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Which of the following is NOT a sub-atomic particle?

Electron.

Proton.

Nucleus.

Neutron.

An atom is made up of two main parts which are:

The mass number and atomic number.

The nucleus and electron cloud.

Protons and electrons.

Protons and neutrons.

The existence of protons was demonstrated by?

J.J. Thomson.

James Chadwick.

Sir William Crookes.

Ernest Rutherford.

What is the primary difference between a chemical change and a physical change?

Physical changes are reversible, chemical changes are not.

Physical changes involve a change in temperature, chemical changes do not.

Chemical changes involve a change in state, physical changes do not.

Chemical changes result in new substances, physical changes do not.

How does increasing temperature affect the rate of diffusion?

Decreases the rate.

Stops diffusion.

Has no effect.

Increases the rate.