Lesson: Chapter 8 — Heat changes in chemical reactions

Measuring a heat of reaction 4 of 5 Reset answers

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Question 4

Why must the physical states be given when a heat change is stated?

A Because gases do not react B Because the equation will not balance otherwise C Because the heat change depends on them D It is only a convention with no effect

The right answer is the one marked above.

Because the heat change depends on them. Solid NaOH gives a different value from aqueous NaOH in the same reaction.

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