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
CH4 + 2 O2---> CO2 + 2
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.
(glucose)----> 2 C2H5OH (ethyl alcohol) + 2 CO2
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