Which would be an example of a compound?
oxygen
carbon dioxide
sand
carbon
Answers
Answer:
carbondioxide is an example of compound.
Related Questions
The space shuttle heats up during reentry. Which term best describes what is causing
this?
O friction
O gravity
O acceleration
o velocity
Answers
which of the following is formed by intense heat and pressure over millions of years?
A:Igneous
B:Metamorphic
C:Sedimentary
D:Magma
Answers
Answer:
B:Metamorphic
Explanation:
Rocks formed under high heat and pressure is essentially the definition of metamorphic rock :)
Why are alkali metals so reactive?
Answers
Answer:
Alkali metals are among the most reactive metals. This is due in part to their larger atomic radii and low ionization energies. They tend to donate their electrons in reactions and have an oxidation state of +1. ... All these characteristics can be attributed to these elements' large atomic radii and weak metallic bonding.
Explanation:
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A cell membrane is more flexible than a brick wall. Why might many cells benefit from a flexible cell membrane?
Answers
A cell membrane is more flexible than a brick wall. Why might many cells benefit from a flexible cell membrane because it allows them to survive in and out of the cell.
The cell is surrounded by a membrane called as cell membrane . cell membrane is a semipermeable membrane. semipermeable membrane is the type of membrane which allows solvent particles to pass through it . or some molecules or ion . Therefore , many cells benefited by cell membrane as they can pass through it.
Thus, A cell membrane is more flexible than a brick wall. Why might many cells benefit from a flexible cell membrane because it allows them to survive in and out of the cell.
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Assessment question still i rise* common lit
5. what can the reader infer about the speaker from their conversation
with the audience?
a the speaker is amused by people who do not realize what their life
is really like.
b the speaker is tired of having to explain why they act the way they
do.
c the speaker has had many people try to shake their confidence.
d the speaker has tried to forget the past but knows they can't.
Answers
Based on the text "Still I Rise" on CommonLit, the reader can infer that the speaker has had many people try to shake their confidence.
The speaker repeatedly mentions how they have been talked about, lied about, and mistreated, yet they continue to rise up and overcome these obstacles.
This suggests that the speaker has had to endure negativity from others and has developed a resilient attitude as a result. The other answer choices, while they may be applicable to other aspects of the poem, are not supported by the conversation between the speaker and the audience.
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PLEASE ANSWER ASAP!
For her school Science ft Alyssa designs an experiment to learn more about
erosion. Her experimental set up is shown below
Using the illustration shown above, determine which of the following statements best
describes the independent variable itest variable). this experiment:
A The speed she pours the water, since it is the same for all trials.
B The amount of water she pours, because the amount she pours is the same.
C The height of the tray, because this is a change that may cause and effect on the experiment.
D The mass of sand that collects at the bottom of the tray, because this is what is being measured or observed.
Answers
Answer:A
Explanation:
To do the experiment
The experimental setup is the part of the scientific method that is done to prove the hypothesis. The test variable of the experiment is the height of the tray as it may cause an effect. Thus, option C is correct.
What is the independent variable?The independent variable has been the test variable that does not depends on other variables and is manipulated by the researcher. It has no fixed value and parameter and is subject to alteration so as to cause an effect on the other variable.
The height of the tray is the independent variable and the mass of the sand is the dependent variable. The height affects the mass of the sand eroded at the bottom. The speed and amount of water have been the controlled variable.
Therefore, option C. the height of the tray with the sand is the independent variable.
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For each of the following reactions, identify another quantity that is equal to DeltH degree rxn. 1. CH4(g) + 2O2(g) rightarrow CO2(g) + 2h2O(i) A. enathalpy of combustion of CH4 B. enthaply of formation of CO2(g) C. 4x bond energy of C - H D. 4x bond energy of C - H 2. CH4(g) rightarrow C(g) + $H(g) A. enthalpy of combustion of CH4 B. enthalpy of formation of C(g) C. 4x bond energy of C - H –
D. 4x bond energy of C – H
Answers
From the given reactions, another quantity that is equal to ΔH degree reaction is 1. enthalpy of combustion, 2. 4x bond energy of carbon-hydrogen bond, 3. enthalpy of formation and 4. -4x bond energy of CH bond.
