1) What is happening on a molecular level to cause a chemical reaction to occur? a) Atoms are rearranged b) Electrons are transferred c) Electrons are shared d) New elements are formed 2) What does the symbol mean in the reaction? a) Heat has been added b) Energy has been added c) Catalyst has been added d) Water has been added 3) What symbol is used when the substance is insoluble? a) aq b) l c) g d) s 4) Identify the type of reaction: 4 Fe (s) + 3 O2 (g) → 2 Fe2O3 (s) a) Synthesis b) Decomposition c) Single Replacement d) Double Replacement e) Combustion 5) Identify the type of reaction:  2 KCl(s) → 2 K(s) + Cl2(g) a) Synthesis b) Decomposition c) Single Replacement d) Double Replacement e) Combustion 6) Identify the type of reaction:  Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g) a) Synthesis b) Decomposition c) Single Replacement d) Double Replacement e) Combustion 7) Identify the type of reaction:  Na2S + HCl → NaCl + H2S a) Synthesis b) Decomposition c) Single Replacement d) Double Replacement e) Combustion 8) Identify the type of reaction:  CH4 + 2 O2 → CO2 + 2 H2O a) Synthesis b) Decomposition c) Single Replacement d) Double Replacement e) Combustion 9) What is the other reactant in a combustion reaction? a) O2 b) CO2 c) H2O 10) Which of the following is the most reactive metal? a) Lithium b) Cesium c) Gold d) Hydrogen 11) Which of the following is the least reactive metal?  a) Lithium b) Cesium c) Gold d) Hydrogen 12) Will the following reaction take place?  AuNO3 + Li -->  a) Reaction will occur b) No reaction will occur 13) Al(s) + NiSO4(aq) -->  a) Reaction will occur b) No reaction will occur 14) Zn(s) + MgBr2(aq) -->  a) Reaction will occur b) Reaction will not occur 15) In the chemical equation, H2O2(aq) --> H2O(l) + O2(g), the H2O2 is a _____. a) Reactant b) Product c) Catalyst d) Solid e) Liquid 16) Symbols used in equations, together with the explanations of the symbols, are shown below. Which set is correct? a) (g), grams b) (l), liters c) (aq), dissolved in water d) (sp), solid product e) (lq), liquid 17) What are the missing coefficients for the skeleton equation below? AlCl3 + NaOH --> Al(OH)3 + NaCl a) 1,3,1,3 b) 3,1,3,1 c) 1,1,1,3 d) 1,3,3,1 e) 3,1,1,1 18) Which of the following is insoluble? a) BaCO3 b) KOH c) CaCl2 d) AgC2H3O2 19) Which of the following is soluble? a) AgCl b) NaCl c) PbCl2 d) H2S 20) Which of the following will be a solid: BaCl2 + Na2SO4 → BaSO4 + 2 NaCl a) BaCl2 b) Na2SO4 c) BaSO4 d) NaCl

Chemical Reactions

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