3) In Figure 1, the cooling curve for pure naphthalene was shown. Please answer the following questions using this figure. (a) What is the freezing point of naphthalene? (b) Specify the phases on the cooling curve. (c) Why temperature remains constant during freezing? (d) If you add sulfur into the naphthalene, how does the cooling curve change? Draw the cooling curve of the solution on Figure I and explain briefly. 85 80 75 70 65 5 6 7 8 9 10 11 12 13 14 15 16 17 18 2 3 Time/min Figure 1. The cooling curve of naphthalene Temperature/"C

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Solutions

Solutions can be considered as homogeneous mixtures which contain two or more than two chemical substances. The chemical substance which is the greater part is defined as solvent. And the chemical substance that is dissolved in a solvent is referred to as solute. Solution chemistry plays an important role in chemistry since it supports many commercial applications of solutions.