# Chapter 1 - Sections 1.1-1.8 - Exercises - Conceptual Problems: 142

Diagram C.

#### Work Step by Step

In diagram a) we are shown a mixture of C and $O_{2}$ molecules, while in diagram b) we are shown a mixture of CO and $O_{2}$. Only in diagram c) we are shown $CO_{2}$ molecules. When $CO_{2}$ sublimes, its chemical structure does not change; this is a phase change.

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