May 31, 2013
Time to complete yesterdays work/ go over answers
Quiz Monday!!
Answers pg 241 #1­3 1. a) two compounds as reactants = double replacement
b) one element and one compound as reactants = single displacement
c) two elements as reactants = synthesis
d) one compound as a reactant = decomposition
2. a) copper + silver nitrate silver + copper (II) nitrate
single displacement
b) zinc + hydrochloric acid hydrogen + zinc chloride
single displacement
c) calcium carbonate + hydrochloric acid carbonic acid + calcium chloride
double replacement
d) aluminum + copper (II) chloride copper + aluminum chloride single replacement
3. a) copper + silver nitrate ⇒ silver + copper (II) nitrate Cu + Ag1+ NO3 1­ ⇒
Cu 2+ (NO3)1­ + Ag
Cu + AgNO3 ⇒
Cu(NO3)2 + Ag (skeletal eqn)
Cu + 2AgNO3 ⇒ Cu(NO3)2 + 2Ag (balanced eqn)
b) zinc + hydrochloric acid ⇒ hydrogen + zinc chloride
2+ 1­
Zn + HCl
⇒ H2 + Zn Cl Zn + HCl ⇒ H2 + ZnCl2 (skeletal eqn)
Zn + 2HCl
⇒ H2 + ZnCl2 (balanced eqn)
c) calcium carbonate + hydrochloric acid ⇒ carbonic acid + calcium chloride
Ca2+CO32­ + HCl ⇒ Ca2+Cl1­ + H2CO3
CaCO3 + HCl ⇒ CaCl2 + H2CO3 (skeletal eqn)
CaCO3 + 2 HCl ⇒ CaCl2 + H2CO3 (balanced)
d) aluminum + copper (II) chloride ⇒copper + aluminum chloride Al + Cu2+ Cl1­ ⇒ Cu + Al3+ Cl1Al + CuCl2 ⇒ Cu + AlCl3 (skeletal eqn)
2Al + 3CuCl2 2AlCl3 + 3Cu (balanced eqn)
Answers pg 247 #1­5
1. In both synthesis and single displacement reactions, at least one reactant is an element and one new compound is produced. 2. In both decompositions and double displacement reactions, the reactant compounds are broken down. 3. Synthesis and decomposition reactions appear opposite. In synthesis a compound is formed and in decomposition a compound is broken down. 4. a) synthesis
b) single replacement
c) double replacement
d) decomposition
e) decomposition
f) single replacement
g) synthesis
5. a) barium + sulfur ⇒barium sulfide
2+
Ba2+S
Ba + S8 ⇒
Ba + S8 ⇒ BaS (skeletal) 8BaS (balanced) 8Ba + S8 ⇒
b) bromine + sodium iodide ⇒ iodine + sodium bromide
1­
1+
1­
Na1+I ⇒ I2 + Na Br
Br2 + Br2 + NaI ⇒ I2 + NaBr (skeletal) Br2 + 2NaI ⇒ I2 + 2NaBr (balanced)
c) barium nitrate + sodium sulfide ⇒ barium sulfide + sodium nitrate
1­ + Na1+S2­ ⇒
Ba2+ NO3
+ Na1+NO31Ba2+S2Ba(NO3)2 + Na2S ⇒BaS + NaNO3 (skeletal) Ba(NO3)2 + Na2S ⇒BaS + 2NaNO3 (balanced) d) lithium carbonate ⇒ carbon dioxide + lithium oxide
1­ Li1+CO3
+ Li1+O2⇒
CO2
Li2CO3 ⇒ CO2 + Li2O (skeletal and balanced) e) lead (II) oxide ⇒ lead + oxygen
Pb2+O2­ ⇒ Pb + O2
PbO ⇒Pb + O2 (skeletal) 2PbO ⇒2Pb + O2 (balanced) f)calcium + water ⇒ hydrogen + calcium hydroxide
Ca + H2O ⇒
+ Ca2+OH1H2
Ca + H2O ⇒ H2 + Ca(OH)2 (skeletal) Ca + 2H2O ⇒ H2 + Ca(OH)2 (balanced) g) sulfur trioxide + water ⇒ sulfuric acid
SO3 + H2O ⇒ H2SO4 (skeletal and balanced) 1)
2 NaBr + 1 Ca(OH)2 à 1 CaBr2 + 2 NaOH
Type of reaction: double displacement
2)
2 NH3+ 1 H2SO4 à 1 (NH4)2SO4 Type of reaction: synthesis
3)
4 C5H9O + 27 O2 à 20 CO2 + 18 H2O
Type of reaction: combustion
4)
3 Pb + 2 H3PO4 à 3 H2 + 1 Pb3(PO4)2
Type of reaction: single replacement
5)
1 Li3N + 3 NH4NO3 à 3 LiNO3 + 1 (NH4)3N
Type of reaction: double replacement
6) 2 KClO3 → 2 KCl + 3 O2
Type of reaction : decomposition
7) 2 KBr + F2 → 2 KF + Br2 Type of reaction: single replacement
8) Na3PO4 + 3 KOH à 3 NaOH + K3PO4 Type of reaction: double replacement
9) MgCl2 + Li2CO3 à MgCO3 + 2 LiCl Type of reaction: double replacement
10) CaCO3 à CaO + CO2 11) 2 C5H5 + Fe à Fe(C5H5)2 Type of reaction: decomposition
Type of reaction: synthesis
12) SeCl6 + O2 à SeO2 + 3Cl2 Type of reaction: single replacement
13) C3H6O + 4 O2 à 3 CO2 + 3 H2O Type of reaction: combustion
14) 2 NO2 à 2 O2 + N2 Type of reaction : decomposition
15) 1 AlCl3 + 3 Cs à 3 CsCl + 1 Al
Type of reaction: Single Displacement