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Si+O2=SiO2 - оксид кремния
2K+O2=K2O2 - пероксид калия
2C2H2+5O2=4CO2+2H2O - углекислый газ и вода
2. При тушении водой
1) прекращается доступ кислорода - необходимого условия для горения
2)остывание реагентов - невозможность дальнейшего продолжения реакции
3. воздух - смесь газов, не состоит из отдельных "молекул воздуха", их не существует