Question detail
In a thermal decomposition reaction of a metal carbonate, why might the mass appear to decrease?
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 metal carbonate absorbs heat
- B. Carbon dioxide gas escapes into the atmosphere
- C. The metal remains in the container
- D. The reaction produces a solid residue
Answer
Carbon dioxide gas escapes into the atmosphere
Explanation
The loss of carbon dioxide gas during the decomposition process results in a decrease in the measured mass of the system.
Common mistake
Misunderstanding Apparatus Use
Students often confuse the types of apparatus needed for measuring mass changes in reactions involving gases, leading to inaccurate results.
Ensure to review the specific apparatus suitable for measuring mass changes, such as balances and gas syringes, and practice interpreting their use in experiments.
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