Atoms, Molecules, and Reactions
Grade 645 min
Learning Objective
I can build a model to show that the number of atoms stays the same during a chemical reaction, so mass is conserved.
Lesson Flow
Watch Video
Chemical and Physical Changes – Quiz Edition
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Practice
7 questions • Short answer
Exit Ticket
“If you start with 2 atoms of hydrogen (H) and 1 atom of oxygen (O), and they react to form water (H₂O), how many atoms of hydrogen and oxygen are in the water molecule? In the reaction CH₄ + 2O₂ → CO₂ + 2H₂O, how many carbon (C) atoms are there on the left side of the equation (reactants)? How many carbon atoms are there on the right side of the equation (products)? ”
Teacher Guide
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- Answer keys for all questions
- Differentiation strategies
- Extension activities
- Printable student handouts
