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(1)C 3 H 8 combustion produces carbon dioxide and water. According to the requirements of writing equations, we can get the equation as C 3 H 8 +5O 2? Light it? . ? 3CO 2 +4H 2 O

(2) Hydrofluoric acid is a kind of salt and water produced by neutralization reaction between acid and hydrated lime. According to the meaning of the question, it can be concluded that caf _ 2 is insoluble in water after the reaction, so the equation is Ca (OH) _ 2+2hf = caf _ 2 ↓+2h2o.

So the answer is (1)C 3 H 8 +5O 2? Light it? . ? 3CO 2 +4H 2 O

(2)Ca(OH) 2 +2HF=CaF 2 ↓+2H 2 O