Order the following steps to separate a mixture of sodium chloride, sand and iron. I- Mix in water II- Evaporate III- hold a magnet bar above the mixture/solution IV- Filter and dry filtrate
Correct answer: A. III>I>IV>II
- A. III>I>IV>II
- B. II>III>IV>I
- C. I>III>IV>II
- D. I>II>III>IV
Explanation
To obtain dry iron, we first hold a magnet above the mixture. We then mix the remaining salt and sand into water. We filter out and dry the sand. Following this, we evaporate the water to obtain dried sodium chloride.
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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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