Question

class 6
cbse
chapter changes around us
science ​

Answer 1

1. Yes, all changes involve exchange of energy.Energy is either absorbed or released duringchanges. Energy is always present and it only takes different forms without which, no change can happen. ... Hence, ice cubes (solid state)changes to water (liquid state) by exchange of energy.

2.Yes all changes involve interactions. No, we cannot mean only physicalinteraction here. It may also be non-physical interactions. ... Chemical reaction between iron and sulphur on heating: By heating, the atoms present in the mixture of iron and sulphur attains energy, interact with each other and form iron sulphide.

Answer 2

Answer:

answer in attachment

Explanation:

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