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How do some chemical changes produce a gas
Answer 1:

All chemical reactions involve a change in substances and a change in energy. Neither matter or energy is created or destroyed in a chemical reaction---only changed. Some of these reactions produce a gas.

1. Here are two examples of such reactions:
Methane burns. Methane combines with oxygen in the air to make carbon dioxide and water vapor.
CH4 + 2 O2---> CO2 + 2 H2O
Glucose (simple sugar) ferments to ethyl alcohol and carbon dioxide. The sugar in grapes or from grain ferments with yeast to make the alcohol and carbon dioxide. The carbon dioxide is the gas that bubbles out of beer or champagne.
C6H12O6 (glucose)----> 2 C2H5OH (ethyl alcohol) + 2 CO2


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