All AP Chemistry Resources
Example Question #1 : Addition And Decomposition Reactions
The reaction above could be classified as __________.
decomposition and oxidation-reduction
When one molecule is converted into two or more smaller molecules, the reaction is considered a decomposition reaction. In this example, none of the elements under go a change in oxidation number, so this is not an oxidation-reduction reaction. (Calcium is always , oxygen is always , and carbon remains throughout the reaction.)
Example Question #2 : Addition And Decomposition Reactions
Which of the following represents a combustion reaction?
Combustion reactions always produce and excess heat. Depending on the molecule that is oxidized by oxygen, which in this case was methane , the ratios between and can vary.