Answer:
5°c or below
Explanation:
it is when it is above said temperature the human body may feel cold but you do not need to wear a winter coat
Identify the items needed to run a spectrophotometry experiment. - spectrophotometer - hot plate - blank solution - sample solutions - cuvette - stir bar
A spectrophotometry experiment involves spectrophotometer, blank solution ,sample solutions and cuvette .
What is spectrophotometer?
Spectrophotometry is a method to measure how much a chemical substance absorbs light by measuring the intensity of light as a beam of light passes through sample solution. The basic principle is that each compound absorbs or transmits light over a certain range of wavelength.
This measurement can also be used to measure the amount of a known chemical substance. Spectrophotometry is one of the most useful methods of quantitative analysis in various fields such as chemistry, physics, biochemistry, material and chemical engineering and clinical applications.
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what properties does water have that make it a very versatile fluid
Water is a very versatile fluid because it has several unique and important properties, including High heat capacity, surface tension, heat of vaporization.
Water has a high heat capacity, which means it can absorb a lot of heat energy without undergoing a large increase in temperature. This property helps to regulate the temperature of the Earth's climate and makes water an effective coolant in many industrial processes. Water has a high surface tension, which allows it to form a thin, cohesive layer on the surface of other materials. This property makes water an effective lubricant, and it helps small organisms like insects and spiders to walk on the surface of water.
Water has a high heat of vaporization, which means it requires a large amount of heat energy to change from a liquid to a gas. This property allows water to be an effective coolant, and it helps regulate the temperature of the human body through sweating.
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How to Draw the Dot Structure for Carbon Dioxide?
The dot structure for carbon dioxide (CO2) represents the arrangement of its constituent atoms and their valence electrons. Carbon dioxide is a linear molecule with the carbon atom in the center and two oxygen atoms attached to it.
To draw the dot structure for CO2, you first need to know the number of valence electrons for each atom. Carbon has four valence electrons, and each oxygen atom has six valence electrons. This gives a total of 16 valence electrons for CO2.
The dot structure is drawn by placing the atoms in the correct positions and then drawing single bonds between the carbon atom and each oxygen atom. The remaining valence electrons are then placed as lone pairs on the oxygen atoms to complete their octets.
It is important to follow the octet rule, which states that atoms tend to gain, lose, or share electrons to achieve a stable configuration of eight electrons in their outermost shell. In the case of CO2, each atom has a full octet, making the molecule stable.
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What is the formal charge of a nitrogen atom that has no lone pairs and forms two double bonds? A. -2 B. -1 C. 0 C. +1D. +2
The formal charge of a nitrogen atom that has no lone pairs and forms two double bonds is +1
The formal charge of an atom is calculated by subtracting the number of lone pair electrons and half the number of bonding electrons from the number of valence electrons.
Nitrogen having atomic number 7 and electronic configuration 1s²2s²2p³ has five valence electrons. If it forms two double bonds, then it is sharing four electrons with each bond, for a total of 8 electrons. This means that nitrogen has lost 3 electrons compared to the neutral atom, due to which it will have a formal charge of +1.
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C3H8 + 5O2 ➡ 3CO2 + 4H2O
How many moles of CO2 produced if 12 moles of C3H8 are used in the reaction?
When 12 moles of C3H8 are used in the reaction, 36 moles of CO2 are created.
How much CO2 is generated from a mole of C3H8?Every time one mole of C3H8 propane reacts with five moles of oxygen, three moles of carbon dioxide (CO2) and four moles of water (H2O) are produced.
The balanced chemical equation reads as follows: C3H8 + 5O2 3CO2 + 4H2O
We can observe that 3 moles of CO2 are created for every 1 mole of C3H8 that is used in the process.
We need to carry out a straightforward mole-to-mole conversion to determine how many moles of CO2 are generated when 12 moles of C3H8 are used:
12 moles C3H8 x (1 mole C3H8 / 3 moles CO2) = 36 moles CO2.
As a result, when 12 moles of C3H8 are used in the reaction, 36 moles of CO2 are created.
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Show a numerical setup for converting 120. kPa to atmospheres.
Answer and Explanation:
To convert 120 kPa to atmospheres, we can use the following conversion factor:
1 atmosphere = 101.325 kPa
We can use this conversion factor to set up a proportion and solve for the number of atmospheres.
