Chemistry

Answers to Chapters 8 & 9 Study Questions

 

1. a) 3 Na2CO3(aq) + 2 FeCl3(aq) 6 NaCl(aq) + Fe2(CO3)3(s)

b) 6 Na+(aq) + 3 CO32-(aq) + 2 Fe3+(aq) + 6 Cl-(aq) 6 Na+(aq) + 6 Cl-(aq) + Fe2(CO3)3(s)

c) 2 Fe3+(aq) + 3 CO32-(aq) Fe2(CO3)3(s)

 

2. a) Fe3+(aq) + 3 OH- (aq) Fe(OH)3(s)

b) No Reaction ((NH4)2CO3 and LiCl are both soluble)

c) Ni2+(aq) + S2-(aq) NiS(s)

 

3. a) S, OR; 2 Li(s) + Cl2(g) 2 LiCl(s)

b) DD, P; Sr(NO3)2(aq) + K2SO4(aq) 2 KNO3(aq) + SrSO4(s)

c) C, OR; 2 C3H6(g) + 9 O2(g) 6 CO2(g) + 6 H2O(l)

d) DD; CaCl2(aq) + 2 NaNO3(aq) No reaction (all products are soluble)

e) SR, OR; Fe(s) + MgSO4(aq) No reaction (Mg is more active than Fe)

f) D, OR; 2 KI(l) 2 K(s) + I2(s)

g) SR, OR; 2 Al(s) + 6 HCl(aq) 3 H2(g) + 2 AlCl3(aq)

h) DD, AB; HNO3(aq) + KOH(aq) H2O(l) + KNO3(aq)

 

4. Fe(NO3)3(s) Fe3+(aq) + 3 NO3-(aq)

 

5. a)

b)

c)

d)

 

e)

 

theoretical yield = 12.0 g CrCl3

f)

6.0 - 4.0 = 2.0 moles Cr left over.

g)

since 39.5 g < 63.2 g, 39.5 g CrCl3 is produced.