Gases: Unit 5 Quiz

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What is the formula to find the density of a gas?

K.E. = 1/2mv^2

d = m/V (correct)

MW = mass/n

PV = nRT

What is the unit of R in the ideal gas law equation PV = nRT?

L atm/mol^2 K

L atm/mol K

L kPa/mol K (correct)

L kPa/mol^2 K

What is the temperature in Kelvin at standard temperature and pressure (STP)?

273 K (correct)

298 K

293 K

300 K

A gas is pumped into a rigid container at 0°C and 1.0 atm. If the volume of the container is 8.0 L, what is the total pressure in the container?

2.5 atm Signup and view all the answers

A sample of gas does not behave ideally. Which of the following is the best explanation?

The molecules are attracted to each other Signup and view all the answers

Under which of the following conditions will H2 gas behave most like an ideal gas?

500 K and 0.10 atm Signup and view all the answers

A mixture of CO(g) and H2(g) is pumped into a 2.0 L reaction vessel. If the total pressure is 1.2 atm, what will be the total pressure if the volume is reduced to 1.0 L at constant temperature?

2.4 atm Signup and view all the answers

What is the formula to relate the temperature in Celsius to the temperature in Kelvin?

T(K) = T(°C) + 273 Signup and view all the answers

What can be concluded about the intermolecular forces of CHCl3 and water based on their vapor pressures at 40°C?

Water has weaker intermolecular forces than CHCl3. Signup and view all the answers

If H2O, CHCl3, and CCl4 are sprayed on a blackboard, which one would evaporate the fastest?

CHCl3 Signup and view all the answers

What is the pressure of a gas in a barometer that reads 786 mm Hg?

0.97 atm Signup and view all the answers

What happens to the pressure inside an open flask filled with air when it is heated?

The pressure increases. Signup and view all the answers

How much of which gas can a 2-L container hold at STP?

7g of N2 Signup and view all the answers

What can be said about the vapor pressure of CHCl3 at 40°C compared to water?

CHCl3 has a higher vapor pressure than water. Signup and view all the answers

What happens to the pressure of a gas when it is heated at constant volume?

The pressure increases. Signup and view all the answers

Which of the following is a direct consequence of the vapor pressure of a substance?

Its boiling point. Signup and view all the answers

What is the main reason why the pressure inside the flask cannot be determined without knowing the air pressure?

The air pressure outside the flask affects the pressure inside Signup and view all the answers

According to the vapor pressure graph, which substance has the lowest vapor pressure at 40 °C?

H2O Signup and view all the answers

Which substance would evaporate the fastest if sprayed on the blackboard?

CHCl3 Signup and view all the answers

What is true about the average kinetic energy of argon, oxygen, and helium at 300K?

All three gases will have the same average kinetic energy Signup and view all the answers

What is an example of effusion?

A tire slowly leaking air through a pinhole puncture Signup and view all the answers

What happens to the average kinetic energy of a gas as its temperature decreases?

It decreases Signup and view all the answers

At 40°C, which substance has the highest vapor pressure?

CHCl3 Signup and view all the answers

What is the molar mass of a gaseous fluorinated methane compound if it has a density of 4.0 g/L at 1.90 atm and 28°C?

52.03 g/mol Signup and view all the answers

What is the pressure inside a 1.0 L picture tube that contains 2.1×10–7 moles of N2 gas at 17°C?

5.0*10^-6 atm Signup and view all the answers

Which of the following statements is true about the relationship between temperature and intermolecular forces?

As temperature increases, intermolecular forces decrease Signup and view all the answers

What will be the volume of a gas at STP (1 atm, 0°C) if its volume is 35 L at 50 kPa and 90°C?

13.0 L Signup and view all the answers

What will be the pressure of O2 if 1.4 atm of ozone O3 decomposes to oxygen gas, O2 at 300K?

2.1 atm Signup and view all the answers

If we sprayed H2O, CHCl3, and CCl4 on the blackboard, which would you expect to evaporate the fastest?

CHCl3 Signup and view all the answers

If a 2.0 L bottle is filled with 0.25 moles of CO2 at a pressure of 3 atm, what will be the total pressure in the bottle if 10.0 g of argon is added?

4 atm Signup and view all the answers

If a 2.0 L bottle is filled with 0.25 moles of CO2 at a pressure of 3 atm, what will be the partial pressure of CO2 if 10.0 g of argon is added?

3 atm Signup and view all the answers

Gases: Unit 5 Quiz

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Questions and Answers

What is the formula to find the density of a gas?

What is the unit of R in the ideal gas law equation PV = nRT?

What is the temperature in Kelvin at standard temperature and pressure (STP)?

A gas is pumped into a rigid container at 0°C and 1.0 atm. If the volume of the container is 8.0 L, what is the total pressure in the container?

A sample of gas does not behave ideally. Which of the following is the best explanation?

Under which of the following conditions will H2 gas behave most like an ideal gas?

A mixture of CO(g) and H2(g) is pumped into a 2.0 L reaction vessel. If the total pressure is 1.2 atm, what will be the total pressure if the volume is reduced to 1.0 L at constant temperature?

What is the formula to relate the temperature in Celsius to the temperature in Kelvin?

What can be concluded about the intermolecular forces of CHCl3 and water based on their vapor pressures at 40°C?

If H2O, CHCl3, and CCl4 are sprayed on a blackboard, which one would evaporate the fastest?

What is the pressure of a gas in a barometer that reads 786 mm Hg?

What happens to the pressure inside an open flask filled with air when it is heated?

How much of which gas can a 2-L container hold at STP?

What can be said about the vapor pressure of CHCl3 at 40°C compared to water?

What happens to the pressure of a gas when it is heated at constant volume?

Which of the following is a direct consequence of the vapor pressure of a substance?

What is the main reason why the pressure inside the flask cannot be determined without knowing the air pressure?

According to the vapor pressure graph, which substance has the lowest vapor pressure at 40 °C?

Which substance would evaporate the fastest if sprayed on the blackboard?

What is true about the average kinetic energy of argon, oxygen, and helium at 300K?

What is an example of effusion?

What happens to the average kinetic energy of a gas as its temperature decreases?

At 40°C, which substance has the highest vapor pressure?

What is the molar mass of a gaseous fluorinated methane compound if it has a density of 4.0 g/L at 1.90 atm and 28°C?

What is the pressure inside a 1.0 L picture tube that contains 2.1×10–7 moles of N2 gas at 17°C?

Which of the following statements is true about the relationship between temperature and intermolecular forces?

What will be the volume of a gas at STP (1 atm, 0°C) if its volume is 35 L at 50 kPa and 90°C?

What will be the pressure of O2 if 1.4 atm of ozone O3 decomposes to oxygen gas, O2 at 300K?

If we sprayed H2O, CHCl3, and CCl4 on the blackboard, which would you expect to evaporate the fastest?

If a 2.0 L bottle is filled with 0.25 moles of CO2 at a pressure of 3 atm, what will be the total pressure in the bottle if 10.0 g of argon is added?

If a 2.0 L bottle is filled with 0.25 moles of CO2 at a pressure of 3 atm, what will be the partial pressure of CO2 if 10.0 g of argon is added?

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