Michigan Test for Teacher Certification (MTTC) Secondary Integrated Science Practice Test 2025 - Free Practice Questions and Study Guide

In a composition reaction, also known as a synthesis reaction, two or more reactants combine to form a single, more complex product. This process reflects the idea that simpler substances come together to create a new entity, which is a hallmark of synthesis reactions.

For example, when hydrogen gas reacts with oxygen gas, they form water (H2O), demonstrating how individual elements combine to yield one compound. This reaction is characterized by the formation of just one product, distinguishing it from other types of chemical reactions where multiple products may emerge or where substances may break apart or rearrange without forming a singular entity. Understanding this fundamental concept is essential for recognizing how specific reactions are categorized in chemistry.