Elements on the transition metal has the highest tendency to gain are chromium and manganese.
Transition metals typically have the ability to lose electrons to form positive ions, rather than to gain electrons to form negative ions. However, some transition metals can gain electrons under certain conditions.
The tendency to gain electrons (electron affinity) generally increases across a period from left to right on the periodic table, and decreases down a group from top to bottom.
Among the transition metals, the element with the highest electron affinity is usually considered to be either chromium [Cr] or manganese [Mn]. Both of these elements have a relatively high electron affinity due to their electronic configurations and the proximity of their valence electrons to the nucleus.
However, it is important to note that electron affinity values can vary depending on the specific experimental conditions used to measure them.
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The elements on the transition metal that have the highest tendency to gain are chromium and manganese.
Usually, transition metals form positive ions by losing electrons rather than gaining electrons to form negative ions. However, under certain conditions, some transition metals can gain electrons. The tendency to gain electrons is known as electron affinity.
This tendency generally increases as we go across a period from left to right in our periodic table and decreases while going down the group from top to bottom.
The element with the highest electron affinity, among the transition metals, is usually considered to be either manganese [Mn] or chromium [Cr]. Both of them have a relatively high electron affinity because of their electronic configurations and the proximity of their valence electrons to the nucleus.
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Identify the differences in composition properties
Answer:
The composition and properties of a substance are different from each other.
The composition of a substance is what he substance is made of.
Let's take water as an example. We know that the chemical formula for water is . This tells us that water has 2 hydrogen molecules and 1 oxygen molecule. That is the composition of water.
The properties of a substance are how a substance appears and behaves both chemically and physically.
Again, let's use water as an example. Most times, water is a clear liquid. It freezes at 0 degrees Celsius and boils at 100 degrees Celsius. These are some of water's physical properties. Water also has many chemical properties; however, we needn't go into those.
Explanation:
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why is glucose a macromolecule?
Answer:
Sugar
Explanation:
Glucose is a carbohydrate. Carbohydrates are mainly used for quick energy inside cells, but they also play an important role in cell structure and communication. Carbohydrates are macromolecules called polysaccharides, meaning they are made of many sugars.
25.
A 500.0-gram sample of copper is initially at 25 °C. It absorbs 6.30 kJ of heat from its surroundings. What is
its final temperature, in °C? (Specific heat = 0.385 J/g °C for copper)
57.7 °C
41.4 °C
7.72 °C
65.7 °C
29 9 °C
The final temperature with Specific heat = 0.385 J/g °C for copper is 57.7 °C.
What is Specific heat?Specific heat is a measure of the amount of heat energy required to raise the temperature of a unit mass of a substance. It is a physical property of a material and is usually measured in units of J/(g °C) or J/(g K).
Equation:q = m * c * ΔT
where q is the heat absorbed (in joules), m is the mass of the substance (in grams), c is the specific heat (in J/(g °C)), and ΔT is the change in temperature (in °C).
Plugging in the values,
6.30 kJ = 500.0 g * 0.385 J/(g °C) * ΔT
Simplifying the equation, we get:
ΔT = (6.30 kJ) / (500.0 g * 0.385 J/(g °C))
ΔT = 32.7 °C
The final temperature of the copper is as follows:
25 °C + 32.7 °C = 57.7 °C
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Find reaction type and products for each equation please. FIRST CORRECT ANSWERS GETS BRAINLIEST HELP!!!
Reactant: C3H8 + O2 = Product: CO2 + H2O
Reactant: Zn + HCI = Product: ZnCl₂
Reactant: KI + Pb(NO3)2 = Product: KNO3 and PbI2
Reactant: Mg(CIO3)2 = Product: MgCl2 and O2
Reactant: F2 + KBr = Product: KF and Br2
What are chemical reactions?Chemical reactions entail the conversion of one or more substances into novel species, thanks to the breaking and forging of chemical bonds.
Essentially, such transformations involve the reconfiguration of atoms and/or molecules, culminating in distinct chemical and physical attributes contrasting from those of the initial materials.
