Question

What types of chemical reactions are the following?
Column A
Al + + GaP → Ga + AlP
2 Mg + O2 → 2 MgO
MgO + BeSe → BeO + MgSe
CH4 + 2O2 → CO2 + 2H2O
2 NaCl → Na + Cl2

Column B
A) Synthesis
B) Decomposition
C) Combustion
D) Double Replacement
E) Single Replacement

Answer 1

Let's analyze the reactions in Column A and determine their types according to the descriptions in Column B.

1. **Al + GaP → Ga + AlP**
- This is a Single Replacement reaction because aluminum (Al) is replacing gallium (Ga) in gallium phosphide (GaP).
- **Answer: E) Single Replacement**

2. **2 Mg + O2 → 2 MgO**
- This is a Synthesis reaction, as magnesium (Mg) and oxygen (O2) combine to form magnesium oxide (MgO).
- **Answer: A) Synthesis**

3. **MgO + BeSe → BeO + MgSe**
- This is a Double Replacement reaction. The metal oxide (MgO) and metal selenide (BeSe) exchange their components to form new compounds (BeO and MgSe).
- **Answer: D) Double Replacement**

4. **CH4 + 2O2 → CO2 + 2H2O**
- This is a Combustion reaction because methane (CH4) is reacting with oxygen (O2) and producing carbon dioxide (CO2) and water (H2O).
- **Answer: C) Combustion**

5. **2 NaCl → Na + Cl2**
- This is a Decomposition reaction, as sodium chloride (NaCl) is breaking down into its elemental components, sodium (Na) and chlorine (Cl2).
- **Answer: B) Decomposition**

In summary:

1. E) Single Replacement
2. A) Synthesis
3. D) Double Replacement
4. C) Combustion
5. B) Decomposition