Question

changes after a
3. Is pulling of rubber string a reversible change? Why?
4. Name any two changes which are physical but irreversible.
5. Give any two examples of expansion from your daily life.
6. Give any two examples of a change involving interaction between two materials​

Answer 1

Answer:

3. no it is not reversible

because this change occurs once

4. breaking of glass,pulling rubber

5. freezing water ,heating wax

6. salt and water

Answer 2

Explanation:

3. pulling of rubber string is reversible is since after stretching of the rubber string it will come back to its original size

4. change 1 - tearing of paper

change 2 - freezing of water to ice.

5. write done how a fire alarm gets activated on its own, the iron rim is first heated to expand its size a bit and then it is adjusted on the wooden cart's wheel than cold water is poured over the rim to get it back to the original size and keeping the wheel nice and firm.

6. whenever, sodium and chlorine are mixed, it results in a reaction which is a chemical change leads to the formation of salt, whenever paper is in the path of source of heat it burns and turns into ashes. this are some examples of change involving reaction between two substances.

my hands got tired writing this...... hope it helps.......... check for flaws ☺️

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