Unit 3 Practice Test

Front

What is an ion with a negative charge called?

Back

An anion is formed when an atom gains electrons.

Front

What is a benefit of nuclear energy production?

Back

Nuclear energy is a reliable source of electricity and can provide consistent power for communities.

Front

What type of nuclear reaction combines small nuclei to form a large nucleus?

Back

Nuclear fusion.

Front

If a radioactive potassium isotope has a half-life of one week, how much of the original sample remains after three weeks?

Back

1/8 of the original sample remains.

Front

How are protons and neutrons similar?

Back

Both are in the nucleus of the atom and they both have a relative mass of 1.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

Front

What is the process of splitting a large nucleus into smaller nuclei called?

Back

Nuclear fission.

Front

What is the main source of energy in stars?

Back

Nuclear fusion is the main source of energy in stars.

Front

What is the term for the time it takes for half of a radioactive substance to decay?

Back

Half-life.