You will learn about the enthalpy of fusion and sublimation.
The energy required to cause the structure of a solid to collapse is called the enthalpy of fusion. The melting points and the enthalpy of fusion of some solids are given in Table 13.7 on page 626. Some molecules will go directly from the solid state to the gas state when energy is applied to the solid form, a process called sublimation. The sublimation of ice is used in the very practical application of maintaining a frost-free refrigerator.
1.) Work Exercise 13.10 on page 629 of your text.
2.) Comment on a molecular level about why a substance would sublime rather than melt. Post your comment on the WebCT bulletin board.
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