Reactants and Products
Learning Objective
I can identify the reactants and products in a chemical reaction.
Key Concepts
In a chemical reaction, new substances are created due to the rearrangement of atoms.
The substances present before a chemical reaction are called reactants, while the substances produced after the reaction are called products.
During a chemical reaction, the mass of the reactants and the mass of the products are the same because atoms are only being rearranged, not created or destroyed.
Practice Questions
This lesson includes 12 practice questions to reinforce learning.
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1. What is the defining characteristic of a chemical reaction, as opposed to a physical change?
2. In the reaction of hydrogen and oxygen to form water, identify the reactants and the product.
3. Explain why the mass of the reactants and products in a chemical reaction remains the same (assuming all products are captured).
...and 9 more questions
Educational Video
Chemical reactions | Middle school chemistry | Khan Academy
Khan Academy