Science 10 Chemistry Quiz 2
Balancing Chemical Equations/Word Equations
Part A: Balancing Chemical Equations
1. Balance the following chemical equations
2. Classify as:
◦ Single Replacement (SR),
◦ Double Replacement (DR),
◦ Acid-Base (AB),
◦ Synthesis (S).
◦ Combustion (C)
Name: _____________________ ___/48
(3 marks each / 33 marks)
The first one is done for you as an example.
1) _2_ NaNO3 + ___ PbO à ___ Pb(NO3)2 + ___ Na2O DR
2) _6_ KI + ___ Fe2(CO3)3 à _2_ FeI3 + _3_ K2CO3
DR
3) ___ C2H4O2 + _2_ O2 à _2_ CO2 + _2_ H2O combustion
4) ___ ZnSO4 + ___ Li2CO3 à ___ ZnCO3 + ___ Li2SO4
DR
5) _____ C4H8O2 + __5__ O2 → ___4_ H2O + __4__ CO2 Combustion
6) ___ Mg(NO3)2 + ___ CaCl2 à ___ Ca(NO3)2 + ___ MgCl2
DR
7) _3_ NaBr + ___ AlPO4 à ___ Na3PO4 + ___ AlBr3 DR
8) _3_ H2SO4 + __2 Al(OH)3 à __ Al2(SO4)3 + __6 HOH Acid Base
9) ___ S8 + _8_ O2 à _8_ SO2
synthesis
10) ___ Fe + _2_ NaNO3 à ___ Fe(NO3)2 + _2_ Na
SR
11) _2_N2 + ___5_ O2 → __2__ N2O5 synthesis
12) _____ Zn + ___2_ KNO3 → _____ Zn(NO3)2 + __2__ K
Cation
Anion
Carbonate CO3
Chloride Cl1-
Nitrate NO31-
Bromide Br1-
Potassium K1+
Sulphate SO42-
Iodide I1-
Lead (II) Pb2+
Phosphate PO43-
Zinc Zn2+
Hydroxide OH1-
Lithium Li
1+
SR
Sodium Na1+
Iron (III) Fe
3+
Aluminum Al3+
2-
Oxide O2-
Part B: Write the word equations for these chemical equations. (7 marks)
The first one is done for you as an example
1. MgBr2 + 2 KOH → 2 KBr + Mg(OH)2
magnesium bromide + potassium hydroxide → potassium bromide + magnesium hydroxide
2. FeCl2 + Na2SO4 → 2 NaCl + FeSO4
iron (II) chloride + sodium sulphate becomes sodium chloride + iron (II) sulphate
3. NO + NO2 → N2O3
nitrogen monoxide + nitrogen dioxide becomes dinitrogen trioxide
Part C: Balancing Word Equations (8 marks)
1. When zinc metal is added to copper(I) sulphate solution, copper metal and colourless zinc
sulphate solution is produced.
Word Equation (1 mark)
zinc + copper(I) sulphate becomes copper + zinc sulphate
Skeleton equation: (1 mark)
1+ 2-
2+ 2-
Zn + CuSO4 → Cu + ZnSO4
Correct Chemical equation (apply criss cross rule or HIBrONClIF) (1 mark)
Zn + Cu2SO4 → Cu + ZnSO4
Balanced Chemical equation: (1 mark)
Zn + Cu2SO4 → 2 Cu + ZnSO4
2. Tricarbon octahydride reacts with oxygen to produce carbon dioxide and water.
Word Equation (1 mark)
tricarbon octahydride + oxygen becomes carbon dioxide and water
Skeleton equation: (1 mark)
C3H8 + O → CO2 + H2O
Correct Chemical equation (apply criss cross rule or HIBrONClIF) (1 mark)
C3H8 + O2 → CO2 + H2O
Balanced Chemical equation: (1 mark)
C3H8 + 5 O2 → 3CO2 + 4H2O