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Quiz about Gases Are All Around Us
Quiz about Gases Are All Around Us

Gases Are All Around Us! Trivia Quiz


Gases are all around us, but how well do you know them? This quiz covers their properties, the kinetic theory, the collision theory and their transport phenomena as well. Best of luck and enjoy!

A multiple-choice quiz by Matthew_07. Estimated time: 8 mins.
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Author
Matthew_07
Time
8 mins
Type
Multiple Choice
Quiz #
279,576
Updated
Dec 03 21
# Qns
10
Difficulty
Tough
Avg Score
6 / 10
Plays
3712
Last 3 plays: slay01 (10/10), Guest 75 (1/10), Guest 176 (9/10).
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Question 1 of 10
1. Different gases have different equations of states, which are the equations that interrelate pressure (P), volume (V), temperature (T) and number of moles (n) of the gases that we are interested in. The most famous one is the equation of state PV = nRT which is used to describe the behavior of ideal gases. What is the name given to the constant R? Hint


Question 2 of 10
2. As opposed to the ideal or perfect gases, real gases do not obey the equation of state PV = nRT. Real gases may obey more complicated equations of states which involve more parameters and constants, for example, the famous van der Waals equation, [P+(an)^2/V^2][V-nb]=nRT, where P = pressure, V = volume, n = number of moles, R = proportionality constant, T = temperature, a & b = van der Waals constants. Nonetheless, real gases DO obey the ideal gases' equation of state under certain conditions. What are the criteria? Hint


Question 3 of 10
3. The compression factor, Z is a convenient way to measure the degree of deviation of a real gas from ideal behavior. The formula is given by Z = V1/V2, where V1 is the volume that is occupied by 1 mole of the real gas, while V2 is the volume that is occupied by an ideal gas, at the same temperature and pressure. When Z = 1, we say that the gas is behaving ideally. However, if we get the value of Z to be less than 1, we can say that the _____ forces are dominant in the sample of real gas. What goes in the blank? Attractive or repulsive? (Hint: When attractive forces are dominant, the gas can be compressed more easily. On the contrary, the gas is more difficult to be compressed when repulsive forces are dominant)

Answer: (Type A for attractive or R for repulsive)
Question 4 of 10
4. By using the ideal gases as a model, scientists have proposed the kinetic theory of gases. This theory is based on 3 assumptions. Which of the following is NOT one of them? Hint


Question 5 of 10
5. The condensation of gas into liquid form is possible because of the existence of intermolecular attractive forces within the gas molecules. Now, if we do some differentiation to the equation of state (pressure, P with respect to volume, V), we may obtain an inflection point. At this critical (inflection) point, we can know the critical temperature of the gas. The critical temperature is the _____ temperature where the condensation of gas is possible. What goes in the blank? Lowest or highest? (Hint: Keep in mind that the gas will only condense at very low temperature)

Answer: (Type L for lowest or H for highest)
Question 6 of 10
6. The Maxwell distribution of speeds of gas molecules are given by a very complicated formula. If the graph F(v) against speed is plotted, we will get an unsymmetrical bell shape curve on the first (upper right) quadrant. Apart from the molecular mass of the gas, what other factor will influence the shape of the graph? Hint


Question 7 of 10
7. From the Maxwell distribution graph, we can have 3 types of speeds. The first one is the most probable speed, V1, which is the maximum speed which occurs at the peak of the graph. The second one is the mean speed, V2. As the name implies, V2 is the average speed of all the gas molecules. Last but not least is the root mean square speed, V3. Their formulae are given by V1 = surd (2RT/M), V2 = surd (8RT/pi M) and V3 = surd (3RT/M), where R = proportionality constant, T = temperature, M = molar mass. Which of the following is the CORRECT inequality that relates these 3 speeds? (Hint: compare the numerical terms in the three formulae, you can cancel out all the variables) Hint


Question 8 of 10
8. The collision theory is very important because it affects the rate of chemical reaction. Generally, there are 2 types of collision, namely collision of similar molecules and of different molecules. Two important terms involved here are collision frequency and collision density. The former is the number of collisions made by one gas molecule per unit time, while the latter is defined as the number of collisions made by ALL of the gas molecules per unit volume per unit time. Assume all the gas are contained in separate container of the same volume and temperature, which of the following gas will have the greatest collision frequency? (Note that hydrogen is lighter than oxygen) Hint


