Types of Chemical Reactions - Free Printable

Let's solve each of the 15 chemical reactions and identify their types. The four main types of chemical reactions are:

1. Synthesis (Combination): Two or more substances combine to form a single product.
- General form: A + B → AB

2. Decomposition: A single compound breaks down into two or more simpler substances.
- General form: AB → A + B

3. Single Displacement (Single Replacement): One element replaces another in a compound.
- General form: A + BC → AC + B

4. Double Displacement (Double Replacement): Ions in two compounds exchange partners to form two new compounds.
- General form: AB + CD → AD + CB

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Now, let’s go through each reaction:

#### 1. AB + C → AC + B
- Element C displaces B from compound AB.
- This is a single displacement reaction.

✔ Answer: Single displacement

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#### 2. AB + CD → AD + CB
- Ions A and C swap partners with B and D.
- This is a double displacement reaction.

✔ Answer: Double displacement

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#### 3. AB → A + B
- A compound breaks down into its elements.
- This is a decomposition reaction.

✔ Answer: Decomposition

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#### 4. A + B → AB
- Two elements combine to form a compound.
- This is a synthesis reaction.

✔ Answer: Synthesis

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#### 5. [Diagram: AB → A + B]
- One molecule splits into two separate atoms.
- This represents decomposition.

✔ Answer: Decomposition

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#### 6. [Diagram: AB + CD → AD + CB]
- Two molecules exchange parts (A with C).
- This is double displacement.

✔ Answer: Double displacement

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#### 7. [Diagram: A + BC → AC + B]
- Atom A replaces B in compound BC.
- This is single displacement.

✔ Answer: Single displacement

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#### 8. [Diagram: A + B → AB]
- Two atoms combine to form a molecule.
- This is synthesis.

✔ Answer: Synthesis

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#### 9. CaCO₃ → CaO + CO₂
- Calcium carbonate breaks down into calcium oxide and carbon dioxide.
- This is a decomposition reaction.

✔ Answer: Decomposition

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#### 10. NaCl + AgNO₃ → NaNO₃ + AgCl
- Sodium and silver ions swap partners.
- This is a double displacement reaction.

✔ Answer: Double displacement

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#### 11. Zn + 2HCl → ZnCl₂ + H₂
- Zinc displaces hydrogen from hydrochloric acid.
- This is a single displacement reaction.

✔ Answer: Single displacement

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#### 12. Na(s) + Cl₂(g) → 2NaCl(s)
- Sodium and chlorine combine to form sodium chloride.
- This is a synthesis reaction.

✔ Answer: Synthesis

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#### 13. HCl + NaOH → NaCl + H₂O
- Acid and base react to form salt and water.
- This is a double displacement (specifically, an acid-base neutralization).

✔ Answer: Double displacement

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#### 14. 2H₂O → 2H₂ + O₂
- Water decomposes into hydrogen and oxygen gases.
- This is a decomposition reaction.

✔ Answer: Decomposition

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#### 15. Zn(s) + CuSO₄(aq) → ZnSO₄(aq) + Cu(s)
- Zinc displaces copper from copper sulfate.
- This is a single displacement reaction.

✔ Answer: Single displacement

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✔ Final Answers:

| Number | Reaction Type |
|--------|----------------|
| 1 | Single displacement |
| 2 | Double displacement |
| 3 | Decomposition |
| 4 | Synthesis |
| 5 | Decomposition |
| 6 | Double displacement |
| 7 | Single displacement |
| 8 | Synthesis |
| 9 | Decomposition |
| 10 | Double displacement |
| 11 | Single displacement |
| 12 | Synthesis |
| 13 | Double displacement |
| 14 | Decomposition |
| 15 | Single displacement |

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Summary of Patterns:

- Synthesis: Reactions where substances combine (e.g., 4, 8, 12)
- Decomposition: One substance breaks apart (e.g., 3, 5, 9, 14)
- Single displacement: One element replaces another (e.g., 1, 7, 11, 15)
- Double displacement: Ions switch partners (e.g., 2, 6, 10, 13)

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