Atoms & Chemical Reactions Unit 2 Test (updated 2024)

Front

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

Back

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

Front

Which of the following is NOT evidence of a chemical change?

Back

Solid turns into a liquid.

Front

What is an exothermic reaction?

Back

A reaction that releases heat.

Front

How many protons does Hydrogen have in its nucleus?

Back

1 proton.

Front

What is an endothermic reaction?

Back

A reaction that absorbs heat.

Front

What is a chemical reaction?

Back

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

Front

What is the law of conservation of mass?

Back

Mass cannot be created or destroyed in a chemical reaction.

Front

What are reactants in a chemical reaction?

Back

The starting substances that undergo change.

Front

What are products in a chemical reaction?

Back

The substances formed as a result of a chemical reaction.

Front

What is a physical change?

Back

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