Calcium carbonate, when heated, form calcium oxide and carbon dioxide gas.
Answer: CaCO3(s) → CaO(s) + CO2(g)
Sulfuric acid, when heated, decomposes to water and sulfur trioxide.
Answer: H2SO4 → H2O(l) + SO3(g)
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
Answer: sodium combined with water yields sodium hydroxide and hydrogen gas.
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