chemistry revision

What is a solid?

• particles that are tightly compacted

• particles that are not tightly compacted

what is a liquid?

• a substance that flows freely but is of constant volume

• a substance or matter in a state in which it will expand freely

• firm and stable in shape

what is a gas?

• a substance or matter in a state in which it will expand freely to fill the whole of a container

• the basic unit of a chemical element

• an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.

Molecules are always moving no matter what phase they are in: solid, liquid, gas.

• True

• False

When a substance melts, the kinetic energy _____________.

• decreases
• stays the same
• increases
• decreases then increases

Anything that takes up space and has mass is

• Matter

• Volume

• Liquid

• Atom

One similarity between solids, liquids and gases is

• all three have atoms and molecules

• all three have molecules that are close together

• all three take the shape of their containers

Subatomic particles with a negative charge

• Electrons

• Neutrons

• Protons

• Quarks

Subatomic particles with a positive charge

• neutrons
• atomic mass
• protons
• isotopes

Subatomic particles that are neutral in charge

• Neutrons
• Protons
• Nucleus 
• Electrons