Chemistry II Review #3 (Chemical Reactions)

Front

What is a chemical reaction?

Back

A chemical change; a process that changes substances into new substances.

Front

What type of reaction is represented by the equation 2 C2H6 + 7 O2 → 4 CO2 + 6 H2O?

Back

Combustion.

Front

What is a coefficient in a chemical equation?

Back

The number before the chemical formula; it represents the number of molecules that are present (e.g., in 2H2O2, 2 is the coefficient).

Front

What is a decomposition reaction?

Back

A type of chemical reaction where one compound breaks down into two or more simpler products.

Front

What is a double replacement reaction?

Back

A type of chemical reaction where two compounds exchange ions or bonds to form two new compounds.

Front

What is a synthesis (combination) reaction?

Back

A type of chemical reaction where two or more reactants combine to form a single product.

Front

What is a reactant?

Back

A substance that takes part in and undergoes change during a reaction.

Front

What is a product in a chemical reaction?

Back

The substances that are formed as a result of a chemical reaction.

Front

What does the term 'subscript' refer to in a chemical formula?

Back

A number written below and to the right of a chemical symbol indicating the number of atoms of that element in a molecule.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.