1. Chemical Equations
Test Review

2. 1. List the seven diatomic molecules.

3. 2. Label the parts. Labeling of equation
Fe(s) + CuSO4(aq) → Fe2(So4)3(aq) + Cu(s)
yields
products
reactants

4. (a) What is meant by the symbol in parentheses following a chemical formula?
State of matter
(i) (s) Solid
(ii) (l) Liquid
(iii) (g) Gas
(iv) (aq) aqueous – dissolved in water

5. 3. Classify the reaction
(a) 2NaCl (aq) + Pb(NO3)2(aq) → PBCL2(s) + 2Na(NO3)(aq)
Double Replacement
(b) H2(g) + Cl2(g) → 2HCl(g)
Synthesis
(c) C2H8(g) + 4O2(g) →2CO2(g) + 4H2O(g)
Combustion
(d) 2Li(s) + 2H2O (l ) → 2LiOH(aq) + H2(g)
Single Replacement
(e) 2KNO3(s) → 2KNO2(s) + O2(g)
Decomposition

6. 4. Add coefficients to balance the equations 3 2 1
(a) ____Hf + ____N2 → ____Hf3N4 1 1 1 1
(b) ____Mg + ____H2 SO4 → ____ MgSO4 + ____H2 2 7 4 6
(c) ____C2H6 + ____ O2 → ____ CO2 + ____ H2O 1 2 1 2
(d) ____Pb(NO3)2 + ____NaI → ____PbI2 + ____NaNO3 2 2 4 1
(e) ____Pb(NO3)2 → ____PbO + ____NO2 + ____O2

7. KCl + AgNO3 → KNO3 + AgCl Write balanced chemical equations
for each word equations
(a) potassium chloride + silver nitrate → potassium nitrate+ silver chloride
KCl + AgNO3 → KNO3 + AgCl

8. Al(OH)3 + NaNO3 → Al(NO3)3 + NaOH
Write balanced
chemical equations
for each word equations
(b) aluminum hydroxide + sodium nitrate → aluminum nitrate + sodium hydroxide
Al(OH)3 + NaNO3 → Al(NO3)3 + NaOH

9. Fe + CuSO4 → FeSO4 + Cu Write balanced chemical equations
for each word equations
(c) iron metal + copper (II) sulfate → iron (II) sulfate + copper metal
Fe + CuSO4 → FeSO4 + Cu

10. Al+ CuCl2 → AlCl3 + Cu Write balanced chemical equations
for each word equations
(d) Aluminum metal + copper (II) chloride → aluminum chloride + copper metal
Al+ CuCl2 → AlCl3 + Cu

11. NaClO3 → NaCl + O2 Write balanced chemical equations
for each word equations
(e) Sodium chlorate → sodium chloride + oxygen gas
NaClO3 → NaCl + O2

12. Ca(CO3 )→ CaO + CO2 Write balanced chemical equations
for each word equations
(f) calcium carbonate → calcium oxide + carbon dioxide gas
Ca(CO3 )→ CaO + CO2

13. Zn + O2 → ZnO Write balanced chemical equations
for each word equations
(g) zinc metal + oxygen gas → zinc oxide
Zn + O2 → ZnO

14. Cl2 + Na → NaCl Write balanced chemical equations
for each word equations
(h) Chlorine gas + sodium metal → sodium chloride
Cl2 + Na → NaCl

15. Al2(SO4)3 + BaCl2 → AlCl3 + BaSO4
Write balanced
chemical equations
for each word equations
(i) aluminum sulfate + barium chloride → aluminum chloride + barium sulfate
Al2(SO4)3 + BaCl2 → AlCl3 + BaSO4

16. BeF2 + Mg → MgF2 + Be Write balanced chemical equations
for each word equations
(j) beryllium fluoride + magnesium → magnesium fluoride + beryllium
BeF2 + Mg → MgF2 + Be