MediumChemistryHigh School (9–10)GeneralChemical Reactions › Energy Changes and CorrosionNumericalBoard ExamAPA-LevelIB
5.6 g of quicklime, CaO, reacts with 200 g of water.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
of quicklime, CaO, reacts with of water. The reaction gives out for every mole of CaO (). Find the rise in temperature of the water. Use .
Need a reminder? The key ideaShow
An exothermic change gives out heat, so the surroundings warm up. An endothermic change takes heat in, so they cool. Heat taken by water: , with .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Moles. .
Step 2. Heat. .
Step 3. Rise. .
Answer: about .
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