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
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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