Question detail
What is the reaction of magnesium with oxygen?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Group 2, the alkaline earth metals
Question
- A. Magnesium reacts with oxygen to form magnesium oxide.
- B. Magnesium reacts with oxygen to form magnesium hydroxide.
- C. Magnesium reacts with oxygen to form magnesium sulfate.
- D. Magnesium does not react with oxygen.
Answer
Magnesium reacts with oxygen to form magnesium oxide.
Explanation
When magnesium burns in oxygen, it forms magnesium oxide (MgO) as a product, demonstrating its reactivity with oxygen.
Common mistake
Misunderstanding Group 2 Metal Reactivity
Students often confuse the reactivity of Group 2 metals with non-metals, thinking they react similarly with oxygen, water, and acids.
To clarify, remember that Group 2 metals react with oxygen to form metal oxides, with water to produce hydroxides and hydrogen gas, and with acids to yield salts and hydrogen gas. For example, the reaction of magnesium with water can be represented as: 1. **Formula**: Mg + 2H2O → Mg(OH)2 + H2 2. **Substitution**: Here, magnesium reacts with water to form magnesium hydroxide and hydrogen gas. 3. **Working**: The magnesium displaces hydrogen from water, resulting in the formation of magnesium hydroxide. 4. **Answer**: The products are magnesium hydroxide (Mg(OH)2) and hydrogen gas (H2). 5. **Units/Conclusion**: This shows that Group 2 metals react with water to produce hydroxides, which is a key characteristic of their reactivity.
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