Evidence of Chemical Reactions
Learning Objective
I can identify evidence of chemical reactions.
Key Concepts
In a chemical reaction, the original substances are called the reactants, and the new substances that are formed are called the products.
The metal on the bicycle was undergoing a chemical reaction that produced rust, which is the result of iron atoms combining with oxygen molecules from the air.
Using visual models, like marshmallows, can help students understand how atoms rearrange into different molecules during a chemical reaction.
Practice Questions
This lesson includes 12 practice questions to reinforce learning.
View questions preview
1. What are the substances called that are present at the beginning of a chemical reaction?
2. What is formed during a chemical reaction?
3. The rusting of a bicycle involves iron atoms combining with what?
...and 9 more questions
Educational Video
Good Thinking! — Chemical Reactions in Action
Smithsonian Science Education Center (SSEC)