AP Chemistry : Addition and Decomposition Reactions

Study concepts, example questions & explanations for AP Chemistry

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Example Questions

Example Question #3 : Types Of Reactions

The reaction above could be classified as __________.

Possible Answers:

decomposition 

oxidation-reduction

single displacement

decomposition and oxidation-reduction

synthesis

Correct answer:

decomposition 

Explanation:

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 #1 : Addition And Decomposition Reactions

Which of the following represents a combustion reaction?

Possible Answers:

Correct answer:

Explanation:

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.

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