1.4 A closer look at gases Flashcards

1
Q

What is gas pressure?

A

Gas pressure is the name given to the force exerted by gas particles colliding with the wall of their container.

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2
Q

What happens when you heat a gas in a closed container?

A

When you heat a gas in a closed container, its pressure increases.

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3
Q

Why does the pressure increase when you heat a gas?

A

This is because the particles take in heat energy and move faster. They hit the walls more often, and with more force, so the gas pressure increases.

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4
Q

What happens when you squeeze a gas into a smaller space?

A

When a gas is compressed into a smaller space, its pressure increases.

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5
Q

Why does the pressure increase when you compress a gas?

A

This is because the particles are now in a smaller space so they hit the walls more often.

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6
Q

What are the two factors affecting the rate of diffusion of gases?

A

The mass of the particles and the temperature.

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7
Q

How does the mass of the particles affect the rate of diffusion?

A

The lower the mass of the particles, the faster a gas will diffuse.

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8
Q

Why does a gas diffuse faster if the mass of its particles is lower?

A

When particles collide and bounce away, the lighter particles will bounce further.

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9
Q

What is relative molecular mass?

A

The particles in two gases are molecules. The mass of a molecule is called its relative molecular mass.

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10
Q

How does relative molecular mass affect the rate of diffusion of gases?

A

The lower its relative molecular mass, the faster a gas will diffuse.

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11
Q

How does temperature affect the rate of diffusion in gases?

A

The higher the temperature, the faster a gas will diffuse.

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12
Q

Why do gases diffuse faster when the temperature is higher?

A

When a gas is heated, its particles take in heat energy, and move faster. They collide with more energy, and bounce further away.

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