B. recap Questions
1.how can we determine the purity of pure substance?
2.what will happen to the temperature of the solid samples if there is presence of impurity?
1.how can we determine the purity of pure substance?
2.what will happen to the temperature of the solid samples if there is presence of impurity?
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Answer:
1. Several physical properties can be used to identify a pure substance. Boiling point, melting point, color, density and solubility are examples of physical properties. One of the easiest ways to prove the purity of a substance is to compare the substance to a certified pure sample.
2. The solid has to be heated to a certain temperature for destruction of this structure and melting of the solid. The presence of impurities therefore weakens the lattice, rendering it less stable. The compound then melts at a lower temperature.
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