Question

difference between chemical change & physical change. ( any 3)​

Answer 1

In physical change, no new substance is formed. A chemical change is always accompanied by one or more new substance(s). In a physical change, no energy is produced. In a chemical change, energy is produced (heat, light, sound, etc.)

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Answer 2

A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.

Physical changes can be reversed, chemical changes cannot be reversed with the substance changed back without extraordinary means, if at all. For example, a cup of water can be frozen when cooled and then can be returned to a liquid form when heated.

When heat is given off in a chemical change or reaction, it is called an exothermic reaction. When heat is absorbed in a chemical change or reaction, it is called an endothermic reaction.

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