HChem Unit 6 Test Review

In _____ reactions, there are two or more reactants and only one product.

• synthesis

• decomposition

• single-replacement

• double-replacement

• combustion

In _____ reactions, there is only one reactants and two or more products

• synthesis

• decomposition

• single-replacement

• double-replacement

• combustion

In _____ reactions, there is an element and a compound as the reactants, and an element and a compound as the products.

• synthesis

• decomposition

• single-replacement

• double-replacement

• combustion

In _____ reactions, there are two compounds as reactants and two compounds as products.

• synthesis

• decomposition

• single-replacement

• double-replacement

• combustion

In _____ reactions, there is oxygen gas as a reactant.

• synthesis

• decomposition

• single-replacement

• double-replacement

• combustion

When a reaction is _____, energy is released as a reactant of the reaction.

• endothermic

• exothermic

• synthesis

• decomposition

When a reaction is _____, energy is released as a product of the reaction.

• endothermic

• exothermic

• synthesis

• decomposition

_____ is stored in chemical bonds.

• Thermal energy

• Nuclear energy

• Chemical energy

_____ are used to show the number of molecules in an equation and appear in front of the formula in a chemical equation.

• Exponents

• Superscripts

• Subscripts

• Coefficients

When a reaction is _____, the temperature of the reaction decreases so the container feels cold.

• endothermic

• exothermic

• synthesis

• decomposition