Chemistry Regents Practice Test 2026 – The All-in-One Guide to Exam Success!

A synthesis reaction is characterized by the combination of two or more reactants to form a new, more complex product. This process can involve elements or simpler compounds joining together. The key feature of a synthesis reaction is that it results in the formation of a single product from multiple reactants.

In contrast, the other options describe different types of chemical reactions:

- The breakdown of a single compound into simpler substances indicates a decomposition reaction.

- The replacement of one element in a compound with another describes a single replacement reaction.

- The exchange of components between two compounds is representative of a double replacement reaction.

Each of these reactions has distinct characteristics and mechanisms, but a synthesis reaction specifically focuses on the combination of reactants to form a new product, making the choice highlighting that process the correct one.