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Balancing Chemical Equations – Advanced – Answers
a) magnesium + steam  magnesium oxide + hydrogen
Mg(s) + H2O(g)  MgO(s) + H2(g)
b) sodium + water  sodium hydroxide + hydrogen
2Na(s) + 2H2O(l)  2NaOH(aq) + H2(g)
c) calcium + water  calcium hydroxide + hydrogen
Ca(s) + 2H2O(l)  Ca(OH)2(aq) + H2(g)
d) hydrogen + oxygen  water
2H2(g) + O2(g)  2H2O(l)
e) aluminium + oxygen  aluminium oxide
4Al(s) + 3O2(g)  2Al2O3(s)
f) aluminium + iodine  aluminium iodide
2Al(s) + 3I2(s)  2AlI3(s)
g) hydrogen + nitrogen  ammonia
3H2(g) + N2(g)  2NH3(g)
h) hydrogen + chlorine  hydrogen chloride
H2(g) + Cl2(g)  2HCl(g)
i) potassium + chlorine  potassium chloride
2K(s) + Cl2(g)  2KCl(s)
j) hydrochloric acid + zinc  zinc chloride + hydrogen
2HCl(aq) + Zn(s)  ZnCl2(aq) + H2(g)
k) sulfuric acid + magnesium  magnesium sulfate + hydrogen
H2SO4(aq) + Mg(s)  MgSO4(s) + H2(g)
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l) hydrochloric acid + calcium carbonate  calcium chloride + carbon dioxide + water
2HCl(aq) + CaCO3(s)  CaCl2(aq) + CO2(g) + H2O(l)
m) sulfuric acid + iron  iron(II) sulfate + hydrogen
H2SO4(aq) + Fe(s)  FeSO4(aq) + H2(g)
n) sulfuric acid + sodium carbonate  sodium sulfate + carbon dioxide + water
H2SO4(aq) + Na2CO3(s)  Na2SO4(aq) + CO2(g) + H2O(l)
o) copper(II) carbonate  copper(II) oxide + carbon dioxide
CuCO3(s)  CuO(s) + CO2(g)
p) zinc carbonate  zinc oxide + carbon dioxide
ZnCO3(s)  ZnO(s) + CO2(g)
q) potassium nitrate  potassium nitrite + oxygen
2KNO3(s)  2KNO2(s) + O2(g)
r) lead(II) nitrate  lead(II) oxide + nitrogen dioxide + oxygen
2Pb(NO3)2(s)  2PbO(s) + 4NO2(g) + O2(g)
s) ammonium chloride  hydrogen chloride + ammonia
NH4Cl(s)  HCl(g) + NH3(g)
t) hydrogen iodide  hydrogen + iodine
2HI(g)  H2(g) + I2(s)
u) calcium nitrate + sodium hydroxide  calcium hydroxide + sodium nitrate
Ca(NO3)2(aq) + 2NaOH(aq)  Ca(OH)2(aq) + 2NaNO3(aq)
v) sulfuric acid + sodium hydroxide  sodium sulfate + water
H2SO4(aq) + 2NaOH(aq)  Na2SO4(aq) + 2H2O(l)
w) aluminium + iron(III) oxide  iron + aluminium oxide
2Al(s) + Fe2O3(s)  2Fe(s) + Al2O3(s)
x) copper(II) oxide + hydrogen  copper + water
CuO(s) + H2(g)  Cu(s) + H2O(l)
y) iron(III) oxide + carbon monoxide  iron + carbon dioxide
Fe2O3(s) + 3CO(g)  2Fe(s) + 3CO2(g)
z) manganese(IV) oxide + hydrochloric acid  manganese(II) chloride + chlorine +
water
MnO2(s) + 4HCl(aq)  MnCl2(aq) + Cl2(g) + 2H2O(g)
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