120 kPa * (1 atm / 101.325 kPa) = 1.184 atm
Therefore, 120 kPa is equivalent to approximately 1.184 atmospheres (rounded to three decimal places).
the phase change in which a solid goes directly to the gas statei called?
The process of sublimation occurs when a solid transitions straight to a gas state.
What is the gas state?Gas is a state of matter distinguished by its widely separated, quickly moving, and haphazardly ordered particle structure. The gaseous state, in which gases are substances, is one of the three fundamental states of matter. Gases are highly compressible and have extraordinarily large intermolecular distances.
Why does matter have a condition of gas?Other than being in solids and liquids, matter can also exist in the physical form of gases. Every gas has a weight. In contrast to liquids or solids, gases will fill the entire container in which they are contained.
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What does an increase in the serum enzyme levels indicate?
A. Decreased enzyme catabolism
B. Accelerated enzyme production
C. Tissue damage and necrosis
D. Increased glomerular filtration rate
An increase in serum enzyme levels generally indicates - the correct answer is option C (tissue damage and necrosis).
When cells are damaged or die, enzymes that are normally contained within the cells can leak into the bloodstream. This can result in an increase in the level of certain enzymes in the blood, which can be detected by a blood test.
The specific enzyme that is elevated can provide clues about the location and extent of the tissue damage. For example, an increase in liver enzymes such as alanine transaminase (ALT) or aspartate transaminase (AST) may indicate liver damage, while an increase in creatine kinase (CK) or lactate dehydrogenase (LDH) may indicate muscle damage.
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The electron transport chain is considered an aerobic pathway, meaning it requires ____________.a. Waterb. Oxygenc. Carbon dioxided. Nitrogen
Option- B : The electron transport chain is considered an aerobic pathway, meaning it requires Oxygen.
Cellular respiration may be divided into two categories: aerobic and anaerobic. One occurs when there is a supply of oxygen (aerobic), whereas the other takes place without the help of oxygen (anaerobic). Both begin with the splitting of glucose during glycolysis. Anaerobic systems, like glycolysis, function with out oxygen that exists.
Oxygen and glucose combine during cellular respiration to create ATP. Byproducts also include release of water and carbon dioxide. The Krebs cycle, oxidative phosphorylation, and glycolysis—an anaerobic process—are the three steps of aerobic cellular respiration.
Aerobic refers to the body's use of oxygen to produce energy and implies "with air." Any exercise last more than two minutes generally falls into this group. Aerobic exercise is performed continually in a "steady state." The term anaerobic means "without air."
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According to kinetic molecular theory, how do the gas particles in this container behave?
Question 3 options:
Gas particles are elastic and do not attract each other.
The kinetic energy of gas is dependent on temperature.
Energy is not lost when gas particles collide with each other or with the walls of the container.
All of the above.
Answer:
All of the above. According to the Kinetic Molecular Theory, the gas particles in this container behave in an elastic manner, meaning that they will bounce off each other and the walls of the container without losing energy. The kinetic energy of the gas particles is also dependent on temperature, meaning that the higher the temperature, the faster the particles will move. Finally, energy is not lost when gas particles collide with each other or the walls of the container.
Energy is not lost when gas particles collide with each other or with the walls of the container. Therefore, all of the above are correct.
What is kinetic molecular theory?The gas laws mentioned in earlier modules of this chapter are adequately explained by the kinetic molecular theory (KMT), a straightforward microscopic model. The five postulates listed below form the foundation of this theory.
Although certain gases, like the noble gases, are made up of atomic species, the term "molecule" is going to be employed to refer to the specific chemical species that make up the gas. Gas particles are elastic and do not attract each other. The kinetic energy of gas is dependent on temperature. Energy is not lost when gas particles collide with each other or with the walls of the container.
Therefore, all of the above are correct
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the oxidation number of a phosphorus atom in p₄ is
A. +4 B. +3 D. -3
E. 0
There were no matches again for oxidation number of such a phosphorus atom in the formula p4: A. +4 B. +3 D. -3 E. 0 Chemically speaking, phosphorus has the atomic number 15 and the letter P.
