📚 Understanding Chemical Equations

1. What does the Law of Conservation of Mass state?

Matter can be created during chemical reactions

Matter cannot be created or destroyed in chemical reactions

Mass always increases in chemical reactions

Mass always decreases in chemical reactions

2. In a balanced chemical equation, what must be equal on both sides?

The number of molecules

The number of atoms of each element

The total mass of compounds

The number of different elements

3. What are coefficients used for in chemical equations?

⚖️ Steps to Balance Chemical Equations

Remember these steps:

1. __________ atoms of each element in reactants and products

2. Add __________ to balance atoms for each element

3. __________ that the number of atoms for each element is equal on both sides

4. Complete the steps above by filling in the missing words.

🧪 Balancing Practice

5. Balance the following chemical equations by adding coefficients:

a) _____ H₂ + _____ O₂ → _____ H₂O

Show your working:

b) _____ Mg + _____ O₂ → _____ MgO

Show your working:

c) _____ N₂ + _____ H₂ → _____ NH₃

Show your working:

d) _____ Fe + _____ O₂ → _____ Fe₂O₃

Show your working:

6. For equation (a) above, explain why balancing is necessary using the Law of Conservation of Mass:

🎯 Quick Quiz

7. Count the atoms in this balanced equation: 2H₂ + O₂ → 2H₂O

Hydrogen atoms on left side: _____

Oxygen atoms on left side: _____

Hydrogen atoms on right side: _____

Oxygen atoms on right side: _____

8. True or False: In the equation CH₄ + 2O₂ → CO₂ + 2H₂O, mass is conserved.

True

False

Explain your answer: ________________________________

9. Why is it important to balance chemical equations in science?

10. Peer Discussion: Compare your answers with a classmate. Did you get the same balanced equations? Discuss any differences and work together to find the correct answers.

Space for notes from peer discussion:

Balancing Chemical Equations Worksheet

Balancing Chemical Equations Worksheet

📚 Understanding Chemical Equations

⚖️ Steps to Balance Chemical Equations

🧪 Balancing Practice

🎯 Quick Quiz

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