Types of chemical reaction

Combination reactions always:

• Involve an element and an ionic compound

• Forms only one product

• Requires oxygen gas

• Use only one reactant

The chemical equation, KClO3 → KCl + O2, is an example of which type of reaction?

• Single displacement

• Double displacement

• Decomposition

• Direct combination

Of the balanced chemical equations below, which one most correctly represents a combustion reaction?

• 2 Mg + O2 → 2 MgO

• 2 CH4 + 4 O2 → 2 CO2 + 4 H2O

• CaO + H2O → Ca(OH)2

• 2 N2 + 3 H2 → 2 NH3

Of the reactions below, which one is a double-replacement reaction?

• Cd(NO3)2 + Na2S → CdS + 2 NaNO3

• 2 Mg + O2 → 2 MgO

• NH4Cl → NH3 + HCl

• 2 N2 + 3 H2 → 2 NH3

In the following chemical reaction, what product is represented by X?

AlCl3 + NaOH → X + NaCl

• Al(OH)2

• AlOH

• Al(OH)3

• AlCl2

In a decomposition reaction:

• The reactants are generally two ionic compounds in aqueous solution

• The reactants are usually a metal and a nonmetal

• Energy in the form of heat or light is often produced

• One of the reactants is often water