SDSU Chemistry Placement Practice Test 2025 - Free Chemistry Placement Practice Questions and Study Guide

Photosynthesis is a specific biochemical process used by plants and some other organisms to convert light energy into chemical energy, resulting in the production of glucose and oxygen from carbon dioxide and water. While photosynthesis involves a series of reactions and can be broken down into smaller chemical processes, it is not classified as a general type of chemical reaction in the same way that combination, decomposition, and double substitution reactions are.

Combination reactions involve two or more substances combining to form a new compound. Decomposition reactions occur when a single compound breaks down into two or more simpler substances. Double substitution reactions involve the exchange of components between two compounds to form two new compounds. These categories are standard classifications in chemistry. Photosynthesis, being a specific process, does not fit into these generalized categories of chemical reactions outlined in the text.