1) do all changes involve exchange of heat energy? give examples supporting your answer. 2) Do all changes involves interaction? By interaction do we mean only physical interaction?Find out examples of changes that effect each other non physically . 3) why does mother put two glass tumblers that fixed tightly to each other in hot water? 4)why is the change of season a periodic change?
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1) Yes, all changes involves exchange of Heat. They can be endothermic or exothermic
For example water absorb heat energy to convert into steam and release heat energy when change into ice.
2) Yes, all changes around us involves interaction between two or more materials. They can be either physical or chemical.
writing through pencil, hitting the ball on wall.
3) On heating solids will expand. Due to this reason two glass tumblers are placed that fixed tightly to each other in hot water. After some time the tumblers are separated very easily as the lower tumbler gets expanded.
4) Some changes are periodic changes as they can repeat themselves. Change of season is a periodic change.
For example water absorb heat energy to convert into steam and release heat energy when change into ice.
2) Yes, all changes around us involves interaction between two or more materials. They can be either physical or chemical.
writing through pencil, hitting the ball on wall.
3) On heating solids will expand. Due to this reason two glass tumblers are placed that fixed tightly to each other in hot water. After some time the tumblers are separated very easily as the lower tumbler gets expanded.
4) Some changes are periodic changes as they can repeat themselves. Change of season is a periodic change.
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