Experiment: A mixture of iron filings and sulfur was heated strongly in a test tube.Observation: A black solid formed that was attracted by a magnet only slightly.Question: What does this demonstrate?
Correct answer: B. A compound (iron sulfide) was formed with unique properties.
- A. Iron underwent a chemical change to form a new compound with sulfur.
- B. A compound (iron sulfide) was formed with unique properties.
- C. The mixture remained unchanged despite heating.
- D. Iron reacted with sulfur to form a new substance, not rust.
Explanation
The correct answer is Option B: A compound (iron sulfide) was formed with unique properties. This demonstrates a chemical reaction where iron and sulfur combined to create a new compound, iron sulfide, distinguished by its distinct properties. Option A is incorrect as it describes a physical change, not a chemical one. Option C is inaccurate as a new substance was indeed formed. Option D is incorrect because rust formation involves iron reacting with oxygen, not sulfur.
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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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