Science 9 Unit B Background Check

The basic unit of all matter is the

• atom

• cell

• electron

• matterite

Which of the following are parts of an atom?

• electron

• neutron

• proton

• organelle

Electrons have a ___ charge and protons have a ___ charge.

• negative, neutral

• negative, positive

• positive, neutral

• positive, negative

When matter is made only one thing it is called a

• chemical

• mixture

• pure substance

• solution

An example of a pure substance is

• milk

• paint

• water

• wood

A substance with clearly different substances making it is called a

• Compound

• Mechanical mixture

• Pure substance

• Solution

When a substance is dissolved into another substance, this is called a

• Colloid

• Mechanical mixture

• Solution

• Suspension

In salt water, the salt is the ___ and the water is the ___.

• Solute, solvent

• Solvent, solute

• Solute, solution

• Solution, solvent

When a solid becomes a liquid, this is called

• condensation

• evaporation

• freezing

• melting

Processes like melting, freezing, condensation, and evaporation are

• chemical changes

• chemical reactions

• physical changes

• physical reactions