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Mangrove trees grow in swampy areas and have strong roots that hold the soil in place. How is this helpful for the environment?
a
They absorb water from the soil.
b
They overtake the environment.
c
They provide wood for humans.
d
They protect the land from eroding
Mangrove trees' robust roots aid in stabilizing the soil and preventing soil erosion. This is especially crucial in swampy coastal locations, where the soil is frequently loose and prone to wind and wave erosion. Mangrove trees work to stabilize the coastline and stop land erosion by securing the soil in place.
Mangrove trees also aid in removing contaminants from the water, enhancing the quality of the water in coastal areas while serving as an essential home for a variety of wildlife species. Mangrove trees contribute significantly to environmental protection and are an essential component of coastal ecosystems.
Mangrove trees are crucial for environmental preservation because they hold the soil in place and stop erosion in marshy coastal areas. They also provide crucial habitats for numerous wildlife species, stabilize the coastline, and stop the land from being lost to erosion while enhancing water quality by filtering pollutants from the ocean.
Mangrove trees are an essential part of coastal ecosystems overall, and preserving them is essential for preserving a healthy and sustainable environment.
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10. How many moles are in 20 grams of Carbon (12 amu)?
11. How many moles are in 2.9 grams of Lithium (7 amu)?
12. How many moles are in 0.001 grams of Chlorine (35 amu)?
13. How many grams are in 10 moles of Beryllium (9 amu)?
14. How many grams are in 3.4 moles of Nitrogen (14 amu)?
15. How many grams are in 1.5 moles of Hydrogen (1 amu)?
16. How many atoms are in 10 moles of Helium?
17. How many atoms are in 0.003 moles of Neon?
18. How many atoms are in 2.7 moles of Sodium?
19. How many atoms are in 3.0 grams of Boron (9 amu)?
20. How many atoms are in 5.6 grams of Nitrogen?
i need help please for all of them
V
A student dissolves 11.S g of sodium hydroxide (NaOH) in 250. g of water in a well-insulated open cup. He then observes the temperature of the water rise
from 20.0 °C to 31.3 °C over the course of 6.7 minutes.
Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction:
NaOH(s) -. Na (ag) + OH (ag)
You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to 3
significant digits.
Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and
published values for this reaction.
is this reaction exothermic, endothermic, or neither?
Oexothermic
O endothermic
O neither
0.°
If you said the reaction was exothermic or endothermic, calculate the amount of
heat that was released or absorbed by the reaction in this case.
Calculate the reaction enthalpy AH.
nen per mole of NaOH.
kJ
According to the question the reaction enthalpy is thus 10610 J / 0.278 moles = 38.3 kJ/mol.
What is enthalpy?Enthalpy is a thermodynamic property of a system that measures the total energy content of a system. It is a state function that is expressed in terms of internal energy, pressure, and volume of a system. Enthalpy represents the amount of energy that is associated with a chemical reaction or physical change.
The reaction is exothermic, meaning that heat is released during the reaction. The amount of heat released can be calculated with the equation q = mcΔT, where q is the heat released, m is the mass of the solution, c is the specific heat capacity of the solution, and ΔT is the change in temperature of the solution. Using the given data, the amount of heat released by the reaction can be calculated as q = (250 g)(4.184 J/g-K)(11.1 K) = 10610 J. The enthalpy change for the reaction can then be calculated by dividing the heat released by the number of moles of NaOH, which is 11.1 g / 40.00 g/mol = 0.278 moles. The reaction enthalpy is thus 10610 J / 0.278 moles = 38.3 kJ/mol.
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4. Pipettes used for the transfer of samples of solutions are always rinsed with a small portion of the solution before the actual sample is taken. Calculate the percent error likely to arise in an experiment if 5-mL, 10-mL, and 25-mL pipettes are used for transfer and each pipette contains 5 drops of water adhering to the inside of the barrel. A single drop of water has a volume of approximately 0.05 mL.
The experiment employing these pipettes would most likely have a 5% error rate.
We use percent error because?When your estimate aims at a known, accurate figure, percent error is a useful metric. Use it to measure how near an estimate is to the actual value, in general. When an approximation value is near to the true value, there are fewer mistakes.
