Lesson: Chapter 8 — Heat changes in chemical reactions

Exothermic and endothermic reactions 1 of 5 Reset answers

Clear all your answers?

This erases every answer in this set and starts you again at question one. Your score will be gone.

Type these four numbers to confirm:

Those numbers don't match. Look at them again and type them.

Yes, clear Keep them

Question 1

Solid ammonium chloride is dissolved in water and the temperature falls. Why?

A The water evaporates B A gas is formed C Heat is absorbed D Heat is given out

The right answer is the one marked above.

Heat is absorbed. Dissolving sodium hydroxide does the opposite: it gives out heat and the temperature rises.

Answer the question to continue.