The following chemical equation shows the reaction in which
natural gas (methane or CH4) is burned.
Refer to this equation while answering the following questions.
![](pics/ch4.gif)
20. Refer to the equation above. Which of the molecules in
this reaction poses environmental danger when it is produced in too large a
quantity?
a) CH4
b) O2
c) CO2
d) H2O
The best answer is c.
CO2 (carbon dioxide) is a greenhouse
gas, meaning it causes the atmosphere to trap heat when the amount of carbondioxide
becomes too numerous in the atmosphere.
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