What does percent error for percentages mean?The percent error is the distinction between the estimated value and the actual value in relation to the actual value. In other words, the relative error is multiplied by 100 to calculate the percent error.
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For the first order question
N2O5(g)》2NO2(g)+1÷2O2(g)
t1÷2=22.5 h at 20°C and 1.5 h at 40°C
a) calculate the activation energy of this reaction
b) if the arrhenius constant A=2.05×10^13 s^-1 determine the value of k at 30°C
This reaction has an activation energy of about 81.6 kJ/mol.
At 30 °C, the value of k is roughly 1.10 × 10¹³ s⁻¹.
How to determine activation energy and constant?a) To calculate the activation energy, use the Arrhenius equation:
k = A × e^(-Ea/RT)
where k = rate constant, A = pre-exponential factor, Ea = activation energy, R = gas constant, and T = temperature in Kelvin.
Use the given half-lives to calculate the rate constants at each temperature:
k₁ = 0.693 / t₁/2 = 0.693 / 22.5 = 0.0308 h⁻¹ at 20°C
k₂ = 0.693 / t₁/2 = 0.693 / 1.5 = 0.462 h⁻¹ at 40°C
Converting the temperatures to Kelvin:
T1 = 20°C + 273.15 = 293.15 K
T2 = 40°C + 273.15 = 313.15 K
Now use the Arrhenius equation to calculate the activation energy:
ln(k1/k2) = (Ea/R) × (1/T₂ - 1/T₁)
ln(0.0308/0.462) = (Ea/8.314) × (1/313.15 - 1/293.15)
-3.31 = (Ea/8.314) × (0.003386)
Ea = -3.31 × 8.314 / 0.003386 = 81570 J/mol
Therefore, the activation energy for this reaction is approximately 81.6 kJ/mol.
b) Use the Arrhenius equation again, with the given activation energy, A, and the new temperature (30°C = 303.15 K) to solve for k:
ln(k) = ln(A) - (Ea/R) × (1/T)
ln(k) = ln(2.05×10¹³) - (81570 / 8.314) × (1/303.15)
ln(k) = 31.87
k = e^(31.87) = 1.10 × 10¹³ s⁻¹
Therefore, the value of k at 30°C is approximately 1.10 × 10¹³ s⁻¹.
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Question 1
This diagram shows Earth in four different positions during its yearly orbit around the sun. Which of the following accurately describes the position of the United States during the summer months?
Question 2
The diagram models 4 lunar phases. During which one is the tide the highest?
Question 3
An HR Diagram is shown below. A star that has a luminosity of 10^-2 is likely a…
Question 4
Earth's atmosphere blocks short wavelengths of the electromagnetic spectrum. Which telescopes DO NOT need to be placed in orbit around Earth to observe short-length radiation?
Question 5
A student models the relationship between the Earth and the Sun using string and a ball. Which of the following explains the relationship demonstrated?
Answer 1:
During the summer months in the northern hemisphere (where the United States is located), Earth is in position C, which is when the northern hemisphere is tilted towards the sun.
Answer 2:
The highest tide occurs during the full moon phase, which is represented by position C in the diagram.
Answer 3:
A star that has a luminosity of 10^-2 is likely a red dwarf.
Answer 4:
Telescopes that observe short-wavelength radiation, such as X-rays and gamma rays, do not need to be placed in orbit around Earth because these wavelengths are absorbed by the atmosphere. Therefore, telescopes that observe these wavelengths are typically placed in space, outside of Earth's atmosphere.
Answer 5:
The student is likely demonstrating the relationship between the Earth and the Sun's gravitational pull. The ball represents the Sun, and the string represents the gravitational force pulling the Earth towards the Sun. The demonstration shows how the Earth orbits the Sun due to this gravitational force.
What is gravitational force?Gravitational force is described as a force that exists between any two objects in the universe that have mass.
It is the force that causes objects with mass to be attracted to each other. The magnitude of the gravitational force between two objects depends on their masses and the distance between them.
Along with the electromagnetic force, the strong nuclear force, and the weak nuclear force, gravity is one of the four fundamental forces of the universe.