Hence, the correct option is A.
Enthalpy of a reaction is defined as the total sum of the heat of the system in the reaction and the product of the pressure and volume of the system. In the first reaction, the enthalpy of combustion of methane in the presence of oxygen is calculated, which gives the change in heat during burning.
In the second reaction, bond breaking will give the heat change as 4x bond energy of the carbon and hydrogen bond is endothermic.
In the third reaction, the enthalpy of formation of methane will give the change in the enthalpy.
In the fourth reaction, the difference between the bond energies of the reactants and the products that are -4x bond energy of carbon and hydrogen will result in enthalpy change.
Hence, the bond of combustion and formation can be a component along with enthalpy.
Hence, the correct option is A.
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when a mg2 ion becomes a mg atom, the radius increases because the mg2 ion
Answers
The radius of the Mg atom increases because the Mg²⁺ has gained 2 extra electrons and a new shell has also been added.
Magnesium atom and ionGeneral, magnesium atom, Mg has 3 electron shells while magnesium ion, Mg²⁺ has 2 electron shells.
Since Mg is a metal, its atom is bigger that its ion, Mg²⁺.
Thus, to move from Mg²⁺ to Mg, the ion will need 2 extra electrons as shown below:
Mg²⁺ + 2e —> Mg
Since the Mg atom is bigger, it also means that the radius of the Mg is bigger than the radius of the Mg²⁺.
See attached photo for further details
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Which statement best describes a difference between electromagnetic waves
and mechanical waves?
A. Mechanical waves can transfer matter through empty space.
B. Electromagnetic waves vibrate in two directions that are
perpendicular to each other.
C. Mechanical waves transfer matter, not energy, from one place to
another.
D. Electromagnetic waves require empty space to transfer energy
from one place to another.
Answers
Answer:
C
Explanation:
electronic waves transmits energy but mechanical waves require a medium in order to transport their energy from bgg one place to another.
Answer:
it is B.) Electromagnetic waves vibrate in two directions that are
Explanation:
stay safe 2021
What are the uses of iron and it's reasons.
Answers
Answer:
Uses of iron
It is used to manufacture steel and also used in civil engineering like reinforced concrete, girders etc. Iron is used to make alloy steels like carbon steels with additives such as nickel, chromium, vanadium, tungsten, and manganese.
Answer:
iron is used to make water pipes.
used for making machines in industries.
used for making steam engine.
another name for folate is . a. pyridoxamine b. glutamic acid c. dfe d. folic acid e. foliage
Answers
folic Acid
Folic acid, often known as folate, is a water-soluble B vitamin that is necessary for the generation of healthy red blood cells and the regular functioning of the brain system. Folate is present in numerous foods, including leafy green vegetables, legumes, nuts, and grains. Numerous processed goods, including breakfast cereals, breads, and rice, contain it as well. Folic acid is essential for pregnant women because it prevents birth abnormalities. It is also crucial for people of all ages since it helps maintain the health and normal operation of the body's cells. Folic acid is also essential for the production and repair of DNA, as well as the breakdown of specific proteins. Without appropriate folic acid, the body cannot produce red blood cells effectively, which can result in anemia. It is essential to consume adequate amounts of folic acid through diet or supplementation.
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An ad claims that a supplement helps a person lose weight, helps curb appetite to snack less, raises levels of serotonin to make a person feel less hungry, blocks new fat from forming, and increases metabolism to have more energy and burn existing fat. The manufacturer of the supplement published the data from the study of the product.
The study of the supplement used 100 subjects between the ages of 20 and 65. Of the 100 participants, 50 were male and 50 were female. Once the participants were selected for the study, each had the visceral fat measured. After all 100 participants were measured, it was determined that each had a measurement of more than 90 centimeters.
The testing subjects were divided into two groups. One group of 50 received the supplement and one group of 50 received a placebo. The study lasted for 16 weeks, but after 12 weeks, both groups were given the placebo.
