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Classifying Chemical Reactions
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Classifying Chemical Reactions
📚 Part 1: Quick classification (Multiple choice)
1. Identify the type of reaction: 2H₂ + O₂ → 2H₂O
Synthesis (combination)
Decomposition
Single replacement
Double replacement
2. Identify the type of reaction: 2H₂O₂ → 2H₂O + O₂
Synthesis (combination)
Decomposition
Single replacement
Double replacement
3. Identify the type of reaction: Zn + 2HCl → ZnCl₂ + H₂
Synthesis (combination)
Decomposition
Single replacement
Double replacement
4. Identify the type of reaction: AgNO₃ + NaCl → AgCl + NaNO₃
Synthesis (combination)
Decomposition
Single replacement
Double replacement
5. Check all that apply: Which features describe decomposition reactions?
One reactant breaks into two or more products
Often requires heat, light or a catalyst
Two compounds exchange ions
Two or more reactants form a single product
6. Identify the type of reaction: 2Na + Cl₂ → 2NaCl
Synthesis (combination)
Decomposition
Single replacement
Double replacement
7. Identify the type of reaction: 2KClO₃ → 2KCl + 3O₂
Synthesis (combination)
Decomposition
Single replacement
Double replacement
8. Identify the type of reaction: Fe + CuSO₄ → FeSO₄ + Cu
Synthesis (combination)
Decomposition
Single replacement
Double replacement
9. Identify the type of reaction: NaOH + HCl → NaCl + H₂O
Synthesis (combination)
Decomposition
Single replacement
Double replacement
10. Check all that apply: Which features describe synthesis reactions?
Two or more reactants combine to form one product
Often releases energy
One reactant breaks down into two or more products
Involves the exchange of ions
✏️ Part 2: Matching & short answers
11. Match each reaction (left) with the correct reaction type (right). Draw lines through the middle.
1. 2Mg + O₂ → 2MgO
2. CaCO₃ → CaO + CO₂
3. Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag
4. HCl + NaOH → NaCl + H₂O
5. 2Na + Cl₂ → 2NaCl
A. Double replacement
B. Single replacement
C. Synthesis (combination)
D. Decomposition
12. Choose one numbered reaction above (write its number) and explain in one sentence why it fits the type you matched.
13. Write one original example equation for a synthesis reaction and one for a decomposition reaction (balanced if you can):
Synthesis: 2H₂ + O₂ → 2H₂O
Decomposition: 2H₂O → 2H₂ + O₂
14. In one sentence: How can you tell a single replacement reaction from a double replacement reaction?
Answer Key for Classifying Chemical Reactions
1. Correct answer: Synthesis (combination)
2. Correct answer: Decomposition
3. Correct answer: Single replacement
4. Correct answer: Double replacement
5. Correct answers: One reactant breaks into two or more products, Often requires heat, light or a catalyst
6. Correct answer: Synthesis (combination)
7. Correct answer: Decomposition
8. Correct answer: Single replacement
9. Correct answer: Double replacement
10. Correct answers: Two or more reactants combine to form one product, Often releases energy
11. Correct matches: 1-C, 2-D, 3-B, 4-A, 5-C
12. Example: "1 fits Synthesis because two reactants combine to form one product."
13. Example equations: Synthesis: 2H₂ + O₂ → 2H₂O, Decomposition: 2H₂O → 2H₂ + O₂
14. A single replacement reaction involves one element replacing another in a compound, while a double replacement reaction involves two compounds exchanging ions.
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