Give one example in each case:
Change occurs on cooling but can be reversed.
Reversible changes:
Irreversible changes:
Example of change that occurs on cooling but can be reversed:
Question 8
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a: (a) physical change that can be reversed (b) chemical change that can be reversed (c) physical change that cannot be reversed (d) chemical change that cannot be reversed
Change occurs on mixing two substances, but can be reversed.
Change occurs on heating but cannot be reversed.
Question 15
Give one example in each case. Change which occurs on heating but can be reversed. Change which occurs on heating but cannot be reversed. Change which occurs on cooling but can be reversed. Change which occurs on mixing two substances but can be reversed. Change which occurs on mixing two substances but cannot be reversed.