Chemistry Unit Test Review

Front

What is a gas?

Back

A gas has fast-moving particles.

Front

Which particle has a greater mass: a proton or an electron?

Back

A proton has a greater mass than an electron.

Front

How many protons does the element with atomic number 7 have?

Back

The element with atomic number 7 has 7 protons.

Front

What is an example of a mixture?

Back

Air is an example of a mixture.

Front

True or False: Density is a chemical property.

Back

False: Density is a physical property.

Front

What is the definition of a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded.

Front

What is the definition of an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is the smallest unit of an element?

Back

An atom is the smallest unit of an element.

Front

What is the definition of a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.