4. Give an example of each to justify the law of conservation of mass when matter undergoes:
(a) A physical change
(b) A chemical change
Answers
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Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction or a physical transformation.
(a)Tearing up paper :- does not change the chemical composition of the paper, but merely changes the size of the paper. In both examples, there is no change in identity of the atoms involved, or even the general chemical composition of the paper. If it were possible to look at and track the individual molecules in the paper before and after the change, then it will be possible to see that the number of molecules did not change.
(B)hydrogen gas can react with oxygen gas to form water. -:While the individual atoms are still there, the chemical composition is different. This involved a rearrangement of chemical bonds. However, it can easily be justified where the atoms went - nothing disappeared, and nothing just appeared out of nowhere - mass is neither created nor destroyed.
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