Reactions Test Review

Front

What is a balanced chemical reaction?

Back

A chemical reaction is balanced when both sides have the same number of atoms.

Front

Which substance is more acidic than lemon juice?

Back

Hydrochloric acid is more acidic than lemon juice.

Front

What is fission in nuclear chemistry?

Back

Fission is the splitting of an atom into two or more parts that releases a lot of energy.

Front

What is the half-life of iodine-131?

Back

The half-life of iodine-131 is 8 days.

Front

What is the half-life of an isotope that decays in 10 seconds?

Back

The half-life of this isotope is 10 seconds.

Front

Define pH.

Back

pH is a scale used to measure the acidity or basicity of a solution.

Front

What does a pH less than 7 indicate?

Back

A pH less than 7 indicates an acidic solution.

Front

What does a pH greater than 7 indicate?

Back

A pH greater than 7 indicates a basic (alkaline) solution.

Front

What is the significance of coefficients in a chemical equation?

Back

Coefficients indicate the number of molecules or moles of each substance involved in the reaction.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.