Below are several statements. Which of these statements apply to chemical reactions?

I. A chemical reaction always involves two reactants.
II. Physical changes are a type of chemical reaction.
III. Energy changes are involved in chemical reactions.
IV. Atoms are gained and lost during a chemical reaction.
V. Bonds are broken and new bonds formed during a chemical reaction.

Question

Below are several statements. Which of these statements apply to chemical reactions?

I. A chemical reaction always involves two reactants.
II. Physical changes are a type of chemical reaction.
III. Energy changes are involved in chemical reactions.
IV. Atoms are gained and lost during a chemical reaction.
V. Bonds are broken and new bonds formed during a chemical reaction.

Quizplus · Accepted Answer

Statement I is not true because chemical reactions can involve any number of reactants.
Statement II is false because physical changes are not the same as chemical reactions.
Statement III is true. Energy changes during a chemical reaction are caused by the breaking and forming of chemical bonds.
Statement IV is not true because atoms cannot be gained or lost during a chemical reaction, only rearranged.
Statement V is true. Breaking and forming of bonds is a fundamental part of a chemical reaction.

Below Are Several Statements