第 1 题
1 分How can the purity of a solid substance be reliably assessed by physical testing?
GCE O-Level · Chemistry (6092)
Methods of Purification and Analysis：练习题
5 道选择题即时批改，另有 2 道文字题附完整解题步骤，全部围绕「Methods of Purification and Analysis」。
7 道题目9 分免费，无需注册
第 2 题
1 分In 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?
第 3 题
1 分A solid mixture contains three substances: ammonium chloride, sodium chloride, and sand. Which sequence of steps successfully separates all three pure substances?
第 4 题
1 分A student is provided with a heterogeneous mixture of sand and water. Which method of separation should be used to obtain dry sand?
第 5 题
1 分A solid organic substance is suspected to be impure. Which observation during a melting point determination best confirms that the substance is impure?
第 6 题
2 分What is the effect of a soluble impurity on the melting point and boiling point of a pure substance?
先自己写一遍答案，再对照解题步骤。
第 7 题
2 分Which separation technique is most suitable to separate a mixture of two miscible liquids with significantly different boiling points?
先自己写一遍答案，再对照解题步骤。
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