Experiment: Magnesium ribbon was burned in a jar of carbon dioxide.Observation: A white ash was formed and black carbon was deposited.Question: What does this show?
Correct answer: A. Magnesium can reduce CO₂ to carbon.
- A. Magnesium can reduce CO₂ to carbon.
- B. Magnesium evaporates in CO₂.
- C. Carbon dioxide is neutral gas.
- D. CO₂ acts as an oxidizing agent.
Explanation
The correct answer is that Magnesium can reduce CO₂ to carbon. The white ash and black carbon formed in the experiment indicate a chemical reaction between magnesium and carbon dioxide. Magnesium acted as a reducing agent, leading to the reduction of carbon dioxide to carbon. The other options are incorrect because they do not explain the observed results and do not involve a chemical reaction between magnesium and carbon dioxide.
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About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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