Sir Isaac Newton initially introduced it in his law of universal gravitation, and Albert Einstein later elaborated on it in his theory of general relativity.
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If 100.0 moles of H and 40.0 moles of O, react to produce water, which one is the limiting reactant in the
reaction below?
2 H, (g) + 02 (g) - > 2 H20(g)
If 100.0 moles of H₂ and 40.0 moles of O₂, react to produce water, H₂ one is the limiting reactant.
What is limiting reactant?When a chemical reaction is complete, the limiting reagent—also known as the limiting reactant or limiting agent—is the reactant that has been completely consumed. Since the reaction cannot proceed without this reagent, the amount of product that can be produced is constrained. Excess reagents or excess reactants are any reagents that are present in amounts greater than those necessary to cause a reaction with the limiting reagent.
Since the amount of product produced when the limiting reagent interacts entirely is defined as the theoretical yield, the limiting reagent must be identified in order to calculate the percentage yield of a reaction.
The limiting reactant is H₂ because it is the reactant that controls the amount of product produced. When 100 moles of H₂ and 40 moles of O₂ react, all of the H₂ will have been consumed, but there will still be O₂ left over. This means that the reaction was limited by the H₂ and that is the limiting reactant. The solution can be determined by using the following equation:
n(H₂) = 100.0 moles
n(O₂) = 40.0 moles
n(H₂) / (n(O₂) / 2) = ratio of H₂ to O₂
100.0 moles / (40.0 moles / 2) = 5.0
Since the ratio of H₂ to O₂ is 5.0, this indicates that there is more H₂ than O₂ and therefore H₂ is the limiting reactant in the reaction.
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What mass in grams of tin would be required to completely react with 1.20 L of 0.750 M HBr in the following chemical reaction?
Sn(s) + 4 HBr(aq) → SnBr₄ (aq) + 2 H₂ (g)
26.71 g mass of tin would be required to completely react with 1.20 L of 0.750 M HBr.
What is mass ?
Mass is a measure of the amount of matter in an object or substance. It is often expressed in units of grams (g) or kilograms (kg). Mass is a fundamental property of matter and is different from weight, which is the force exerted on an object by gravity and varies depending on the object's location. Mass can be measured using a balance or scale, and is an important factor in many chemical calculations and experiments, such as determining the amount of reactants needed for a reaction or the concentration of a solution.
First, we need to determine the number of moles of HBr in the solution:
moles of HBr = Molarity x Volume
moles of HBr = 0.750 mol/L x 1.20 L
moles of HBr = 0.900 mol
According to the balanced chemical equation, 1 mole of Sn reacts with 4 moles of HBr to produce 1 mole of SnBr₄. Therefore, the number of moles of Sn required can be calculated as:
moles of Sn = (moles of HBr) / 4
moles of Sn = 0.900 mol / 4
moles of Sn = 0.225 mol
The molar mass of Sn is 118.71 g/mol, so the mass of Sn required can be calculated as:
mass of Sn = moles of Sn x molar mass of Sn
mass of Sn = 0.225 mol x 118.71 g/mol
mass of Sn = 26.71 g
Therefore, 26.71 g of tin would be required to completely react with 1.20 L of 0.750 M HBr.
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Complete question is: 26.71 g mass in grams of tin would be required to completely react with 1.20 L of 0.750 M HBr in the chemical reaction. Sn(s) + 4 HBr(aq) → SnBr₄ (aq) + 2 H₂ (g)
What is 99+49x901/1098
Answer:
139.20856102 this is thee answer
Answer:
139,18
Explanation:
please help, dont understand
According to the question, there are 5.857 x 10¹¹ molecules of C₁₂H₂₂O₁₁ in 205g of sucrose.
What is molecules?Molecules are the building blocks of all matter. They are composed of one or more atoms that are held together by covalent bonds, which are formed when electrons are shared between atoms. Molecules can exist as individual entities, but they often combine with other molecules to form larger structures, such as proteins, carbohydrates, and lipids. Molecules can also be found in all living things, from the smallest bacteria to the largest mammals.
