Chemistry: Gas Laws

Front

What creates pressure?

Back

gas molecules colliding with container walls

Answer explanation

Pressure is created when gas molecules collide with the walls of their container. These collisions exert force on the walls, resulting in pressure. The other options do not directly cause pressure in this context.

Front

What is the mathematical expression for Boyle's Law?

Back

Answer explanation

Boyle's Law states that the product of pressure and volume is constant for a given amount of gas at constant temperature. Thus, the correct expression is P1V1 = P2V2, which shows the relationship between initial and final states.

Front

When using Charles' Law, if you double volume, what happens to temperature?

Back

it is doubled also

Answer explanation

According to Charles' Law, if the volume of a gas is doubled at constant pressure, the temperature must also double to maintain the relationship between volume and temperature. Thus, the correct answer is that temperature is doubled also.

Front

What temperature scale must we use in the Gas Laws?

Back

Kelvin

Answer explanation

In Gas Laws, temperature must be measured in Kelvin because it is an absolute scale that starts at absolute zero, ensuring accurate calculations of gas behavior. Other scales like Celsius and Fahrenheit are not suitable.

Front

How many kpa are in 1.01 bar?

Back

101.3

Answer explanation

1 bar is equivalent to 101.3 kPa. Therefore, 1.01 bar equals 1.01 x 101.3 kPa, which is approximately 102.7 kPa. However, the question asks for the conversion of 1 bar, which is 101.3 kPa.

Front

How do we measure an increase in kinetic energy?

Back

temperature

Answer explanation

Kinetic energy is related to the motion of particles, which increases with temperature. As temperature rises, particles move faster, indicating an increase in kinetic energy. Thus, temperature is the correct measure.

Front

What happens to pressure as we increase kinetic energy?

Back

it increases

Answer explanation

As kinetic energy increases, particles move faster, leading to more frequent and forceful collisions with surfaces. This results in an increase in pressure, making 'it increases' the correct choice.

Front

If you place a balloon in a refrigerator, what will happen to the volume?

Back

It will decrease.

Answer explanation

When a balloon is placed in a refrigerator, the temperature decreases. According to Charles's Law, the volume of a gas decreases as temperature decreases, so the volume of the balloon will decrease.

Front

Why does the volume decrease in the previous question?

Back

because temperature and pressure decrease with a decrease in kinetic energy and collisions

Answer explanation

The volume decreases because lower kinetic energy leads to fewer and less forceful collisions among molecules, resulting in decreased temperature and pressure.

Front

What gas law should you use to describe the balloon in the last two questions?

Back

Combined Gas Law

Answer explanation

The Combined Gas Law is appropriate as it relates pressure, volume, and temperature of a gas simultaneously, which is essential for understanding the behavior of the balloon in the context of the previous questions.