What do you understand by physical change
and chemical change? Classify the following as
physical or chemical changes :
(i) Dissolving salt in water
(ii) Electric current is passed through water and
it is broken down into hydrogen and oxygen
(iii) Evaporation of alcohol
(iv) Digestion of food
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Answers
Answer:
Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
Step-by-step explanation:
physical change
For example salt dissolving in water is usually considered to be a physical change, however the chemical species in salt solution (hydrated sodium and chlorine ions) are different from the species in solid salt.
Explanation: passing of electric current, through water and the water breaking down into hydrogen and oxygen gases is a chemical change.
Answer: Evaporation of alcohol is a physical change, burning of the same is a chemical change.
Digestion of food is a chemical change because the large macromolecules are broken down into simpler molecules by the enzymes present in the stomach and the intestines. It is a chemical change because it involves various chemical reactions. Hence the answer is chemical change.
Answer:
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