identify the following as physical and chemical changes
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identify the following as physical and chemical changes
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Answer:
a and b are physical change
and c an d are chemical change
Explanation:
tearing of a paper and cutting of fruits is chage phycially and burning of coal and rusting of iron is the changes chemically
Answer:
(a) Tearing of paper - physical change
We say that tearing of paper is a physical change , because the chemical composition of paper hasn't changed here and the torn paper pieces can be glued together to get their normal form back .
(b) Cutting of fruits - physical change
Cutting of fruits is said to be a physical change because there is only a change in the physical form of the fruits . The chemical composition of the fruits does not change when we cut them . So , cutting of fruits is a physical change .
(c) Burning of coal - chemical change
Burning of coal is said to be a chemical change because during the burning process of coal there is a change in the coal's chemical composition due to the carbon in the coal changing into carbon dioxide ( this change cannot be reversed ) .
(d) Rusting of iron - chemical change
Rusting of iron is said to be a chemical change because when iron rusts there is a change in it's chemical composition . During rusting where iron is exposed to moisture and oxygen , iron changes into iron oxide . This
process is also called as oxidation reaction . Hence rusting of iron is said to be a chemical change .
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