Are there phosphorus atoms with more than 15 protons?A phosphorus atom has fifteen protons. An element can be distinguished from another element by its atom by its atomic number. The amount of protons in the atom's nucleus determines this figure. The nucleus of phosphorus contains 15 protons, as indicated by the element's atomic number, which is 15.
How many atoms are there in phosphorus?Phosphorus is only found in phosphates, which are compounds made up of a phosphorous element bound to four other elements, in its pure form in nature.
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an experimental volume of 21.4 l is determine for 1 mole of gas at stp. what is the experimental error?
A total of 4.46% of the experiment was off. For a single mole of gas at stp, an experimental volume = 21.4 l is found.
How do you define experimental molar volume?One mole of the a chemical element and chemical compound occupies one molar volume (Vm) at standard pressure and temperature (STP). The molarity (M) and mass density () can be divided to calculate it.
In an experiment, how do you quantify volume?The concept of volume is broad. With specialized glassware and measuring units commonly in milliliters (mL) or liters, the volume of the a liquid can be determined directly (L). This experiment will involve measuring liquid quantities with a beaker, 2 graduated cylinders, and a burette. The accuracy of these instruments will be compared.
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how many k and s2- ions would be in one formula unit of the ionic compound
K2S is created in a complex by K+ and S2-. Two K+ ions and one S2- ion, for a total of three ions, are present in a single formula unit.
What is an ion?
Any particle or collection of atoms with one or more positive or negative electrical charges is known as an ion. Cations are positively charged ions, and anions are negatively charged ions. Ions are created when neutral atoms, molecules, or other ions have electrons added to them or taken away from them. Ions can also be created when other particles are combined with them, or when a covalent bond between two atoms is broken and both of the bond's electrons are left in association with one of the former bonded atoms. These processes include the addition of a hydrogen cation to an ammonia molecule to create an ammonium cation, the reaction of an atom of sodium with an atom of chlorine to form a sodium cation and a chloride anion, and others.
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When should you replace your gloves in an organic lab? Select one or more: When there is any visible tear in the gloves When the gloves have been exposed to a solvent When you handle a new piece of glassware When you mix two chemicals in the lab
When there is any visible tear in the gloves is a correct answer to the question.
It is important to replace gloves immediately if there is any visible tear or puncture, as this can compromise the integrity of the glove and expose you to harmful chemicals or pathogens.
When the gloves have been exposed to a solvent is also a correct answer, as solvents can degrade glove materials and compromise their ability to provide protection. It is important to replace gloves if they have been exposed to solvents to ensure that they provide adequate protection.
When you handle a new piece of glassware and When you mix two chemicals in the lab are not necessarily reasons to replace gloves. However, it is always important to follow the specific protocols and guidelines established by your lab to ensure safe handling of chemicals and materials.
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In the following acid-base reaction,
H3O+ is the
HCI(g) + H2O(l) → H3O+(aq) + Cl-(aq)
Conjugate base
Conjugate acid
Acid
Due to the protons it provided, HCl(g). Due to the fact that it can lose a proton in the opposite process, H3O+ is the conjugate acid of H2O.
Reaction is what, exactly?Rearranging the atoms and molecules of two or more chemicals when they come into touch with one another, producing the production of one or more new substances. The interaction of two different substances' electrons is what drives chemical reactions.
What does the chemical reaction process entail?Chemical reactions entail the formation of new bonds between atoms in the reactant molecules and the breaking of existing links between reactant molecules in the product particles. Both before and after the chemical transition, there were the same number of atoms, but the number of molecules will vary.
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classify each reaction as homolysis or heterolysis.A) homolysis, hetrolysis, hetrolysis, hetrolysisB) homolysis, hetrolysis, hetrolysis, homolysisC) homolysis, homolysis, homolysis, homolysisD) hetrolysis, hetrolysis, homolysis, homolysis
Answer:
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Explain how potential energy and kinetic energy are the same .How are they different
The potential energy and kinetic energy are the same as they are interconvertible with each other. The potential energy occurs when the body is at rest and the kinetic energy occurs when the body is in the motion.
The Potential and the kinetic energy are two forms of the energy that can be converted in to the each other. Potential energy is the stored energy in the object or the system by the virtue of its the position or the arrangement of parts. The kinetic energy is the energy of the object or the system's particles in the motion.
