Chemistry Regents Practice Test 2026 – Complete Prep Resource

Question: 1 / 400

What is a synthesis reaction?

A reaction where one substance decomposes

A reaction where two or more simple substances combine to form a more complex product

A synthesis reaction is defined as a chemical reaction in which two or more simple substances combine to form a more complex product. This type of reaction can be expressed with the general equation:

A + B → AB

Here, A and B represent the individual reactants, which typically are elements or simpler compounds, and AB is the more complex product formed from their combination.

Synthesis reactions are prevalent in various chemical processes, such as the formation of water from hydrogen and oxygen gases or the creation of ammonia from nitrogen and hydrogen gases. In essence, these reactions build up larger molecules from smaller, simpler units, which is why option B accurately describes a synthesis reaction. Understanding this concept is crucial for identifying and predicting chemical behaviors and reactions in both academic and real-world contexts.

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A reaction that releases energy in the form of heat

A reaction that involves the transfer of electrons

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