, and the ingredient will be a solid.
d. slower, and the ingredient will be a liquid.

Answers

A chef finds a sealed container consisting of an ingredient that goes into his restaurant's secret sauce. After the phase change, the ingredient molecules will move faster, and the ingredient will be a liquid.

The molecules of the item will move more quickly if the chef applies energy to the sealed container, causing the ingredient to transform from a solid to a liquid. This is so that the molecules may move about more freely when the energy input breaks the intermolecular connections that keep the component in a solid form. The molecules of solid substance will accumulate kinetic energy as the temperature rises, causing them to vibrate more fiercely in place.

The molecules will lose their intermolecular connections once the temperature hits the melting point, changing the ingredient's phase from a solid to a liquid. The constituent molecules move more freely in the liquid phase than they could in solid phase, but they will still be relatively close to one another and exhibit some intermolecular interaction. The temperature of the liquid will affect how quickly the molecules travel, with greater temperatures making this happen.

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what steps are necessary for finishing up a spectrophotometry experiment?

Answers

Finishing up a spectrophotometry experiment requires careful attention to detail, as well as knowledge of laboratory safety and experimental protocols. Proper documentation and analysis of the results can help ensure that the experiment is reproducible and the conclusions are valid.

What is spectrophotometry ?

Spectrophotometry is a technique used to measure the intensity of light absorbed or transmitted by a sample as a function of wavelength. It is commonly used in chemistry, biochemistry, and molecular biology to measure the concentration of a substance in a solution, based on the amount of light that is absorbed by the sample.

Finishing up a spectrophotometry experiment typically involves several steps, which may include:

Collecting data: Once the experiment is complete, the data from the spectrophotometer should be collected and recorded.

Analyzing the data: The data collected from the experiment should be analyzed to determine the absorbance values of the samples and standards, and to calculate the concentration of the unknown samples.

Cleaning the spectrophotometer: The spectrophotometer should be properly cleaned and maintained to ensure accurate results in future experiments.

Disposing of samples: Any unused samples or solutions should be disposed of properly, in accordance with laboratory safety guidelines and local regulations.

Recording results: The results of the experiment should be recorded in a laboratory notebook or other appropriate documentation, including the concentrations of the unknown samples and any other relevant data.

Drawing conclusions: Based on the results of the experiment, conclusions should be drawn and any further experiments or investigations should be planned.

Presenting the results: If the experiment is part of a larger research project, the results may be presented in a scientific paper, poster, or presentation.

Overall, finishing up a spectrophotometry experiment requires careful attention to detail, as well as knowledge of laboratory safety and experimental protocols. Proper documentation and analysis of the results can help ensure that the experiment is reproducible and the conclusions are valid.

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At which of the above boundaries is sea floor created?

Answers

At divergent plate boundaries the sea floor is created.

What are divergent plate boundaries?

Divergent boundaries, also called divergent plate boundaries, are linear structures that exist between two moving tectonic plates.

Diverging continental boundaries create rifts that eventually become rift valleys. Most active diverging plate boundaries are found as mid-ocean ridges between oceanic plates.

When the edge of a dense plate slides down a slope, the pressure and temperature around it increases, creating a plate drift that melts the overlying mantle, causing molten rock to rise through the plate.

A volcano is a feature of the Earth's crust where molten rock is pushed to the surface. When this lava is below the surface, it is called magma, and when it erupts, it is called lava.

As the dense plate edge moves downhill, the pressure and temperature around it rises, causing changes in the plate and melting the overlying mantle. Molten rock can rise through the plate and reach the surface of the plate as part of a volcano.

Main Types of Volcanoes:

Volcanoes come in many shapes and sizes, but they share some key characteristics. All volcanoes are connected to reservoirs of lava known as subterranean magma chambers.

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At diverging boundries , seafloor spreading takes place. The mantle's convection currents generate heat that makes the crust more flexible and less thick when tectonic plates slowly drift apart from one another.

Why is diverging boundries ?

Diverging plate boundries are linear formations that occur between two moving plate tectonics. They are also known as divergent plate boundaries. Rifts are formed by diverging continental boundaries and eventually develop into rift valleys. Mid-ocean ridges between oceanic crust are where the majority of active divergent plate boundaries may be located.

Which two forms of diverging boundries are there?

Lithospheric plates move apart at divergent borders, also known as constructive barriers. Continental rift zones & mid-ocean ridges are the two main forms of divergent boundaries, according to the location of their occurrence.rized by where they occur: continental rift zones and mid-ocean ridges.

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How do you find the pH of acetic acid?

