what is the difference between chemical change and physical change?
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what is the difference between chemical change and physical change?
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Answer:
A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity.
Often, physical changes can be undone, if energy is input. The only way to reverse a chemical change is via another chemical reaction.
Examples of Chemical Changes:
Examples of Physical Changes:
Explanation:
Answer:
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.
For example, if a piece of paper is cut up into small pieces it still is paper. This would be a physical change in the shape and size of the paper. If the same piece of paper is burned, it is broken up into different substances that are not paper.
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.
If one decided to mix sugar into water to make sugar water, this would be a physical change as the water could be left out to evaporate and the sugar crystals would remain