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A2 physics OCR

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OCR Physics - Thermal Physics

Question 1 of 3

1

Which of these are the two assumptions of the kinetic theory?

Select one of the following:

Matter is made up of molecules and the molecules are small.
Matter is made up of particles and the particles tend to be small.
Matter is made up of particles and the particles tend to move around.
Matter is made up of molecules and the molecules tend to move around.

Explanation

Question 2 of 3

1

Tick the 3 properties of a gas.

Select one or more of the following:

The separation between molecules is large.
They have very small electric potential energy.
They have a large kinetic energy.
They cause pressure in a container by colliding with the walls.

Explanation

Question 3 of 3

1

Fill the blank spaces to complete the text.

Brownian motion is the and erratic motion of molecules in the air. It provides the evidence for the presence of in the air which are too to see. Experiments using smoke grains allows us to deduce that gases in the air must be moving much than the smoke grains.

Explanation