Answers

To find the pH of acetic acid, you need to know its concentration and dissociation constant.

Acetic acid is a weak acid, so it does not completely dissociate in water. Its dissociation constant is denoted by Ka and is equal to 1.8 x 10^-5 at 25°C. The pH of acetic acid can be calculated using the following formula:

pH = pKa + log([A-]/[HA])

where pKa is the negative logarithm of the dissociation constant, [A-] is the concentration of the acetate ion, and [HA] is the concentration of undissociated acetic acid.

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determine the formula of the hydrated sulfate. the number of water molecules is usually a small whole number expressed as an integer before h2o in the formula. show calculations and use correct significant figures.

Answers

The formula of the hydrated sulfate for Epsom salt is MgSO₄.5H₂O. The number of water molecules in this hydrated sulfate formula is equal to 5.

A hydrate is a compound containing a specific mass of water in the form of H₂O. To determine the molecular formula of the hydrate,[anhydrous solid⋅xH₂O.

], moles of water per mole of anhydrous solid (x). Step of the hydrate formula :

determines the mass of water released from the compound. This is accomplished by subtracting the weight of the anhydrate from the weight of the hydrate. Converts the weight of water to moles. To do this, divide the mass of water by the molar mass of water to get the number of moles of water. Converts the mass of residual anhydrous into moles.Determines the molar ratio of water to anhydrous. Write formulas using molar ratios.

Considering a 210.4 g sample of Epsom salt hydrate, heating MgSO₄.xH₂O. releases water, so the mass of the resulting anhydrate is 120.4 g. What is the molecular formula of this hydrated sulfate?

Determine the mass (in grams) of water leaving the compound.

= 210.4 g MgSO₄.H₂O. - 120.4 g MgSO₄

= 90 g H2O.

Convert the weight of water to moles:

= 90 g H₂O/ (18 g/mol H₂O) = 5 mol H₂O.

Convert the mass of the remaining anhydrous to moles:

= 120.4 g MgSO₄ /(120.4 g/mol MgSO₄ ) = 1 mol MgSO₄.

Determine the molar ratio of water to anhydrous compound:

= 5 mol H₂O /1 mol MgSO₄ = 5:1.

Since there are 5 moles of H₂O for every mole of MgSO₄, the molecular formula is MgSO₄.5H₂O. There are therefore 5 molecules of water in the formula of hydrated sulphate.

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Complete question:

determine the formula of the hydrated sulfate for Epsom salt, MgSO₄ nH₂O, the number of water molecules is usually a small whole number expressed as an integer before h2o in the formula. show calculations and use correct significant figures.

how are ion channels and ion pumps different?

Answers

The main differences between ion channels and ion pumps are that ion channels allow ions to passively move across the membrane and are typically regulated by external stimuli, while ion pumps actively transport ions across the membrane using energy and are not directly regulated by external stimuli.

Ion channels and ion pumps are both involved in the movement of ions across cell membranes, but they operate through different mechanisms and have different functions.

Ion channels are protein structures that allow ions to move across cell membranes by creating a pore or channel through which they can pass. Ion channels are typically highly selective, allowing only certain types of ions to pass through. Ion channels can be gated, meaning that they can be opened or closed in response to various stimuli, including changes in membrane potential, binding of ligands, or mechanical stress. Ion channels are important for the rapid movement of ions across the membrane, which is necessary for processes such as nerve signaling, muscle contraction, and the secretion of hormones and neurotransmitters.

In contrast, ion pumps are membrane proteins that actively transport ions across the membrane using energy in the form of ATP hydrolysis. Ion pumps are highly selective and can transport ions against their concentration gradients. One example of an ion pump is the sodium-potassium pump, which transports three sodium ions out of the cell and two potassium ions into the cell for every ATP molecule hydrolyzed. Ion pumps are important for maintaining ion concentrations inside and outside the cell, and for regulating cell volume.

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what makes a solvent ideal for use in a recrystallization?

Answers

The solvent ideal for the use in the recrystallization is the one in which   product will be the very soluble at the high temperatures but the only slightly soluble at the room temperature or lower.

The Recrystallization process is the technique that is used to purify the solid compounds. The Solids tend to be the more soluble in the hot liquids than in the cold liquids. During the process of the recrystallization, an impure solid compound will be dissolved in the hot liquid until the solution become saturated, and then the liquid is allowed to be cool.

The ideal solvent for crystallization of the particular compound is one in which product will be the very soluble at the high temperatures .  The primary consideration is that  solvent should be unreactive.

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as the concentration of ferrous iron decreases your sample absorbs _______ light, therefore ______ light reaches the detector.

