28 Sep 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)