Answer the following statement(s) true (T) or false (F)
A. When you mix together two substances, each of 50 m3, you will always arrive at a total volume of 100 m3.
B. When you mix together two substances, each of 50 m3, you will always arrive at a total volume less than 100 m3, since one molecule will always “fill in” the spaces between the other molecule.
C. When you mix together two substances, each of 50 m3, you will always arrive at a total volume greater than 100 m3, since the molecules will take up more space to accommodate a different molecule.
D. When you mix together two substances, each of 50 m3, the nature of the interactions between the molecules will determine whether you arrive at a total volume of 100 m3, or something greater than or less than this value.
E. None of the above are true.
A. Incorrect. This claim, known as “conservation of volume” or “additive volume”, is only true for ideal solutions. Different mixtures may come close to this ideal, but none are perfectly additive and many are very far from it.
B. Incorrect. This is one possibility, but not all substances will behave this way towards other substances.
C. Incorrect. This is one possibility, but not all substances will behave this way towards other substances.
D. Correct. We cannot say anything definite about the excess volume without knowing what the two substances are. Figure 9-2 shows how each of the three possibilities can happen with actual compounds.
E. Incorrect. These four statements cover all possibilities, so one of them must be correct.
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