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Thursday 9 November 2017

Chemical and Physical change

Chemical and Physical change

What are chemical changes?
Chemical changes are changes that can’t go back to how it was at the start.

Example:
Bread is an example of chemical change, because once you toast it, it becomes toast. And you cannot change it back to bread again because it will just stay the same just get soft. This means that the change is irreversible.

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This is also an example of a chemical change, because once you bake the cake it can’t be turned into the batter again.

Facts about Chemical changes
  • Chemical changes cannot be reversed.
  • You can have both and chemical and physical change at the same time.
  • Chemical changes produce something new.
  • Chemical changes happen everyday
  • There are different kinds of chemical reactions


What are physical changes?
Physical changes are changes that affect the form of a chemical substance. The changes that are made can also be reversible.

Example:
An example of a physical change taking a glass of water and freezing it. Once it is frozen it had turned into ice. But if you put it in a warm spot it will melt and turn into water again. This means that the change is reversible.

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This is also an example of physical change because one the chocolate melts you can freeze it so that it turns into chocolate again. It is reversible.

Facts about physical changes
  • Physical changes can be reversed

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