Review for Unit Test Chemistry 2

Front

Which subatomic particle has the smallest mass?

Back

Electron

Front

What is a way in which elements and compounds are similar?

Back

Elements and compounds are pure substances.

Front

A ___________ is a combination of many different elements not chemically combined.

Back

Mixture

Front

What is the correct formula for two hydrogen (H), one sulfur (S), and four oxygen (O)?

Back

H₂SO₄

Front

All matter is made of .....

Back

Atoms.

Front

What is an atom?

Back

The basic unit of a chemical element.

Front

What is a compound?

Back

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

Front

What is the periodic table?

Back

A table that organizes all known elements by their atomic number, electron configuration, and recurring chemical properties.

Front

What is a chemical reaction?

Back

A process that leads to the transformation of one set of chemical substances to another.

Front

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

Back

A physical change affects one or more physical properties of a substance, while a chemical change results in the formation of new chemical substances.