Answers

2014-11-20T16:41:05+05:30
Two examples of changes in which energy is given out are 
1.when water vapour condenses to water
2.when water freezes to ice.
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2014-11-20T16:54:27+05:30
Candle wax melts on heating and changes to solid state on cooling
when water turns to ice and again turns to water upon cooling

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