Answers

As the concentration of ferrous iron decreases, your sample absorbs less light, therefore more light reaches the detector.

What happens when a sample containing ferrous iron is exposed to light?

When a sample containing ferrous iron is exposed to light at a specific wavelength, some of the light is absorbed by the ferrous iron molecules in the sample. This results in a decrease in the intensity of the light that reaches the detector, which is measured as the absorbance of the sample.

The amount of light absorbed by the ferrous iron molecules is directly proportional to their concentration in the sample. Therefore, if the concentration of ferrous iron in the sample decreases, there are fewer molecules to absorb the light, and more light reaches the detector. This results in a lower absorbance reading for the sample.

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The study of the relationship between heat and work within chemical reactions or physical changes of state is called chemical ________________.
a. reactions
b. chemistry
c. thermodynamics
d. changes

Answers

The study of the relationship between heat and work in a chemical reaction or change of physical state is called chemical thermodynamics. So, option C is correct.

The study of how heat and work interact with chemical reactions or physical state changes within the parameters of the laws of thermodynamics is called chemical thermodynamics.

Thermochemistry is the class of chemical reactions that result from the absorption and release of heat, while thermodynamics describes the rate at which heat flows.

The laws of thermodynamics explain how energy develops in a system and whether a system can use its surroundings to produce productive work. Hence, option C is correct.

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How might a potter use chemistry?
OA. Chemistry can help a potter understand how the speed of a
pottery wheel affects the height of the pot.
OB. Chemistry can help a potter design a perfectly symmetrical pot.
OC. Chemistry can help a potter find new customers to buy his or her
products.
OD. Chemistry can help a potter mix glazes to get the desired colors.

Answers

A potter can use chemistry to better understand how a pottery wheel speed impacts the pot's height. OB. A potter's design can benefit from chemistry.

Describe a design?

Several verbal and nounal senses of the word "design" exist. Design refers to the process of outlining a project's final form and functionality through the use of sketches. For instance, before building a new bridge, the government will hire a team to design it. Humans have been proven to develop an immediate thought within a few seconds, but once that impression has matured, it can take much longer to change that perception.

What exactly is chemistry?

Chemistry is the area of science that focuses.

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Which of these examples represents a system at equilibrium?
These fish swim under a plant and five other fish come out from the plant
In a sealed flask, 500 water molecules vaporize while 500 other water molecules condense
A chef puts two pizzas into the oven and takes five pizzas out

Answers

Examples that represents a system at equilibrium are : These fish swim under a plant and five other fish come out from plant; In a sealed flask, 500 water molecules vaporize while 500 other water molecules condense.

What is meant by equilibrium?

Condition in the course of reversible chemical reaction in which no net change in the amounts of reactants and products occurs is called chemical equilibrium.

Chemical equilibrium is the state when both the reactants and products are present in the concentrations which have no further tendency to change with time, so that there is no observable change in properties of system.

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T/F. the branch of chemistry that studies changes is called thermodynamics.

Answers

The branch which deals with the physical changes of substances is called physical chemistry. Thermodynamics is the branch of chemistry that deals with the heat changes in the substance. Hence, the statement is false.

What is thermodynamics ?

Thermodynamics is a branch of chemistry that deals with the heat changes of a system. Thermos means temperature and dynamics means changes. It includes the enthalpy, entropy,  Gibbs energy, internal energy, work done etc.

Physical chemistry, biochemistry, chemical engineering, mechanical engineering, and other complicated subjects like meteorology are just a few of the topics in science and engineering where thermodynamics is relevant.

The study of chemical compounds and chemical reactions swiftly followed the initial application of thermodynamics to mechanical heat engines.

The majority of the advancement and understanding in the discipline has come from the study of chemical thermodynamics, which examines the nature of the function of entropy in the course of chemical reactions.  Hence, the statement is incorrect.

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______ The aggregation of nonpolar molecules or groups in water is thermodynamically favorable due to theA. increased entropy of the water molecules.B. decreased enthalpy of the system.C. increased entropy of the nonpolar molecules when they associate.D. very strong van der Waals forces among the nonpolar molecules or groups.What is the pH of an acetate/acetic acid solution (pKa= 4.7) in which acetic acid is 80% in its deprotonated form?

Answers

The aggregation of nonpolar molecules or groups in water is thermodynamically favorable due to the increased entropy of the nonpolar molecules when they associate. The pH of the acetate/acetic acid solution is 5.3. Option C is correct.

The nonpolar molecules tend to minimize their contact with water molecules, which increases the overall disorder or entropy of the system.

