Unit 4 Review 24-25

Front

What type of change occurs when a substance changes its state of matter?

Back

Physical Change

Front

What is the structure of an atom?

Back

An atom has a nucleus of protons and neutrons with electrons surrounding it.

Front

What does an atomic number of 42 indicate about molybdenum?

Back

It contains 42 protons in its nucleus.

Front

Which model of a chemical reaction best represents the Law of Conservation of Mass?

Back

Model A.

Front

In which state of matter are particles MOST loosely arranged?

Back

Gas.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances.

Front

What are protons?

Back

Positively charged particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutral particles found in the nucleus of an atom.

Front

What are electrons?

Back

Negatively charged particles that orbit the nucleus of an atom.