When an object is at the rest, the body is said to have the potential energy. In another case, if the object is in the motion, then it is said to have the kinetic energy.
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lead with the element symbol pb is commonly used in batteries
a. 0, +1, +2
b. +4+4, 0, +2
c. +1, +2. +14
The appropriate Pb oxidation number in each of these compounds is +4,0,+2, according to option (b).
What does oxidation in a redox reaction entail?The oxidation states of the substrate fluctuate during a redox (reduction-oxidation) reaction. When an oxidation occurs, the oxidation state increases or electrons are lost, but when a reduction occurs, electrons are added or the oxidation state decreases.
Are Pb batteries made of lead acid?The negative lead and positive lead dioxide electrodes are dissolved in the sulfuric acid electrolyte to produce a low-cost first-action battery. The electrodes' number of plates, size, or other characteristics can be altered depending on the intended function.
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Select the keyword or phrase that will best complete each sentence.
Hydrolysis of an ester under basic conditions is called ___
Proteins are polymers of amino acids joined together by ___
In the proton NMR spectraa, the N-H proton of primary and secondary amides absorb at ___ ppm
A lactone is a cyclic ___ in which the carbonyl carbon-heteroatom o bond is part of a ring
Treatment of nitriles have an absorption at ___ cm^-1 for the CsN
A lactam is a cyclic ____ in which the carbonyl carbon-heteroatom o bond is part of a ring
F or a nucleophlic acyl subsitution reactan, when there is a better the leaving group. the ___ reactive the carboxylic acid derivative
Treatment of nitriles with LIAIH4 followed by water will add two equivalents of H2 across the triple bond, forming ___
Key terms:
Aldehydes 2250
amine 1° amines
more ketone
ester amide
3200 7.5 - 8.5
0.5-5.0 saponification
esterification 1750
Hydrοlysis οf an ester under basic cοnditiοns is called sapοnificatiοn.
Prοteins are pοlymers οf aminο acids jοined tοgether by peptide bοnds.
Explain abοut the sapοnificatiοn?Sapοnificatiοn is the hydrοlysis οf an ester under basic cοnditiοns.
Prοteins are aminο acid pοlymers held tοgether by peptide bοnds.
The N-H prοtοn οf primary and secοndary amides absοrbs at 7.5 - 8.5 ppm in prοtοn NMR spectraa.
Lactοnes are cyclic esters with a carbοnyl carbοn-heterοatοm bοnd that fοrms part οf a ring.
The absοrptiοn οf nitriles is at 2250 cm⁻¹ fοr the CN.
Lactam is a cyclic amide with a carbοnyl carbοn-heterοatοm bοnd that fοrms part οf a ring.
When a nucleοphilic acyl substitutiοn reactant has a better leaving grοup, the carbοxylic acid derivative is mοre reactive.
When nitriles are treated with LIAIH4 fοllοwed by water, twο equivalents οf H2 are added acrοss the triple bοnd, fοrming 1° amines.
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What is the difference between cis and trans isomers?
The main difference between cis and trans isomers lies in the configuration of atoms in the double bonds. Cis isomers contain two similar atoms lying on identical sides of the double bond in a molecule.
Trans isomers have molecules with two identical atoms that are positioned on opposite sides of double bond. Cis isomers are molecules with the identical connectivity of atoms. They attribute some side groups positioned on the same side of a double bond. Trans isomers are part molecules with same side groups put on opposite sides of a double bond. Cis isomers are basically invariably polar. Trans isomers are not absolutely polar. Multiple trans isomers are non-polar molecules. Due to loosely compacted molecules, cis isomers have somewhat lower melting points than trans isomers.
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what is magnesium nitrate formula?
The formula of the magnesium nitrate is Mg(NO₃)₂. The magnesium nitrate that is Mg(NO₃)₂ is the ionic compound.
The Magnesium nitrate is the compound that contains the one atom of the magnesium, the two atoms of the nitrogen, and the six atoms of the oxygen. The formula of the magnesium nitrate is Mg(NO₃)₂.
The Magnesium Nitrate is an ionic compound that is formed by the cation of the Magnesium Mg²⁺, and the polyatomic anion that is the Nitrate NO³⁻ ion. The charges will be equal and it will be the opposite in order for the two ions to form the bond together. Therefore, the one charge of + 2 of the magnesium ion will be require the two charge of -1 nitrate ions to balance it.
