Atoms & Chemical Reactions Unit 2 Test (updated 2024)

Front

What type of change occurs when baking a cake?

Back

Chemical change.

Front

What keeps a hydrogen atom's proton and electron near each other?

Back

Positive and negative charges attract.

Front

What is a precipitate?

Back

A solid formed when two liquids react.

Front

What does it mean when we say mass is conserved in a chemical reaction?

Back

The type and number of atoms in the reactants equals the type and number of atoms in the products.

Front

What is a covalent bond?

Back

A bond formed when atoms share electrons.

Front

What is the smallest unit of an element?

Back

Atom.

Front

What are the three main subatomic particles?

Back

Protons, neutrons, and electrons.

Front

What charge does a proton have?

Back

Positive charge.

Front

What charge does an electron have?

Back

Negative charge.

Front

What is a chemical reaction?

Back

A process where substances (reactants) transform into new substances (products).