Question 9 of 10
9. You might have heard of the term "viscosity" of liquid, where a liquid with higher viscosity, such as oil, will move or travel slower than another liquid of lower viscosity, such as vinegar. Well, viscosity applies to gases as well. It is defined as the migration of linear momentum down a velocity gradient. What is the unit for viscosity? Hint


Question 10 of 10
10. Approximately 21% of the air around us at the sea level is oxygen, O2 while 0.04% is carbon dioxide, CO2. Which of the following gases constitutes 78% of the air? Hint



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quiz
Quiz Answer Key and Fun Facts
1. Different gases have different equations of states, which are the equations that interrelate pressure (P), volume (V), temperature (T) and number of moles (n) of the gases that we are interested in. The most famous one is the equation of state PV = nRT which is used to describe the behavior of ideal gases. What is the name given to the constant R?

Answer: The gas constant

The values of the gas constant, R is experimentally determined to be 8.314 J mol^-1 K^-1.

The equation of state PV = nRT is actually derived from other laws, namely Boyle's law (relates pressure and volume), Charles's law (relates volume and temperature), Gay Lussac's law (relates pressure and temperature) and Avogadro's law (relates volume and number of moles).
2. As opposed to the ideal or perfect gases, real gases do not obey the equation of state PV = nRT. Real gases may obey more complicated equations of states which involve more parameters and constants, for example, the famous van der Waals equation, [P+(an)^2/V^2][V-nb]=nRT, where P = pressure, V = volume, n = number of moles, R = proportionality constant, T = temperature, a & b = van der Waals constants. Nonetheless, real gases DO obey the ideal gases' equation of state under certain conditions. What are the criteria?

Answer: Low pressure and high temperature

At low pressure and high temperature, real gases' particles are far apart from each other. This is the same conditions that are exhibited by ideal or perfect gases.

In the van der Waals equation, [P+(an)^2/V^2][V-nb]=nRT, the corrections are made to account for the intermolecular forces between gas particles.
3. The compression factor, Z is a convenient way to measure the degree of deviation of a real gas from ideal behavior. The formula is given by Z = V1/V2, where V1 is the volume that is occupied by 1 mole of the real gas, while V2 is the volume that is occupied by an ideal gas, at the same temperature and pressure. When Z = 1, we say that the gas is behaving ideally. However, if we get the value of Z to be less than 1, we can say that the _____ forces are dominant in the sample of real gas. What goes in the blank? Attractive or repulsive? (Hint: When attractive forces are dominant, the gas can be compressed more easily. On the contrary, the gas is more difficult to be compressed when repulsive forces are dominant)

Answer: A

When attractive forces are dominant in a sample of gas, the gas molecules are closer and hence, they occupy a smaller volume. Therefore V1 will be less than V2 and we get our compression factor, Z to be less than 1.

On the other hand, when repulsive forces are dominant, the gas molecules will repel each other, resulting in a greater volume which is occupied by the gas. Therefore, V1 will be greater than V2. Hence, the value of Z will be greater than 1.
4. By using the ideal gases as a model, scientists have proposed the kinetic theory of gases. This theory is based on 3 assumptions. Which of the following is NOT one of them?

Answer: The gas molecules will never collide with the wall of the containers.

In fact, gas molecules are in ceaseless random motion, so they will either collide with other molecules or with the wall of the containers. This results in pressure.

Keep in mind that the characteristics of gases are totally different things compared to these 3 assumptions.

These assumptions are made so that scientists can derive useful mathematical equations that describe the behavior of gas more easily.

In other words, we can imagine each gas particle as a hard, impenetrable golf ball.
5. The condensation of gas into liquid form is possible because of the existence of intermolecular attractive forces within the gas molecules. Now, if we do some differentiation to the equation of state (pressure, P with respect to volume, V), we may obtain an inflection point. At this critical (inflection) point, we can know the critical temperature of the gas. The critical temperature is the _____ temperature where the condensation of gas is possible. What goes in the blank? Lowest or highest? (Hint: Keep in mind that the gas will only condense at very low temperature)

Answer: H

This may be a bit confusing but let's us take a look at the explanation.