This is calculated by taking the molecular weight of sucrose (342.34 g/mol) and dividing it by 205, the mass of the sucrose. This yields a ratio of 1 mol sucrose/ 1.6943 g sucrose. Multiplying this ratio by 205 yields 342.34 mol sucrose, which when multiplied by Avogadro's Number (6.022 x 10²³ mol) yields 5.857 x 10¹¹ molecules of C₁₂H₂₂O₁₁.
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What is the basic mechanism of immunohistochemistry technique?
Answer:
I hope this helps :)
Explanation:
Immunohistochemistry (IHC) is a powerful technique that exploits the specific binding between an antibody and antigen to detect and localize specific antigens in cells and tissue, most commonly detected and examined with the light microscope.Jan 1, 2020
Water rolls off a duck's back but thoroughly wets a head of human hair. What do these observations reveal about the chemical nature of these two sur- faces?
Explanation:
The observations that water rolls off a duck's back but thoroughly wets a head of human hair reveal that the surfaces of the duck feathers and human hair have different physical and chemical properties.
Duck feathers have a unique structure that helps them repel water. They are coated in a special oil that makes them hydrophobic, or water-repelling. The oil forms a layer on the surface of the feathers that prevents water from penetrating into the feather structure. Additionally, the feather structure is tightly packed and has a lot of surface curvature, which also helps to prevent water from sticking to the feathers. This is why water rolls off a duck's back.
In contrast, human hair does not have a hydrophobic coating, and its surface is relatively smooth. This means that water can easily stick to the surface of human hair and thoroughly wet it.
Overall, these observations reveal that the chemical nature of the surfaces of duck feathers and human hair are different, and that these differences have a significant impact on how they interact with water.
a metal worker used a cutting torch that operated by reacting acetylene gas with oxygen gas, as shown in the unbalanced equation below. balance the following equation for the reaction of acetylene and oxygen, using the smallest whole-number coefficients. (the values are 1,2,3,4,5)
The balanced equation for the reaction of acetylene (C₂H₂) and oxygen (O₂) is; 2 C₂H₂(g) + 5 O₂(g) → 4 CO₂(g) + 2 H₂O(g) + heat
The coefficients in the balanced equation represent the stoichiometric ratio of the reactants and products in the chemical reaction. In this case, 2 molecules of acetylene (C₂H₂) react with 5 molecules of oxygen (O₂) to produce 4 molecules of carbon dioxide (CO₂) and 2 molecules of water (H₂O), along with the release of heat.
The balanced equation shows that the number of atoms of each element is the same on both the sides of the equation, in accordance with the law of conservation of mass.
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Refer to picture for question, all must be answered to be considered for Brainliest!!!
Li₃PO₄ + 3 Zn(NO₃)₂ → 3 LiNO₃ + Zn₃(PO₄)₂. In this balanced equation, one of the products is Zn₃(PO₄)₂. To ensure that the equation is balanced, we need 3 moles of Zn(NO₃)₂ for every 1 mole of Li₃PO₄.
What is product in any given reaction?In a chemical reaction, a product is a substance that is formed as a result of the chemical reaction. It is the end result of a chemical reaction, and it is produced by the rearrangement of atoms and/or ions of the reactants.
In the given equation, we end up with 1 mole of Zn₃(PO₄)₂ for every 3 moles of Zn₃(PO₄)₂. This means that the molar ratio of Zn₃(PO₄)₂ to Zn₃(PO₄)₂ is 1:3, indicating that we need three times as much Zn₃(PO₄)₂ as Zn₃(PO₄)₂ to balance the equation. Therefore, one of the products, Zn₃(PO₄)₂, must be produced in a smaller quantity than the other product, LiNO₃.
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Calculate the number of valence electrons in methylene chloride, CH₂Cl₂.
