1.
Define the following terms.
(a) Reversible change
Answers
A reversible change is a chemical change where no new materials are created and the original material can be recovered. Examples include freezing water to make ice or melting chocolate.
The key difference between a reversible change and an irreversible one lies in whether the chemical properties involved change - in a reversible one, they stay the same, whereas in an irreversible one they change.
Typically, if a material physically changes, it is reversible, whereas if it changes chemically, it is not.
Why are reversible changes important to learn about?
As with all chemical reactions, reversible changes help to explain some of the things we see happening in the world around us.
Every time children melt, freeze or (in later life) boil something, they will be able to recognise to some degree what processes are allowing it to happen.
As well as developing their scientific knowledge, it is also fascinating to learn about.
When are children taught about reversible changes?
KS1 is usually the first time that students will be properly introduced to the concept of reversible and irreversible changes.
With the help of age-friendly worksheets and experiments, they will be able to identify on a basic level what the difference is between a reversible and irreversible change. An easy experiment to do is melting chocolate, which helps to practically exhibit the first phase of a reversible change.
Answer:
it is a chemical change where no new materials are created and the original material can be recovered.
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