VRY URGENT WHAT IS THE DIFFERENCE BETWEEN THE PHYSICAL AND CHEMICAL CHANGES?
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There are two possible definitions for Physical and Chemical changes which I use in school:
1. A physical change is reversible, a chemical change is not. For example, the freezing of water would be a physical change because it can be reversed, whereas the burning of wood is a chemical change - you can't 'unburn' it
2. A physical change is a change in which no new substance is formed; a chemical change results in the formation of one or more new substances. Again, consider the previous examples: Freezing water into ice just results in water molecules which are 'stuck' together - it's still H2O. Whereas burning wood results in ash, carbon dioxide, etc, all new substances which weren't there when you started.
1. A physical change is reversible, a chemical change is not. For example, the freezing of water would be a physical change because it can be reversed, whereas the burning of wood is a chemical change - you can't 'unburn' it
2. A physical change is a change in which no new substance is formed; a chemical change results in the formation of one or more new substances. Again, consider the previous examples: Freezing water into ice just results in water molecules which are 'stuck' together - it's still H2O. Whereas burning wood results in ash, carbon dioxide, etc, all new substances which weren't there when you started.
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physical changes are the changes which can be reversed.it only changes the physical properties. eg-blowing of balloon(without bursting)
chemical changes are the changes which cannot be reversed.the chemical properties change. eg-burning of paper(you can not bring the same paper from the burnt matter)
chemical changes are the changes which cannot be reversed.the chemical properties change. eg-burning of paper(you can not bring the same paper from the burnt matter)
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