Answer:
20 valence electrons
Explanation:
The number of valence electrons in carbon (C), hydrogen (H), and chlorine (Cl) are 4, 1, and 7, respectively. The number of total valence electrons (TVE) in CH₂Cl₂ is calculated as follows-
TVE in CH₂Cl₂ = valence electrons in C + 2(valence electrons in H) + 2(valence electrons in Cl)
= 4 + 2(1) + 2(7)
= 20
Use the kinetic-molecular theory to explain each observation given.
a. Wax melts near the flame of a burning candle.
b. Liquid water may be converted into ice cubes in a freezer.
c. Ginger ale flows to match the shape of a glass.
d. Water gradually evaporates from a swimming pool.
e. Water vapor condenses inside house windows on cold days.
f. Snow gradually disappears, even when the tem- perature remains below freezing. g. Solids and liquids cannot be compressed as much as gases.
a. Wax melts near the flame of a burning candle because the kinetic-molecular theory states that the higher the temperature, the faster the molecules move. Since the flame of a burning candle is hot, the wax molecules move faster, allowing them to take up more space and eventually melt.
What is kinetic-molecular theory?The kinetic-molecular theory is based on the following five fundamental principles:
A gas's average molecular lengths between its constituent molecules are significantly greater than their individual sizes. The volume occupied by the gas' molecules is negligible in comparison to the volume of the gas itself.Both the molecules and the container walls are not attracted to one another in a perfect gas.As physical objects, the molecules move erratically and continually and are governed by Newton's laws of motion. The molecules travel in a straight line until they come into contact with one another or the container walls. Collisions are totally elastic; even if the kinetic energies and orientations of two molecules may change during a collision, the total kinetic energy is preserved. Collision is not "sticky".The average gas molecule's kinetic energy and absolute temperature are directly correlated. Because individual molecules' velocities and kinetic energies will vary greatly, with some even experiencing zero velocities at some moments, the word "average" is significant in this context. This implies that all molecular motion would cease if the temperature dropped to absolute zero.
Continued:b. Due to the fact that the kinetic-molecular theory predicts that molecules move more slowly at lower temperatures, liquid water can be frozen into ice cubes in a freezer. The water molecules travel very slowly and arrange because a freezer is significantly colder than room temperature, which enables them to form ice cubes.
c. All matter is made up of a large number of tiny particles that are always in motion, according to the kinetic-molecular theory. When the ginger ale is poured into the glass, the velocity of the liquid's molecules causes them to spread out and fill the form of the vessel.
d. The kinetic-molecular theory states that the molecules in a liquid are in constant motion, and that when they move, they bump into each other, passing energy from one to the other. This energy causes the particles to move faster. As they move faster, they create turbulence that causes them to break away from the liquid surface. These particles then form a vapor, which is an invisible form of water called water vapor. As these particles accumulate together, they gradually evaporate from the swimming pool, eventually diminishing its water level.
e. Water vapor condenses inside house windows on cold days because the molecules of water vapor slow down and as they lose energy they no longer have enough kinetic energy to remain in the gaseous state. The molecules then condense and form liquid water droplets on cool surfaces such as windows.
f. Snow gradually disappears even when the temperature remains below freezing because the heat stored in the snow starts to melt the snow. This occurs even when the outside temperature remains at freezing or below because the heat is released from the snow and warms the surrounding air.
g. Solids and liquids cannot be compressed as much as gases because the particles of gases have more energy and thus more freedom of movement than particles of solids and liquids. The particles of gases can move around and can occupy larger spaces than particles of solids and liquids, allowing them to be compressed more effectively.
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Name the following compounds NH4CI
The compound NH4Cl or ammonium chloride is composed of two ions: ammonium ion (NH4+) and chloride ion (Cl-). The ammonium ion is a polyatomic cation made up of one nitrogen atom and four hydrogen atoms, while the chloride ion is a monatomic anion made up of one chlorine atom.
O Macmillan Learning
What is the IUPAC name for the compound shown?
IUPAC name:
The IUPAC name for this compound is 2,2-methyl-3ethylhexane.
What is a compound's IUPAC name?The IUPAC terminology is based on the longest chain of carbons joined by a single bond, whether it be a continuous chain or a ring. Prefixes or suffixes are used to denote any modifications, regardless of whether they include multiple bonds or atoms other than carbon and hydrogen.
Who are you according to IUPAC?The International Union of Pure and Applied Chemistry's (IUPAC) suggested system for naming organic chemical compounds is used in chemical nomenclature (IUPAC). The Organic Chemistry Nomenclature publishes. It is the organisation most renowned for its work establishing nomenclature standards in chemistry and other scientific disciplines.
