Question detail
What happens to the mass of a metal when it reacts with oxygen to form a metal oxide?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations
Question
- A. The mass decreases
- B. The mass remains the same
- C. The mass increases
- D. The mass becomes unpredictable
Answer
The mass increases
Explanation
The mass increases because oxygen from the air is added to the metal during the reaction, forming a heavier metal oxide.
Common mistake
Misunderstanding Mass Increase
Students often think that the mass of a metal oxide is greater than the mass of the metal because the metal gains weight during the reaction.
Explain that the increase in mass is due to the oxygen from the air combining with the metal, which adds to the total mass of the product.
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