Chemical Reactions and the Conservation of Mass

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A(n) __ occurs when oxygen combines with another substance.

A(n) __ uses chemical symbols and formulas to describe a chemical reaction.

Which of the following equations does NOT demonstrate the law of conservation of mass?

In a chemical reaction, the mass of the products always __ the mass of the reactants.

What does the law of conservation of mass state?

The following word equation describes a chemical reaction in which hydrogen is produced. magnesium + hydrochloric acid - magnesium chloride + hydrogen What is the source of the atoms in the hydrogen gas produced by this reaction?

A(n) __ is a substance that reacts with another substance in a chemical reaction.

The __ states that matter cannot be created or destroyed during a physical or chemical change.