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A-scientist has a 2.5 g-sample of radium-226: How many grams of the sample will decay.in-800
-years if the half-life is 1600-years?
The mass (in grams) of the sample that will decay in 800 years, given that the half-life is 1600-years is 0.78 g
How do i determine the amount that will decay in 800 years?We shall begin our calculation by obtaining the number of half lives that has elapsed after 800 years. Details below:
Half-life (t½) = 1600 yearsTime (t) = 800 yearsNumber of half-lives (n) =?n = t / t½
n = 800 / 1600
n = 0.5
Next, we shall determine the amount remaining after 800 years. Details below:
Original percentage (N₀) = 2.5 gNumber of half-lives (n) = 0.5Amount remaining (N) = ?N = N₀ / 2ⁿ
N = 2.5 / 2^0.5
N = 1.77 g
Finally, we shall obtain the mass of the sample that has decayed in 800 years. Details below:
Original amount (N₀) = 2.5 gAmount remaining (N) = 1.77 gMass that decay =?Mass that decay = N₀ - N
Mass that decay = 2.5 - 1.77
Mass that decay = 0.78 g
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1AgNO3+1NaBr->1AgBr+1NaNo3
If 15.0g silver nitrite is reacted with excess sodium bromide, how many moles of silver bromide will form?
0.0882 moles of silver bromide (AgBr) will form.
calculating the number of moles of silver nitrate (AgNO₃) used in the reaction:
moles of AgNO₃ = mass / molar mass
The molar mass of AgNO₃ is:
AgNO₃: 107.87 + 14.01 + 3(16.00) = 169.87 g/mol
So, the number of moles of AgNO₃ used is:
moles of AgNO₃ = 15.0 g / 169.87 g/mol = 0.0882 mol
Since the reaction occurs in a 1:1 ratio of AgNO₃ to AgBr, the number of moles of AgBr produced will also be 0.0882 mol.
Therefore, 0.0882 moles of silver bromide (AgBr) will form.
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What is a product?
A. A substance that is used during a chemical reaction
B. A substance that doesn't change during a chemical reaction
OC. A substance that turns into waste during a chemical reaction
OD. A substance that is produced during a chemical reaction
Answer:
D. something's that's produced during a chemical reaction
Answer:
Explanation:
The answer is Option D.
A substance that is produced during a chemical reaction.
for example in a chemical reaction A+B -----> C
here, reactants A and B react together to produce product C.
informartion on rhenium oxide in 100 words
Rhenium oxide is a chemical compound composed of rhenium and oxygen atoms. Its chemical formula is ReO3, and it is a black or dark gray solid with a crystalline structure. Rhenium oxide is a highly refractory material with a very high melting point and excellent thermal stability, which makes it useful in high-temperature applications such as furnace linings and electrical contacts. It is also used as a catalyst in various chemical reactions, including the production of synthetic ammonia and in the dehydrogenation of alcohols. Rhenium oxide is a relatively rare material and is generally produced as a byproduct of other mining and refining processes. It has a number of unique properties that make it valuable in a variety of industrial and scientific applications.
complete the following bca table for the following reaction. 4.0 moles of silver nitrate is combined with an unknown amount of calcium bromide to produce two products in a double replacement reaction. name and provide the number of moles for each product.
4 moles of AgBr is produced
2 moles of Calcium nitrate is produced
What is the stoichiometry?Stoichiometry is used in calculating the quantities of the reactants and products in a chemical reaction as well as identifying the limiting reactant are all part of this process.
The reaction equation is;
[tex]CaBr_{2} (aq) + 2 AgNO_{3} (aq) ---- > 2 AgBr (s) + Ca(NO_{3} )_{2} (aq)[/tex]
If 2 moles of [tex]AgNO_{3}[/tex] produces 2 moles of AgBr
4 moles of [tex]AgNO_{3}[/tex] will produce 4 * 2/2 = 4 moles of AgBr
If 2 moles of [tex]AgNO_{3}[/tex] produces 1 mole of Calcium nitrate
4 moles of [tex]AgNO_{3}[/tex] will produce 4 * 1/2
2 moles of Calcium nitrate
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Calculate the mass of the white solid calcium carbonate that forms with 25.0L of a 0.100 M calcium nitrate solution mixed with 20.0 mL of a 0.15M sodium carbonate solution.