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What pressure, in atmospheres, is exerted by 1.725 mol of hydrogen gas (O2) in a 4.78 L container at 298K? Use Correct Sig Figs
8.94atm is the pressure, in atmospheres, is exerted by 1.725 mol of hydrogen gas (O2) in a 4.78 L container at 298K.
What is pressure?The force delivered perpendicularly to an object's surface per unit area throughout which this force is dispersed is known as pressure. The pressure as compared to the surrounding air is known as gauge pressure (445).
Pressure is expressed using a variety of units. Some of these come from dividing a unit of force by such a unit of area; for instance, the SI force acting on the object, the pascal (Pa), is equal to one newton every square meter.
P×V = n×R×T
P×4.78 =1.725×8.314×298
P =8.94atm
Therefore, 8.94atm is the pressure, in atmospheres, is exerted by 1.725 mol of hydrogen gas (O2) in a 4.78 L container at 298K.
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which element is a main group element with an odd atomic number? a) titanium (ti) b) cobalt (co) c) krypton (kr) d) iodine (i)
Iodine is the element which is a main group element with an odd atomic number. Therefore, the correct option is option D.
What is main group element?The main group of elements in chemistry as well as atomic physics are those whose lightest members are depicted by helium, alkaline earth metals, beryllium, boron, dioxide, nitrogen, oxygen, as well as fluorine as listed inside the the element's periodic table. This group of elements is also referred to as the representative elements.
Except for hydrogen, which is occasionally excluded, the elements in group 1 and 2 (s-block) plus groups 13 to 18 make up the major group (p-block). Iodine is the element which is a main group element with an odd atomic number.
Therefore, the correct option is option D.
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which will be the final volume when 400 ml of 0.6 m hcl is diluted to 0.5 m hcl?
The final volume is when the 400 ml of 0.6 M HCl is diluted to the 0.5 M HCl is 480 mL.
The initial molarity of the solution , M₁ = 0.6 M
The initial volume of the solution, V₁ = 400 mL
The final molarity of the solution, M₂ = 0.5 M
The final volume of the solution, V₂ = ?
The dilution law is expressed as :
M₁ V₁ = M₂ V₂
V₂ = M₁ V₁ / M₂
V₂ = ( 0.6 × 400 ) /0.5
V₂ = 480 mL
Thus, the final volume of the solution is 480 mL with the molarity of the 0.5 M.
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Why should you read volumes at the bottom of a meniscus?
We should read volumes at the bottom of a meniscus because it allows us to get better and accurate result.
Generally the curve present in chemical apparatus is known as a meniscus. Basically, the graduated cylinder is calibrated so that reading the bottom of the meniscus, when it is viewed at eye level, will give best and accurate results. And viewing the meniscus at any other angle than eye level will give inaccurate results.
We should measure so that the line you are reading must stay even with the center of the meniscus. Let's consider an example in water and most other liquids, this is the bottom of the meniscus. But for mercury, take the measurement from the top of the meniscus. In both cases, we are measuring based on the center of the meniscus.
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What is type of ammonia: basic or acidic?
NH3 or ammonia is a basic substance. By taking a proton (H+) from an acid to create the ammonium ion (NH4+), it can function as a weak base. Ammonia will combine with water molecules in water to generate
Ammonia (NH3), an odourless gas with a wide range of industrial applications, is widely utilised. It is a crucial ingredient in the creation of plastics, cleaning supplies, and fertilisers. In addition to these uses, ammonia is also a refrigerant and is a component in the manufacturing of drugs and explosives. It can accept a proton (H+) from an acid to generate the ammonium ion (NH4+) since it is a basic molecule. Ammonia creates hydroxide and ammonium ions in water, which results in a basic solution. Yet, ammonia is also a hazardous gas that, if handled improperly, may be detrimental to both humans and animals.
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how much distilled water must be added to 0.5 ml of 0.1 m fecl3 to make it 0.001 m fecl3 (in units of ml)?
Therefore, 50 mL of distilled water must be added to 0.5 mL of 0.1 M FeCl₃ to make it 0.001 M FeCl₃.
