01 Oct Choose the correct evidence of a chemical reaction for each of the following observations:
CHEM1305 Introductory Chemistry
Chapter 7 Homework Assignment
Question 1Choose the correct evidence of a chemical reaction for each of the following observations:
a) adding a piece of zinc metal to acid causes bubbles to form
a gas is produced
b) mixing two colorless solutions gives a pink solution
a gas is produced
c) adding potassium metal to water causes flames
an energy change is observed
d) adding sodium chloride to a silver nitrate solution causes a white powder to form in the solution
an insoluble solid is produced in a solution
Question 2Choose the most correct chemical equation (with all the appropriate symbols) for the following reaction:
nitric acid reacts with aqueous ammonium hydroxide to give aqueous ammonium nitrate plus water
HNO3 + NH4OH → NH4NO3 + H2O
HNO3 + NH4OH + NH4NO3 + H2O
HNO3(aq) + NH4OH(aq) → NH4NO3(aq) + H2O(l)
HNO3(s) + NH4OH(l) → NH4NO3(aq) + H2O(g)
Question 3Balance the following chemical reactions (choose “1” if no coefficient is needed):
a) 1 Al2(CO3)3(s) → 1 Al2O3(s) + 3 CO2(g)
b) 1 Hg2(NO3)2(aq) + 2 NaBr(aq) → 1 Hg2Br2(s) + 2 NaNO3(aq)
c) 2 (NH4)3PO4(aq) + 3 Pb(NO3)2(aq) → 1 Pb3(PO4)2(s) + 6 NH4NO3(aq)
Question 4Classify each of the following chemical reactions:
a) 3 Sn(s) + 2 P(s) → Sn3P2(s)
combination
b) 2 HClO4(aq) + Ba(OH)2(s) → Ba(ClO4)2(s) + 2 H2O(l)
neutralization
c) Cu(s) + 2 AgC2H3O2(aq) → Cu(C2H3O2)2(aq) + 2 Ag(s)
single-replacement
d) 2 LiClO3(s) → 2 LiCl(s) + 3 O2(g)
decomposition
e) Pb(NO3)2(aq) + 2 LiCl(aq) → PbCl2(s) + 2 LiNO3(aq)
double-replacement
Question 5Choose the correct, balanced chemical equation for the following combination reaction:
aluminum metal is heated with sulfur powder to form solid aluminum sulfide
Al(s) + S(s) heatrxn AlS(s)
Al(s) + S(s) heatrxn Al2S3(s)
2 Al(s) + 3 S(s) heatrxn Al2S3(s)
Question 6Choose the correct, balanced chemical equation for the following decomposition reaction:
solid lithium carbonate decomposes with heat to form solid lithium oxide and carbon dioxide gas
Li2CO3(s) heatrxn Li2O(s) + CO2(g)
LiCO3(s) heatrxn 2 LiO(s) + CO2(g)
LiCO2(s) heatrxn Li(s) + CO2(g)
Question 7Using the activity series, predict whether a reaction occurs or no reaction occurs for each of the following single-replacement reactions:
a) Cu(NO3)2(aq) + Ni(s) →Reaction Occurs
b) Au(s) + H2SO4(aq) →No Reaction
c) FeSO4(aq) + Ag(s) →Reaction Occurs
Question 8Using the solubility table, determine whether each of the following compounds are soluble or insoluble in water:
a) calcium sulfide, CaSsoluble
b) lead(II) sulfate, PbSO4insoluble
c) barium chromate, BaCrO4insoluble
Question 9Using the solubility table, predict whether a reaction occurs or no reaction occurs for each of the following double-replacement reactions:
a) AgC2H3O2(aq) + SrI2(aq) →No Reaction
b) FeSO4(aq) + CuCl2(aq) →No Reaction
c) NaOH(aq) + Co(NO3)2(aq) →No Reaction
Question 10Choose the correct, balanced chemical equation for the following neutralization reaction:
nitric acid reacts with aqueous barium hydroxide to form aqueous barium nitrate and water
HNO3 + BaOH → BaNO3 + H2O
2 HNO3(aq) + Ba(OH)2(aq) → Ba(NO3)2(aq) + 2 H2O(l)
HNO3(aq) + Ba(OH)2(aq) → Ba(NO3)2(aq) + H2O(l)