Let say the critical temperature of a gas A is 100 Kelvin. Then, we say that 100 K is the highest temperature where the condensation of gas A is possible. Of course, when we condense the gas under 50 K (lower than the critical temperature), the gas will liquefy. But if higher temperature, let say 200 K is applied, then the gas will not liquefy. Instead, the gas molecules will move further apart because of the energy provided. At lower temperature, the gas molecules slow down and move closer towards each other.
6. The Maxwell distribution of speeds of gas molecules are given by a very complicated formula. If the graph F(v) against speed is plotted, we will get an unsymmetrical bell shape curve on the first (upper right) quadrant. Apart from the molecular mass of the gas, what other factor will influence the shape of the graph?

Answer: Temperature

A gas with higher molecular mass and low temperature will result in higher peak. On the contrary, a gas with lower molecular mass and high temperature will have lower peak and the bell is more widely spread.

In addition, the total area under the curve is 1.
7. From the Maxwell distribution graph, we can have 3 types of speeds. The first one is the most probable speed, V1, which is the maximum speed which occurs at the peak of the graph. The second one is the mean speed, V2. As the name implies, V2 is the average speed of all the gas molecules. Last but not least is the root mean square speed, V3. Their formulae are given by V1 = surd (2RT/M), V2 = surd (8RT/pi M) and V3 = surd (3RT/M), where R = proportionality constant, T = temperature, M = molar mass. Which of the following is the CORRECT inequality that relates these 3 speeds? (Hint: compare the numerical terms in the three formulae, you can cancel out all the variables)

Answer: V1 < V2 < V3

Notice that surd 2 is less than surd (8/pi), which is less than surd 3.

So, we will obtain the inequality where the most probable speed is less than the mean speed, which is less than the root mean square speed.
8. The collision theory is very important because it affects the rate of chemical reaction. Generally, there are 2 types of collision, namely collision of similar molecules and of different molecules. Two important terms involved here are collision frequency and collision density. The former is the number of collisions made by one gas molecule per unit time, while the latter is defined as the number of collisions made by ALL of the gas molecules per unit volume per unit time. Assume all the gas are contained in separate container of the same volume and temperature, which of the following gas will have the greatest collision frequency? (Note that hydrogen is lighter than oxygen)

Answer: 2 moles of oxygen

We can deduce the answer by some logic thinking. Heavier gas will have larger gas molecule's diameter, and hence, they are more likely to collide with each other.

Moreover, 2 moles of oxygen in a container will sure collide more frequently then 1 mole of oxygen in another container of the same volume.

If you are interested, the formula of collision frequency is given by Z = (surd 2) V2 pi d^2 p, where V2 is the mean speed, d is the diameter of the gas molecule and p (rho) is the gas density (in terms of partial pressure). We can see from this formula that the collision frequency is directly proportional to the diameter and density of the gas.
9. You might have heard of the term "viscosity" of liquid, where a liquid with higher viscosity, such as oil, will move or travel slower than another liquid of lower viscosity, such as vinegar. Well, viscosity applies to gases as well. It is defined as the migration of linear momentum down a velocity gradient. What is the unit for viscosity?

Answer: Poise (P)

1 poise is 0.1 kg m^-1 s^-1.

Pascal is the unit for pressure. On the other hand, Joule and Ampere are units for energy and electrical current respectively.
10. Approximately 21% of the air around us at the sea level is oxygen, O2 while 0.04% is carbon dioxide, CO2. Which of the following gases constitutes 78% of the air?

Answer: Nitrogen, N2

The remaining 2% are inert gases such as argon, Ar, neon, Ne and krypton, Kr.

Phew, now that you have finished the quiz, I suggest you taking a deep breath, and appreciate their existence in our earth's atmosphere.

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I hope you enjoyed playing this quiz, and learn something new as well. Any feedback or comments are most welcomed. Thanks for playing and have a nice day!
Source: Author Matthew_07

This quiz was reviewed by FunTrivia editor crisw before going online.
Any errors found in FunTrivia content are routinely corrected through our feedback system.
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