# Effusion and Diffusion

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## Effusion and Diffusion Answer Key

1.

Which of the following correctly describes effusion?

- The movement of a gas into an area of higher pressure, always
- The movement of a gas into a vacuum
- The mixing of gases
- None of the above

2.

Which of the following correctly describes diffusion?

- The movement of gases into an area of higher pressure, always
- The movement of gases into a vacuum
- The mixing of gases
- Both (a) and (b)

3.

Which of the following equations correctly demonstrates Graham's Law of Diffusion and Effusion?

- [math]{"Rate of effusion of gas 1"}/{"Rate of effusion of gas 2"} = √{MW_1}/{MW_2}[/math]
- [math]{"Rate of effusion of gas 1"}/{"Rate of effusion of gas 2"} = √{MW_2}/{MW_1}[/math]
- [math]{"Rate of effusion of gas 1"}/{"Rate of effusion of gas 2"} = {MW_1}/{MW_2}[/math]
- [math]{"Rate of effusion of gas 1"}/{"Rate of effusion of gas 2"} = {MW_2}/{MW_1}[/math]

4.

Which of the following correctly describes Graham's Law?

- Rates of effusion are directly proportional to the molecular weights of the two gases
- Rates of effusion are directly proportional to the square root of the molecular weights of the two gases
- Rates of effusion are inversely proportional to the molecular weights of the two gases
- Rates of effusion are inversely proportional to the square roots of the molecular weights of the two gases

5.

Which of the following correctly describes the relationship between the speed of gas diffusion and absolute temperature?

- The speed of gas diffusion is directly proportional to absolute temperature
- The speed of gas diffusion is inversely proportional to absolute temperature
- The speed of gas diffusion is directly proportional to the square root of absolute temperature
- The speed of gas diffusion is inversely proportional to the square root of absolute temperature

6.

The ratio of the speed of helium to gas X is 16:1. What is the molar mass of gas X?

- 1024 g/mol
- 256 g/mol
- 128 g/mol
- 64 g/mol

7.

The ratio of the speed of neon to gas X is 3:1. What is the molar mass of gas X?

- 160 g
- 60 g
- 180 g
- 240 g

8.

The molecular mass of gas X is 320 g/mol. The other gas is neon. What is the ratio of the speed of neon to that of gas X?

- 1:4
- 4:1
- 2:1
- 1:2

9.

Summarize the differences between diffusion and effusion, in terms of pressure.

- Diffusion occurs under conditions of constant pressure, while effusion occurs as a result of a pressure difference.

10.

Pressure changes from an area of lower pressure to higher pressure near Earth's surface.

- True
- False

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