Atoms & Chemical Reactions Unit 2 Test (updated 2024)

Front

What is an Exothermic Reaction?

Back

A chemical reaction that releases heat.

Front

What is an Endothermic Reaction?

Back

A chemical reaction that absorbs heat.

Front

In a chemical reaction, if you have 3 atoms of Fe on the reactant side, how many atoms of Fe must be on the products side?

Back

3

Front

What type of change is breaking glass?

Back

Physical change.

Front

What happens to atoms in a chemical reaction?

Back

The atoms of the reactants unbond, rearrange, and then rebond to form the products.

Front

What does the number 1 represent for Hydrogen in the Periodic Table?

Back

Atomic number.

Front

What is the definition of an atom?

Back

The smallest unit of a chemical element that retains its properties.

Front

What is a chemical reaction?

Back

A process that involves the rearrangement of the molecular or ionic structure of a substance.

Front

What is the Law of Conservation of Mass?

Back

In a chemical reaction, mass is neither created nor destroyed.

Front

What is a reactant?

Back

A substance that takes part in and undergoes change during a reaction.