After 16 weeks, men in both groups had a slight decrease in body weight. At the end of the study, the group receiving the supplement had reduced visceral fat when compared to the placebo.
After reading this data summary, what do you think? Answer the following questions in a post. Each question is worth 2 points.
1.Based on the testing data of the supplement, were any of the product's claims, proven correct? If so, identify the claims.
2.What data led you to that conclusion?
3.Which of the product's claims, if any, were not proven to be correct?
4.What type of testing data would you need to see in support of those claims to believe they were true?
5.When you see a product advertised on social media, how can you determine whether it is making reliable claims?
Answers
Answer:
If FDA finds that the evidence supporting the proposed claim is credible and the claim can be qualified to prevent it from misleading consumers,
fda.gov
Explanation:
If pure water boils at 99.8 degrees celcius, what is the expected elevated boiling point of a solution of 2.50g of CaCl2, in 50.0mL (i.e., 50.0g) of H2O? For CaCl2, i = 3
Answers
INFORMATION:
We know that:
- pure water boils at 99.8 degrees celcius
And we must calculate the expected elevated boiling point of a solution of 2.50g of CaCl2, in 50.0mL (i.e., 50.0g) of H2O
STEP BY STEP EXPLANATION:
To calculate it, we need to use that:
Boiling point of solution = boiling point of pure solvent + boiling point elevation (ΔTb)
The elevation in boiling point (ΔTb) is proportional to the concentration of the solute in the solution. It can be calculated via the following equation.
\(ΔTb=i\times k_b\times m\)Where,
- i is the Van’t Hoff factor
- Kb is the ebullioscopic constant
- m is the molality of the solute
From given information, we know that:
- i = 3
Now, the ebullioscopic constant (Kb) is often expressed in terms of °C * kg * mol^-1. The value of Kb for water is 0.512.
So, kb = 0.512 °C * kg * mol^-1
Then, we must calculate the molality
\(\begin{gathered} Molality=\frac{\text{ moles of solute}}{\text{ kg of solvent}} \\ Molality=\frac{\frac{2.5g}{110.98\frac{g}{mol}}}{0.05kg}=0.45\frac{mol}{kg} \end{gathered}\)So, m = 0.45 mol/kg
Replacing the values in the formula for ΔTb
\(\begin{gathered} ΔT_b=3\times0.512\frac{\degree C\cdot kg}{mol}\times0.45\frac{mol}{kg} \\ ΔT_b=0.69\degree C \end{gathered}\)Finally, the expected elevated boiling point of the solution would be
\(\text{ Boling point of solution}=99.8\degree C+0.69\degree C=100.49\degree C\)ANSWER:
The expected elevated boiling point of the solution is 100.49 °C
in a calcium fluoride crystal what is the ratio of calcium ions to fluoride ions
Answers
In a calcium fluoride (CaF2) crystal, the ratio of calcium ions (Ca2+) to fluoride ions (F-) is 1:2. This means that for every one calcium ion, there are two fluoride ions present, maintaining the overall electrical neutrality of the compound.
A calcium fluoride crystal is composed of equal numbers of calcium ions and fluoride ions, with a ratio of 1:1. The crystal structure of calcium fluoride is cubic, and each calcium ion is surrounded by eight fluoride ions, while each fluoride ion is surrounded by four calcium ions. Calcium fluoride is a naturally occurring mineral that is used in various industries, such as metallurgy, glass and ceramics, and dental applications.
It has a high melting point and is highly resistant to thermal shock, making it a useful material for high-temperature applications. In addition, calcium fluoride is known for its optical properties, such as its ability to transmit ultraviolet light, which makes it useful in lenses, prisms, and other optical components. Overall, the 1:1 ratio of calcium ions to fluoride ions in a calcium fluoride crystal is critical to its properties and applications.
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In a calcium fluoride crystal, the ratio of calcium ions to fluoride ions is 1:2. This means that for every calcium ion present in the crystal lattice, there are two fluoride ions.
