1) Of the reactions below, which one is a double-replacement reaction? a) Cd(NO3)2 + Na2S → CdS + 2 NaNO3 b) 2 Mg + O2 → 2 MgO c) NH4Cl → NH3 + HCl d) 2 N2 + 3 H2 → 2 NH3 2) Which chemical equation correctly represents the decomposition reaction that takes place when ammonia breaks down to form hydrogen gas and nitrogen gas? a) NH3 → N2 + H2 b) NH3 + H2 → N2 c) N2 + H2 → NH3 d) NH3 → N + H 3) In the following chemical reaction, what product is represented by X ? AlCl3 + NaOH → X + NaCl a) Al3OH b) It cannot be determined c) AlOH d) Al(OH)3 4) 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) a) 4 only b) 2 and 3 c) All are decomposition reactions d) 2, 3, and 4 5) The chemical equation, KClO3 → KCl + O2, is an example of which type of reaction? a) double-displacement b) single-displacement c) combustion d) decomposition 6) Of the balanced chemical equations below, which one most correctly represents a combustion reaction? a) CaO + H2O → Ca(OH)2 b) 2 CH4 + 4 O2 → 2 CO2 + 4 H2O c) 2 Mg + O2 → 2 MgO d) 2 N2 + 3 H2 → 2 NH3 7) In a decomposition reaction: a) the reactants are usually a metal and a nonmetal b) the reactants are generally two ionic compounds in aqueous solution c) one of the reactants is often water d) energy in the form of heat or light is often produced 8) Combination reactions always a) form only one product b) require oxygen gas c) use only one reactant d) involve an element and an ionic compound 9) The chemical equation, Cr + Fe(NO3)2 → Fe + Cr(NO3)3, is an example of which type of reaction? a) single-displacement b) combustion c) decomposition d) double-displacement 10) When propane is reacted in the presence of oxygen gas, the products of this combustion reaction are: a) CO2 + H2 b) C + H2 c) CH2 + H2O d) CO2 + H2O





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