Answer:
The mass of the white solid calcium carbonate that forms is 0.300 g.
Explanation:
To calculate the mass of the white solid calcium carbonate that forms, we first need to determine the limiting reagent in the reaction between calcium nitrate and sodium carbonate. The balanced chemical equation for the reaction is:
Ca(NO3)2(aq) + Na2CO3(aq) → CaCO3(s) + 2NaNO3(aq)
From the equation, we can see that one mole of calcium nitrate reacts with one mole of sodium carbonate to produce one mole of calcium carbonate. Therefore, the limiting reagent is the one that produces the least amount of calcium carbonate.
To determine the limiting reagent, we need to calculate the moles of calcium nitrate and sodium carbonate used in the reaction:
Moles of calcium nitrate = volume of solution (L) x concentration (mol/L) = 25.0 L x 0.100 mol/L = 2.50 mol
Moles of sodium carbonate = volume of solution (L) x concentration (mol/L) = 0.0200 L x 0.150 mol/L = 0.00300 mol
Since the moles of sodium carbonate are much smaller than the moles of calcium nitrate, sodium carbonate is the limiting reagent.
The balanced chemical equation tells us that one mole of calcium carbonate is produced for every mole of sodium carbonate used. Therefore, the moles of calcium carbonate produced are also equal to 0.00300 mol.
Finally, we can calculate the mass of calcium carbonate produced using the molar mass of calcium carbonate:
Mass = moles x molar mass = 0.00300 mol x 100.1 g/mol = 0.300 g
Therefore, the mass of the white solid calcium carbonate that forms is 0.300 g.
the question says “preform the following unitless calculations and round the final answer to the proper number of significant figures. Assume that all the numbers came from measurements” Please help me I don’t understand
Unitless calculations and rounding the final answer to the proper number of significant figures : a) 3.323 b) 5.8 c) 42.02 d) 15.7025
What is meant by significant figures?Significant figures represent the meaningful and reliable digits in a number.
a) 3.41 - 0.086652 = 3.323348
Since both numbers have four significant figures, the final answer should also have four significant figures. Therefore, rounding the final answer to four significant figures gives: 3.323
b) 17.441 / 3 = 5.813666666666666
The least precise value in this calculation is 3, which has only one significant figure. Therefore, rounding the final answer to one significant figure gives: 5.8
c) 21.01 * 2 = 42.02
Both numbers have four significant figures, so the final answer should also have four significant figures. Therefore, the final answer is: 42.02
d) 18.7644 - 3.472 + 0.4101 = 15.7025
All three numbers have five significant figures, so the final answer should also have five significant figures. Therefore, the final answer is: 15.7025.
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Considering both the forward and reverse directions, identify the Bronsted acids in the reaction below:
CH₃NH₂(aq) + H₂S(aq) ⇄ CH₃NH₃⁺(aq) + HS⁻(aq)
A.) CH₃NH₂ and HS⁻
B.) H₂S and CH₃NH₃⁺
C.) CH₃NH₂ and N₂S
D.) H₂S and HS⁻
E.) CH₃NH₂ and CH₃NH₃⁺
Considering both the forward and the reverse directions, the Bronsted acids in the reaction is H₂S and CH₃NH₃⁺. The correct option is B.
The chemical reaction is as :
CH₃NH₂(aq) + H₂S(aq) ⇄ CH₃NH₃⁺(aq) + HS⁻(aq)
According to the Bronsted - Lowry theory, acids are the substance that will donates the H⁺ ion or the proton and it will forms the conjugate base.
In the forward reaction, the H₂S donates the proton to the CH₃NH₂.
In the reverse reaction, the CH₃NH₃⁺ will donates the proton to the HS⁻.
Hence, the Bronsted - Lowry acids in the reversible reaction are H₂S and CH₃NH₃⁺. The option B is correct.
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