This ratio is important for understanding the structure and properties of calcium fluoride, which is widely used in optics, dental treatments, and other applications. The crystal lattice of calcium fluoride is composed of positively charged calcium ions (Ca2+) and negatively charged fluoride ions (F-), which form a repeating pattern that gives the crystal its characteristic shape and properties. By understanding the ratio of calcium ions to fluoride ions in the crystal lattice, scientists can better understand and manipulate its properties for various applications.
In a calcium fluoride (CaF2) crystal, the ratio of calcium ions (Ca2+) to fluoride ions (F-) is 1:2. This means that for every one calcium ion, there are two fluoride ions present. This stoichiometric ratio is essential for maintaining charge neutrality in the crystal lattice, as the positive charge of the calcium ion is balanced by the combined negative charges of the two fluoride ions. This ionic compound forms a cubic crystal lattice, resulting in a stable and ordered structure.
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choose the correct structural formula for the alcohol formed in this reaction
Answers
Answer:
The formula is CnH2n+1OH
Explanation:
if the solubility of caffeine in water is 2.2 mg/ml at 25 °c,180 mg/ml at 80 °c, and 670 mg/ml at 100 °c, explain why the first step in the separation is to heat the ground up tablets.
Answers
The first step in the separation is to heat the ground up tablets to increase the solubility of caffeine in water. Heating the ground up tablets increases the solubility of caffeine in water because solubility is dependent on temperature.
As the temperature of the water increases, more solute can be dissolved in the solvent. Therefore, by heating the ground up tablets, the caffeine will dissolve more easily in the water, allowing for separation from other compounds present in the tablet.The solubility of caffeine in water at 25°C is only 2.2 mg/mL, which means that a large amount of water would be required to dissolve caffeine from the tablets. By heating the tablets to a higher temperature, such as 80°C or 100°C, the solubility of caffeine increases dramatically, making it easier to dissolve the caffeine in a smaller amount of water. This makes separation of the caffeine from other compounds more efficient.
Step 1: Heat the mixture
As the temperature of the water increases, the solubility of caffeine also increases. This means that more caffeine can dissolve in water at higher temperatures.
Step 2: Dissolve the caffeine
By heating the ground-up tablets, you are increasing the temperature of the water, allowing more caffeine to dissolve. This ensures that a larger amount of caffeine is separated from the other components in the tablet.
Step 3: Separate the caffeine
Once the caffeine is dissolved in the heated water, it can be more easily separated from the other components in the tablet, leading to a more efficient and effective separation process.
In conclusion, the first step in separating caffeine from ground-up tablets is to heat the mixture because it increases the solubility of caffeine in water, allowing for a more efficient separation process.
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plot the viscosity of water, hexane, and 100 percent glycerol on semilog coordinates, and discuss how nearly the viscosity follows an arrehenius relationship
Answers
Viscosity is a measure of a fluid's resistance to flow. Plotting viscosity on semi-log coordinates allows for the examination of exponential relationships.
On a semi-log plot of viscosity versus temperature, the slope of the line indicates the activation energy for the viscous flow, and a straight line indicates an Arrhenius relationship.
For water, the viscosity decreases with increasing temperature and does not follow an Arrhenius relationship. Hexane also has a decreasing viscosity with temperature, but deviates significantly from an Arrhenius relationship. On the other hand, 100% glycerol has a relatively constant viscosity with temperature, and is an example of a fluid that follows an Arrhenius relationship.
In general, the viscosity of fluids depends on several factors such as molecular weight, intermolecular forces, and temperature. The deviation from an Arrhenius relationship can indicate more complex relationships between viscosity and temperature, such as the existence of multiple temperature-dependent processes that contribute to the overall viscosity of the fluid.
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Which object absorbs the most visible light?a. a clear bowlb. a white rockc. a black t-shirtd. a red apple
Answers
A black t-shirt absorbs the most visible light. This is because black is a color that absorbs all visible light, which is why it appears to be a dark color.
Correct option is A.
When light hits a black t-shirt, the material absorbs the photons, which is why it looks dark and doesn't reflect light like a white t-shirt or a white rock would. When visible light enters a black t-shirt, it is absorbed by the molecules in the material, and is converted into heat. This is why a black t-shirt can feel warmer than other colored t-shirts.
