QUESTION 8 Consider the heating curve of H20 shown below. Select all that is cor

Question

QUESTION 8 Consider the heating curve of H20 shown below. Select all that is correct. 100 75 50 25 25 -50 400 800 1200 1600 0 2400 200 Heat absorbed (kJ) O A Portions A C, and E represent changes in the average kinetic energy Portion B represents the heat of fusion. Portion D represents sublimation. Portions B and D represent a change in the potential energy but no change in the average kinetic energy B. QUESTION 9 Dioxane, C4HgO2, has an enthalpy of fusion of 12.85 kJmol and its melting point temperature is 11.0 C. How much heat is required to transform 142 g of solid dioxane at 11.0 C into liquid dioxane, also at 11.0 ? [MM of C4H8O2-88.10 g mol] O A 1.60 k B. 2.59 k o D. 22.8 k

Explanation / Answer

Ans 8

Portion A represents the increase in temperature or heating the solid.

Portion B represents the phase change at constant temperature i.e. Melting (heat of fusion).

Portion C represents the increase in temperature or heating the liquid.

Portion D represents the phase change at constant temperature i.e. Vaporization

Portion E represents the increase in temperature or heating the gas.

At constant temperature, the average kinetic energy remains the same, only chemical potential energy changes.

Portions B and D represent change in potential energy but no change in average kinetic energy.

While heating, temperature changes so the average kinetic energy also changes.

Portions A, C and E represent change in temperature so changes in average kinetic energy occurs.

None of the portion represents sublimation.

Option A, B and D are correct.

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