Unit 3 Chemical and Physical Change Practice

Front

What is the difference between compounds and atoms?

Back

Compounds are made of atoms.

Front

What is an exothermic reaction?

Back

A reaction that releases energy.

Front

What type of reaction is combustion?

Back

Exothermic.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; the total mass of reactants equals the total mass of products.

Front

What is an endothermic reaction?

Back

A reaction that absorbs energy.

Front

What is a chemical equation?

Back

A representation of a chemical reaction using symbols and formulas.

Front

How do you balance a chemical equation?

Back

By ensuring the number of atoms for each element is the same on both sides of the equation.

Front

What is the product of the reaction between methane (CH₄) and oxygen (O₂)?

Back

Carbon dioxide (CO₂) and water (H₂O).

Front

What is a reactant?

Back

A substance that undergoes change in a chemical reaction.

Front

What is a product?

Back

A substance that is formed as a result of a chemical reaction.