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Answer variants:
Element + Element → Compound
Element + Compound → Compound
Compound + Compound → Compound
1. H_2+Cl_2→2HCl:
2. SiO_{2(s)}+CaO_{(s)}→CaSiO_{3(s)}:
3. CH_4+2O_2→CO_2+2H_2O:
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