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Elements, compounds and mixtures practice questions

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a. Explain A student is given two samples of a white crystalline solid, Sample A and Sample B. Both are labelled as 'Compound X'. The known melting point of pure Compound X is 180 °C. The student measures the melting point of Sample A as 180 °C, melting sharply. For Sample B, the student observes melting starting at 170 °C and completing at 178 °C. Explain what these observations indicate about the purity of Sample A and Sample B, referring to the provided data. [4 marks]

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