To calculate the pH of an acetate/acetic acid solution with a pKa of 4.7 and in which acetic acid is 80% in its deprotonated form, we can use the Henderson-Hasselbalch equation:

pH = pKa + log([A⁻]/[HA])

where [A⁻] is the concentration of the acetate ion and [HA] is the concentration of acetic acid.

We know that the solution is 80% in its deprotonated form, which means that [A⁻]/[HA] = 4/1 (since there are 4 deprotonated acetate ions for every 1 protonated acetic acid molecule).

Substituting the values into the equation, we get:

pH = 4.7 + log(4/1) = 4.7 + 0.6 = 5.3

Hence, C.  increased entropy of the nonpolar molecules when they associate is the correct option.

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when a utensil is stored in water between uses, what are the requirements? answer choices A. running water at any temperature, or a container of water at 70 degrees F or lower B. running water at any temperature, or a container of water at 135 degrees F of higherC. running water at 70 degrees F or lower, or a container of water at 70 degrees F or lower D. running water at 135 degrees F or higher, or a container of water at 135 degrees F or higher

Answers

When a utensil is stored in water between uses, the requirements are running water at 135 degrees F or higher, or a container of water at 135 degrees F or higher. So, correct answer is option (D).

A safe food that require controlled time and temperature is known as TCS food, include milk and dairy products, eggs, and meat (beef, pork, lamb). The

utensil should be placed over the rim of the container with the handle facing up. Plates without TCS can be placed on clean, sanitized surfaces that come in contact with food. Some spoons or ladles can be kept under running water. Periodically store used tools in a container of water maintained at 135 degree F (57°C) or higher and clean tools and containers at least every 24 hours or as often as necessary to prevent dirt build-up.

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What are the 4 rules for naming ionic compounds?

Answers

The four rules for naming ionic compounds are: 1) write the name of the cation, 2) write the name of the anion, 3) combine the names and 4) use roman numerals to indicate the charge of the cation if it is a transition metal.

The cation (positive ion) is named first, followed by the anion (negative ion).

The name of the cation is the same as the element from which it is derived. If the element can form cations with different charges, the charge is indicated using Roman numerals in parentheses after the element name.

The name of the anion is derived from the name of the element, with the ending changed to "-ide".

If the compound contains a polyatomic ion (a group of atoms with a net charge), the name of the ion is used in the compound name.

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Wool does not hold electrons as tightly as rubber, so when a wool sweater and a rubber balloon are rubbed together, electrons transfer from the (sweater/balloon) to the (sweater/balloon).

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When a wool sweater and a rubber balloon are rubbed together, their surfaces come into contact and the friction causes electrons to be transferred from one surface to the other.

Wool does not hold onto electrons as tightly as rubber, so electrons transfer from the sweater to the balloon. This results in the sweater becoming positively charged and the balloon becoming negatively charged. This transfer of electrons is known as static electricity, which can create a spark or shock when discharged. The strength of the static electricity generated depends on the materials involved, their surface area, and the amount of friction applied.

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A reaction has a rate constant of 1.23×10−4 s−1 at 26 ∘C and 0.232 s−1 at 79 ∘C .
Part A
Determine the activation barrier for the reaction.
Express your answer in units of kilojoules per mole.
Part B
What is the value of the rate constant at 18 ∘C ?
Express your answer in units of inverse seconds.

Answers

The rate constant at 18°C is approximately 4.36×10^-5 s^-1. The activation energy determines the rate of a reaction, as reactions with higher activation energies require more energy and therefore occur more slowly than reactions with lower activation energies.

What is Activation Energy?

It is the energy required for reactant molecules to collide with enough force to overcome the energy barrier and form products.

To determine the activation energy of the reaction, we can use the Arrhenius equation:

k = A e^(-Ea/RT)

where k is the rate constant, A is the pre-exponential factor, Ea is the activation energy, R is the gas constant (8.314 J/mol·K), and T is the temperature in Kelvin.

We can use the given rate constants and temperatures to set up two equations and solve for the activation energy:

k1 = A e^(-Ea/RT1)

k2 = A e^(-Ea/RT2)

Taking the ratio of the two equations eliminates the pre-exponential factor:

k2/k1 = e^(Ea/R (1/T1 - 1/T2))

Substituting in the given values:

k2/k1 = 0.232 s^-1 / 1.23×10^-4 s^-1 = 1886.2

T1 = 26 + 273.15 = 299.15 K

T2 = 79 + 273.15 = 352.15 K

Solving for Ea:

ln(k2/k1) = (-Ea/R) (1/T1 - 1/T2)

Ea = -R ln(k2/k1) / (1/T1 - 1/T2)

Ea = -8.314 J/mol·K * ln(1886.2) / (1/299.15 K - 1/352.15 K)

Ea ≈ 90.7 kJ/mol

Therefore, the activation energy of the reaction is approximately 90.7 kJ/mol.