A clear bowl, a white rock and a red apple all reflect visible light, so they don't absorb as much as a black t-shirt. All these objects are able to absorb some visible light, but a black t-shirt absorbs the most. A black t-shirt absorbs more visible light than any other object because it is a darker color, and darker colors absorb more light.
Correct option is A.
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please someone do the underlined question !!! Ill do anything ASAP
Answers
For the reaction, we have that;
2NaOH + H2SO4 -----> Na2SO4 + 2H2O
What is a balanced reaction equation?A balanced reaction equation is a chemical equation that accurately represents the reactants and products in a chemical reaction, where the number of atoms of each element on the reactant side is equal to the number of atoms of that element on the product side.
In other words, a balanced equation follows the law of conservation of mass, which states that the total mass of the reactants must be equal to the total mass of the products in a chemical reaction.
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what is the level of efficacy of your preponderant dishwashing liquid?
Answers
The level of efficacy of your preponderant dishwashing liquid is highly dependent on its chemical makeup and concentration.
Generally, the higher the concentration of active ingredients, the higher the efficacy of the product.The level of efficacy of my preponderant dishwashing liquid is very high. It is specifically designed to effectively clean dishes and remove tough stains and grease. Its powerful formula ensures that dishes are left sparkling clean with minimal effort.
The dishwashing liquid has been rigorously tested to ensure its efficacy and is consistently found to be highly effective at cleaning dishes.
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If you increase the amount of Reactant A, the reaction rate will also increase.
What is this statement an example of?
A. A theory
B. An observation
C. A hypothesis
D. A scientific question
Answers
Which of the following best describes the Valence Shell Electron Pair Repulsion Theory (VSEPR)?
Answers
Answer:
Electron pairs are arranged as far apart from each other as possible.
Explanation:
Like charges repel therefore, VSEPR theory is the "...repulsions between electron pairs present in the valence shell of the central atom."
as the pressure on a pure substance is increased at constant temperature, a phase transition (if any) which is not observed would be
Answers
The phase transition that takes place when the pressure on a pure subsatnce is increased at a constant temperature is liquid to solid.
Raising the pressure increases the melting factor of maximum solids. That's why the melting factor line slopes ahead for maximum substances. Moving from stable to liquid with the aid of using converting the stress: You also can mess around with this with the aid of using searching at what takes place in case you lower the stress on a stable at consistent temperature. At standard conditions as temperature increases, maximum materials extrude from solid to liquid to gas, and at trendy temperature as strain increases, maximum materials change from gas to liquid to solid.
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C6 h12o6 6o2 adp pi 6co2 6 h2o molecule a heat the molecule referred to as ""molecule a"" in the equation above is:_________
a. atp.
b. nadph.
c. nadh.
d. adp.
Answers
The "molecule a" referred to ATP in the equation.
So, option A is correct one.
The equation is given as,
\(C_{6} H_{12} O_{6}+ 6O_{2}\) → \(6CO_{2}+ 6H_{2}O + ATP\)
The above equation indicates the respiration activities in the plants.
The aerobic respiration takes place in the Mitochondria and which requires oxygen and glucose and produces carbon dioxide , water and energy.
The energy is in the form of ATP. The pull form of ATP is adenosine triphosphate. The ATP is also called energy carrier because it found in the cells of the all living organism and this molecule carries energy.
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A system contains 100 g of oxygen. How many moles does it
contain? How many molecules?
Answers
The system contains 3.125 moles of oxygen and 1.88 x 10^24 molecules of oxygen.
To determine the number of moles and molecules in a system containing 100 g of oxygen, we need to use the molar mass of oxygen and Avogadro's number.
The molar mass of oxygen (O2) is approximately 32 g/mol.
To calculate the number of moles of oxygen, we divide the given mass by the molar mass:
Number of moles = Mass / Molar mass = 100 g / 32 g/mol ≈ 3.125 moles
Therefore, the system contains approximately 3.125 moles of oxygen.
