1.4 A closer look at gases Flashcards
What is gas pressure?
Gas pressure is the name given to the force exerted by gas particles colliding with the wall of their container.
What happens when you heat a gas in a closed container?
When you heat a gas in a closed container, its pressure increases.
Why does the pressure increase when you heat a gas?
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.
What happens when you squeeze a gas into a smaller space?
When a gas is compressed into a smaller space, its pressure increases.
Why does the pressure increase when you compress a gas?
This is because the particles are now in a smaller space so they hit the walls more often.
What are the two factors affecting the rate of diffusion of gases?
The mass of the particles and the temperature.
How does the mass of the particles affect the rate of diffusion?
The lower the mass of the particles, the faster a gas will diffuse.
Why does a gas diffuse faster if the mass of its particles is lower?
When particles collide and bounce away, the lighter particles will bounce further.
What is relative molecular mass?
The particles in two gases are molecules. The mass of a molecule is called its relative molecular mass.
How does relative molecular mass affect the rate of diffusion of gases?
The lower its relative molecular mass, the faster a gas will diffuse.
How does temperature affect the rate of diffusion in gases?
The higher the temperature, the faster a gas will diffuse.
Why do gases diffuse faster when the temperature is higher?
When a gas is heated, its particles take in heat energy, and move faster. They collide with more energy, and bounce further away.
