Reaction types

Synthesis reactions always...

• involve an element and an ionic compound

• form only one product

• require oxygen gas

• use only one reactant

Which chemical equation correctly represents the decomposition reaction that takes place when ammonia breaks down to form hydrogen gas and nitrogen gas?

• N2 + H2 → NH3

• NH3 → N + H

• NH3 + H2 → N2

• NH3 → N2 + H2

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

• 2 Mg + O2 → 2 MgO

• 2 N2 + 3 H2 → 2 NH3

• 2 CH4 + 4 O2 → 2 CO2 + 4 H2O

• CaO + H2O → Ca(OH)2

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

• single-replacement

• decomposition

• combustion

• double-replacement

When propane is reacted in the presence of oxygen gas, the products of this combustion reaction are:

• CH2 + H2O

• C + H2

• CO2 + H2

• CO2 + H2O

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

AlCl3 + NaOH → X + NaCl

• AlOH

• Al(OH)₃

• No solution.

• Al₃OH

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

• 2 Mg + O2 → 2 MgO

• 2 N2 + 3 H2 → 2 NH3

• NH4Cl → NH3 + HCl

• Cd(NO3)2 + Na2S → CdS + 2 NaNO3

Which of the following are decomposition reactions?

1.)CH4 (g) + O2 (g) → CO2 (g) + H2O (l)

2.) CaO (s) + CO2 (g) → CaCO3 (s)

3.)Mg (s) + O2 (g) → MgO (s)

4.) PbCO3 (s) → PbO (s) + CO2 (g)

• 2, 3, and 4

• 1,2,3 and 4

• 2 and 3

• Only 4

The chemical equation, Cr + Fe(NO3)2 → Fe + Cr(NO3)3, is an example of which type of reaction?

• double-replacement

• decomposition

• single-replacement

• combustion

In a decomposition reaction:

• one of the reactants is often water

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

• the reactants are usually a metal and a nonmetal

• the reactants are generally two ionic compounds in aqueous solution