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Unit 4 Reactions
Write balanced equations from the following word equations:
1. Pure copper can be produced by heating copper (II) sulfide with oxygen. Sulfur dioxide is
also produced by this reaction.
CuS + O2(g) → Cu(s) + SO2
2. Solid sulfur burns in oxygen gas to form sulfur dioxide.
S(s) + O2(g) → SO2
3. A compound manganese (IV) oxide catalyzes the decomposition of an aqueous solution of
hydrogen peroxide (H2O2) to produce water and oxygen.
2 H2O2(aq) → 2 H2O(l) + O2(g)
4. Oxygen gas can be made by heating potassium chlorate in the presence of the catalyst
manganese (IV) oxide. Potassium chloride is left as a solid residue.
2 KClO3 → 2 KCl(s) + 3 O2(g)
5. When solid mercury (II) sulfide is heated with oxygen, liquid mercury metal and gaseous
sulfur dioxide are produced.
HgS(s) + O2(g) → Hg(l) + SO2(g)
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