To find the number of molecules, we can use Avogadro's number, which is approximately 6.022 x 10^23 molecules per mole.
Number of molecules = Number of moles × Avogadro's number
= 3.125 moles × 6.022 x 10^23 molecules/mol
≈ 1.88 x 10^24 molecules
Thus, the system contains approximately 3.125 moles of oxygen and approximately 1.88 x 10^24 molecules of oxygen.
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what are the molecular and empirical chemical formulas of a compound made up of these molecules? iron 70.0 oxygen 30.1
Answers
The empirical formula of the compound made up of 70.0% iron and 30.1% oxygen is Fe₂O₃, and the molecular formula can be the same as the empirical formula, Fe₂O₃.
To determine the empirical formula, we need to find the simplest whole-number ratio of the elements present in the compound. Given the percentages of iron (Fe) and oxygen (O), we can assume a 100 g sample of the compound.
The mass of iron is 70.0 g (70.0% of 100 g), and the mass of oxygen is 30.1 g (30.1% of 100 g).
Next, we calculate the moles of each element using their respective molar masses:
moles of Fe = 70.0 g / 55.85 g/mol ≈ 1.252
moles of O = 30.1 g / 16.00 g/mol ≈ 1.881
Then, we divide the number of moles of each element by the smallest number of moles to obtain the simplest whole-number ratio:
1.252 / 1.252 ≈ 1 (for Fe)
1.881 / 1.252 ≈ 1.5 (for O)
Since we need to express the empirical formula using whole numbers, we multiply the ratio by 2 to obtain the simplest ratio:
1 × 2 = 2 (for Fe)
1.5 × 2 = 3 (for O)
Therefore, the empirical formula of the compound is Fe₂O₃, and the molecular formula can be the same as the empirical formula, Fe₂O₃.
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keep it simple i need helppppp
Answers
Answer: I believe it is 4
Explanation:
How much acetic acid (ch3cooh) in grams, would be required to make 1 liter of a 1.5 m acetic acid solution in water?
Answers
The amount of acetic acid (CH₃COOH) in grams needed to prepare the solution is 90
What is molarity?This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the mole of CH₃COOHMolarity = 1.5 MVolume = 1 L Mole of CH₃COOH =?Molarity = mole / Volume
Cross multiply
Mole = Molarity × Volume
Mole of CH₃COOH = 1.5 × 1
Mole of CH₃COOH = 1.5 mole
How to determine the mass of CH₃COOHMole of CH₃COOH = 1.5 moleMolar mass of CH₃COOH = 60 g/mol Mass of CH₃COOH =?Mole = mass / molar mass
Cross multiply
Mass = mole × molar mass
Mass of CH₃COOH = 1.5 × 60
Mass of CH₃COOH = 90 g
Thus, 90 g of CH₃COOH is needed to prepare the solution
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2. four bulbs connoted in parallel controlled by a single pole switch using
alternating current
Answers
Answer
I think there should be two poles, a north pole and a south pole. so this statement is wrong
Imagine two pure samples of gas in identical closed containers: sample A and sample B.
Sample A has a higher temperature than sample B.
Each of the statements below is true about the samples. Which statements describe a
property that contributes to the difference in temperature? Select all that apply.
The total mass of sample A is higher than the
total mass of sample B.
The particles in sample A have a higher average
speed than the particles in sample B.
Each particle in sample A has more mass than
each particle in sample B.
Answers
The statements that contributes to the difference in temperature are the particles in Sample A have a higher average speed than the particles in sample B and Each particle in sample A has more mass than each particle in sample B and the correct options are option 2 and 3.
In Kinetic Theory of Gas, we assume speed of a gas molecule to be constant at constant temperature.
If it collides with walls of the container or with other molecules, then its speed remain constant and direction reverses as collision is assumed to be elastic.
The average velocity of gas molecules is the speed at which they move around in a space. This can be affected by various factors such as temperature, pressure, and the type of gas.
The average velocity is important because it determines how fast a gas will expand or contract in response to changes in these conditions.
Thus, the ideal selections are option 2 and 3.
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