What is distilled water?Distilled water is a type of purified water that has gone through a process of distillation, which involves boiling water and then condensing the steam into a separate container. This process removes impurities and minerals from the water, resulting in a very pure form of water. Distilled water is often used in laboratory experiments and medical procedures where purity is important. It can also be used in household appliances, such as irons and humidifiers, to prevent mineral buildup that can lead to damage or decreased performance.
Here,
To calculate the amount of distilled water that must be added to 0.5 mL of 0.1 M FeCl₃ to make it 0.001 M FeCl₃, we can use the dilution formula:
M1 x V1 = M2 x V2
where M1 is the initial concentration, V1 is the initial volume, M2 is the final concentration, and V2 is the final volume.
We can rearrange this formula to solve for V2, which represents the volume of water that must be added:
V2 = (M1 x V1) / M2
Plugging in the values we have:
M1 = 0.1 M (the initial concentration)
V1 = 0.5 mL (the initial volume)
M2 = 0.001 M (the final concentration)
V2 = unknown (the volume of water to be added)
V2 = (0.1 M x 0.5 mL) / 0.001 M
V2 = 50 mL
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__________ stored in chemical bonds of a molecule can be used to make new bonds in a different molecule.
The energy stored in chemical bonds of a molecule that can be used to make new bonds in a different molecule is called chemical potential energy.
When a chemical reaction occurs, the reactant molecules have a certain amount of chemical potential energy stored in their bonds, and this energy is either released or absorbed as new bonds are formed in the product molecules. The amount of chemical potential energy stored in a molecule depends on the types and arrangements of atoms in the molecule, as well as the strength of the chemical bonds between them.
The strength of the chemical bonds in a molecule depends on several factors, including the types of atoms involved, the number and arrangement of electrons around those atoms, and the way in which those electrons are shared or transferred between the atoms to form the bond. Bonds that involve the sharing of electrons, such as covalent bonds, tend to be stronger than bonds that involve the transfer of electrons, such as ionic bonds.
Chemical reactions occur when reactant molecules come into contact with one another and the energy stored in their chemical bonds is either released or absorbed as new bonds are formed in the product molecules. The energy released or absorbed during a chemical reaction is known as the enthalpy change, and it reflects the difference in the total chemical potential energy between the reactant and product molecules.
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How many oxygen atoms are there in 52.06 g of carbon dioxide?(a) 1.204×10241.204×1024(b) 5.088×10235.088×1023(c) 1.424×10241.424×1024(d) 6.022×10236.022×1023(e) 1.018×10241.018×1024
option (c) 1.424×10^24 oxygen atoms.To determine the number of oxygen atoms in 52.06 g of carbon dioxide, we first need to calculate the number of moles of carbon dioxide present in the given sample.
The molar mass of carbon dioxide is 44.01 g/mol, which means that 1 mole of carbon dioxide contains 6.022×10^23 molecules. Therefore, the number of moles of carbon dioxide present in 52.06 g of the compound can be calculated as follows:
Number of moles = Mass/Molar mass = 52.06 g / 44.01 g/mol = 1.182 mol
Each molecule of carbon dioxide contains one carbon atom and two oxygen atoms. Thus, the total number of oxygen atoms in the sample can be calculated by multiplying the number of moles of carbon dioxide by the number of oxygen atoms per molecule and Avogadro's number (6.022×10^23):
Number of oxygen atoms = 2 × Number of moles × Avogadro's number
= 2 × 1.182 mol × 6.022×10^23
= 1.424×10^24
Therefore, the correct answer is option (c) 1.424×10^24 oxygen atoms.
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What are the 3 types of mixtures?
Solutions, suspensions, and colloids are the three categories into which mixtures can be divided based on particle size.
A mixture is a substance composed of two or more additional chemical compounds or substances that do not chemically combine.
Little particles with a particle size of less than 1 nanometer are present in a solution. Centrifugation or decantation of the mixture cannot be used to separate the components of a solution. Air is one example of this.
A colloid is a mixture in which a component made up of insoluble particles that are scattered at a microscopic scale is suspended within another component. While some definitions limit the concept to liquid-dispersed particles, others broaden it to encompass materials like aerosols and gels.
A heterogeneous mixture of a finely dispersed substance in a liquid is referred to as a suspension. Similar to how salt and water dissolve in one another, the solid is not dissolved in the liquid.
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