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How is the melting Of ice, a physical change?
When we melt ice, it is a physical change because we only add energy.
We added enough energy to create a phase change from solid to liquid. No chemical changes take place when we melt the ice. The water molecules are still water molecules.
Physical actions, such as changing temperature or pressure, can cause physical changes. The melted ice may be refrozen, so melting is a reversible physical change. Physical changes that involve a change of state are all reversible.
Recapitulation: Physical change is the change of that matter where only the appearance or molecular arrangement of matter changes without changing its composition.
Examples: Boiling and freezing of water, melting of wax, mixing sand and grains, crumpling a paper bag, chopping a wood etc.
Properties of physical change are as follows:
• Most of the physical changes are reversible. The original form of the matter can be attained.
• It is a temporary change and no new substance is formed.
• During a physical change, no energy is absorbed or released
• Physical change causes a change in physical properties such as shape, size, etc.
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