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Short Answer Type Questions
1. What do you understand by a reversible change? Give an example.
2. What do you understand by an irreversible change? Give an example.
3. What is a physical change? Give an example.
4. What is a chemical change? Give an example.
5. Burning of candle is a physical as well as a chemical change. How?
6. What happens when lemon juice is mixed with baking powder? Is it a physical or a chemical
Justify your answer.
Idli batter is steamed to get idlis. Is it a reversible or an irreversible change? Justify your answe
Think of at least six changes and classify them as reversible and irreversible changes.
Answers
Answer:
irreversible substance means the thing which cannot change like raw mango conversations of milk into curd
Explanation:
if curd had prepared you can not convert curd to milk it is irreversible substance
Answer:
process which can't be reversed are know as irreversible change. for example :- burning of paper.
Process which can be reversed are know as reversible change. For example:- glowing of bulb.
Physical change's are change's which are done physically by human,etc. For example:- tearing of paper.
Chemical change's are change's which happens chemically. For example:- roasting of fresh.
Burning of candle is a physical as well as a chemical change because it losses some amount of wax during burning but some wax is also left. This is why it is physical and chemical change both.