Question 1
1 markHow can the purity of a solid substance be reliably assessed by physical testing?
GCE O-Level · Chemistry (6092)
Methods of Purification and Analysis: Practice Questions
5 multiple-choice questions marked as you go, and 2 written questions with worked solutions. All on Methods of Purification and Analysis.
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Question 2
1 markIn a paper chromatography experiment, the solvent front traveled \(15.0 \text{ cm}\) from the baseline. A dye spot moved \(6.0 \text{ cm}\) from the baseline. What is the \(R_f\) value of this dye?
Question 3
1 markA solid mixture contains three substances: ammonium chloride, sodium chloride, and sand. Which sequence of steps successfully separates all three pure substances?
Question 4
1 markA student is provided with a heterogeneous mixture of sand and water. Which method of separation should be used to obtain dry sand?
Question 5
1 markA solid organic substance is suspected to be impure. Which observation during a melting point determination best confirms that the substance is impure?
Question 6
2 marksWhat is the effect of a soluble impurity on the melting point and boiling point of a pure substance?
Write your answer out first, then check it against the worked solution.
Question 7
2 marksWhich separation technique is most suitable to separate a mixture of two miscible liquids with significantly different boiling points?
Write your answer out first, then check it against the worked solution.
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