Use this worksheet to practice identifying the four main types of chemical reactions using formulas and visual models.

Let's go through each of the reactions listed and identify the type of chemical reaction for each. The four main types 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 (Replacement): One element replaces another in a compound.
General form: A + BC → AC + B

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

Now, let’s analyze each one:

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1. AB + C → AC + B

- Element C replaces B in compound AB.
- This is a single displacement reaction.

✔ Answer: Single displacement

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2. AB + CD → AD + CB

- The cations and anions swap partners.
- 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. 🔴🔵 → 🔴 + 🔵

- Two atoms (or molecules) break apart into individual atoms.
- This shows a molecule splitting into its constituent parts.
- This is decomposition.

✔ Answer: Decomposition

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6. 🔴🔵 + 🟢🔴 → 🔴🟢 + 🔵🔴

- Two molecules exchange parts.
- Think of it as: AB + CD → AD + CB
- This is double displacement.

✔ Answer: Double displacement

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7. 🔴 + 🟢🔴 → 🔴🔴 + 🟢

- Atom 🔴 replaces 🟢 in compound 🟢🔴.
- This is single displacement.

✔ Answer: Single displacement

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8. 🔴 + 🟢 → 🔴🟢

- Two elements combine to form a compound.
- 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 switch places.
- This is double displacement.

✔ Answer: Double displacement

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11. Zn + 2HCl → ZnCl₂ + H₂

- Zinc displaces hydrogen from hydrochloric acid.
- This is single displacement.

✔ Answer: Single displacement

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12. Na(s) + Cl₂(g) → 2NaCl(s)

- Sodium and chlorine combine to form sodium chloride.
- This is synthesis.

✔ 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 (also called neutralization).

✔ Answer: Double displacement

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14. 2H₂O → 2H₂ + O₂

- Water breaks down into hydrogen and oxygen gas.
- This is decomposition.

✔ Answer: Decomposition

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15. Zn(s) + CuSO₄(aq) → ZnSO₄(aq) + Cu(s)

- Zinc displaces copper from copper sulfate.
- This is single displacement.

✔ 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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