To find the rate constant at 18°C, we can use the same Arrhenius equation:

k = A e^(-Ea/RT)

Rearranging the equation and solving for k:

k = A e^(-Ea/RT) = k1 e^(Ea/R (1/T1 - 1/T))

Substituting in the given values:

k1 = 1.23×10^-4 s^-1

R = 8.314 J/mol·K

T1 = 26 + 273.15 = 299.15 K

T = 18 + 273.15 = 291.15 K

k = 1.23×10^-4 s^-1 * e^(90.7 kJ/mol / (8.314 J/mol·K * (1/299.15 K - 1/291.15 K)))

k ≈ 4.36×10^-5 s^-1

Therefore, the rate constant at 18°C is approximately 4.36×10^-5 s^-1.


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The positive control for the Iodine test was the
A. Glucose solution.
B. Olive oil.
C. Albumin solution.
D. Starch solution.
E. Distilled water.

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The positive control for the Iodine test was the Starch solution. The correct option is D.

In the iodine test , the negative control is the distilled water. The positive control is the starch solution. The iodine test is used to test for the starch.  It interacts with the coiled molecules and it becomes the bluish - blackish color. The yellow color is the negative test for the starch.  The iodine - starch test is the chemical reaction that is used for the test for the presence of the starch or for the iodine.

Thus, the starch solution is the positive control for the iodine test.

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why do you think the production of wool in decreasing in india

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Outdated and inadequate pre- and post-loom processing facilities. Ineffective role of state wool marketing organizations. Lack of a Minimum Support Price (MSP) system. No educational institute for wool technology.

What is an organization?

Sociology can be summed up as the study of modernity's institutions; certain institutions have a purpose, much like the individual organs in a well-functioning body. An "organisation" may be more broadly defined in the social and political sciences as the planned, coordinated, and intentional behaviour of people acting together to accomplish a common objective or create a physical object. Often, official membership and form frame this action (institutional rules). Organizations can be classified in sociology as planned formal organisations or unplanned informal (i.e., impromptu) groups. Sociology examines organisations first and foremost from an institutional angle. In this regard, the organisation is a stable combination of components. Rules govern these components' behaviour, ensuring that.

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Describe three ways in which compounds and mixtures differ.

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Compounds have fixed composition, properties and are chemically bonded while mixtures have variable composition, properties and are physically mixed.

Mixtures and combinations are two distinct sorts of substances. Compounds are unadulterated substances made out of at least two components synthetically reinforced together in a decent proportion, while blends are blends of at least two substances that are truly blended yet not artificially consolidated. Three manners by which mixtures and combinations vary are:

Piece: Mixtures have a proper creation and a particular proportion of molecules or particles, while blends have a variable synthesis with no particular proportion.

Properties: Mixtures have unmistakable properties, like a particular dissolving point, edge of boiling over, and compound reactivity, while blends have a scope of properties that rely upon the substances in the combination.

Detachment: Mixtures must be isolated by substance implies, like through a compound response, while blends can be isolated by actual means, like filtration, refining, or chromatography.

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The first-order decomposition of N2O5 at 328 K has a rate constant of 1.70 . 10-3 s-1. If the initial concentration of N2O5 is 2.88 M, what is the concentration of N2O5 after 12.5 minutes?

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The concentration of N2O5 after 12.5 minutes is 1.094 M.The rate law for a first-order reaction is given by:

Rate = k[A]

where k is the rate constant and [A] is the concentration of the reactant.

The integrated rate law for a first-order reaction is given by:

ln[A]t = -kt + ln[A]0

where [A]t is the concentration of the reactant at time t, [A]0 is the initial concentration, k is the rate constant, and ln is the natural logarithm.

Using the given rate constant and initial concentration of N2O5, we can calculate the concentration of N2O5 after 12.5 minutes as follows:

ln([N2O5]t/[N2O5]0) = -kt

ln([N2O5]t/2.88 M) = -(1.70 x 10^-3 s^-1)(12.5 min)(60 s/min)

ln([N2O5]t/2.88 M) = -1.530

[N2O5]t/2.88 M = e^-1.530

[N2O5]t = (e^-1.530)(2.88 M)

[N2O5]t = 1.094 M

Therefore, the concentration of N2O5 after 12.5 minutes is 1.094 M.

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