Balancing Chemical Equations

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Date:

📚 Part 1: Key Terms and Understanding

1. Match each term with its correct definition:

Reactants: _________________________________

Products: __________________________________

Coefficients: ______________________________

Subscripts: ________________________________

Word bank: substances formed in a reaction, substances that react together, large numbers that multiply entire molecules, small numbers that show how many atoms are in a molecule

2. The Law of Conservation of Mass states that:

Atoms can be created during chemical reactions

Atoms are neither created nor destroyed in chemical reactions

Mass increases during chemical reactions

Only products matter in chemical equations

3. In the equation 2H₂O, what do the numbers represent?

The coefficient 2 means: _________________________

The subscript ₂ means: _________________________

⚖️ Part 2: Balancing Practice

Instructions: Balance each equation by adding coefficients. Check your work by counting atoms on each side.

4. ___H₂ + ___O₂ → ___H₂O

Check: H atoms - Left: ____ Right: ____ | O atoms - Left: ____ Right: ____

5. ___Mg + ___O₂ → ___MgO

Check: Mg atoms - Left: ____ Right: ____ | O atoms - Left: ____ Right: ____

6. ___Al + ___CuSO₄ → ___Al₂(SO₄)₃ + ___Cu

Check: Al atoms - Left: ____ Right: ____ | Cu atoms - Left: ____ Right: ____

SO₄ groups - Left: ____ Right: ____

7. ___C₃H₈ + ___O₂ → ___CO₂ + ___H₂O

Check: C atoms - Left: ____ Right: ____ | H atoms - Left: ____ Right: ____ | O atoms - Left: ____ Right: ____

🤝 Part 3: Collaborative Challenge

Work with your group to balance these more complex equations. Show all your working and reasoning.

8. ___Ca(OH)₂ + ___H₃PO₄ → ___Ca₃(PO₄)₂ + ___H₂O

9. ___Fe₂O₃ + ___CO → ___Fe + ___CO₂

10. Reflection: Describe one strategy that helps you balance equations successfully:

11. Why is it important that chemical equations are balanced?

Balancing Chemical Equations

Balancing Chemical Equations

📚 Part 1: Key Terms and Understanding

⚖️ Part 2: Balancing Practice

🤝 Part 3: Collaborative Challenge

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