# Ideal Gases

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## Ideal Gases Answer Key

1.

What Kelvin temperature is equal to 25°C?

- 248K
- 298K
- 100K
- 200K

2.

What is the name for a theoretical gas composed of a set of randomly moving, non-interacting point particles, wherein all collisions between atoms or molecules are perfectly elastic and in which there are no intermolecular attractive forces?

- random gas
- ideal gas
- inert gas
- particle gas

3.

Under what conditions do real gases behave almost like ideal gases?

- high temperature, low pressure
- high temperature, high pressure
- low temperature, high pressure
- low temperature, low pressure

4.

The ideal gas law is expressed by the equation [math]PV=nRT[/math].

5.

What is the SI unit for pressure?

- newton
- joule
- Kelvin
- pascal

6.

In the equation for the ideal gas law, [math]PV=nRT[/math], what does [math]n[/math] represent?

- Newton
- number of molecules
- number of moles
- gas constant

7.

In the equation for the ideal gas law, [math]PV=nRT[/math], which is the universal gas constant?

- P
- V
- T
- R

8.

A gas sample has a volume of 1.5 liters when the thermometer on the wall reads 25°C. What volume will it occupy if it is warmed to 100°C?

- 1.9 liters

9.

A gas has a pressure of 655 mmHg at [math]25 degC[/math]. To what temperature must it be heated in order to raise its pressure to 825 mmHg?

- 105 C (378 K)

10.

If you were to apply heat to a gas sample with a volume of 2.0 liters starting from 26°C and stopping at 100°C, what would be its volume when you stop heating the sample?

- 2.5 liters

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