Unit 1 Re-Test

Front

What does it mean that the universe is expanding?

Back

The amount of space between galaxies is increasing.

Front

What are carbon-14 and carbon-12 examples of?

Back

Isotopes.

Front

How is the mass number of a nucleus defined?

Back

The number of protons plus the number of neutrons.

Front

What two parts make up the nucleus of an atom?

Back

Protons and Neutrons.

Front

What is a substance made up of two or more elements that are chemically combined?

Back

Compound.

Front

What is the definition of an atom?

Back

The smallest unit of an element that retains the properties of that element.

Front

What is the difference between a mixture and a compound?

Back

A mixture is a combination of substances that are not chemically bonded, while a compound is formed when two or more elements are chemically combined.

Front

What are the three subatomic particles of an atom?

Back

Protons, Neutrons, and Electrons.

Front

What charge do protons carry?

Back

Positive charge.

Front

What charge do electrons carry?

Back

Negative charge.