Juild and chemical changes
Physical change
Chemical change
One or more new substances are formed.
new substances are made.
Reo is not always given out or taken in.
Energy is always given out or taken in.
It is usually very difficult to reverse.
can be reversed.
Jest yourself
1 Gve three differences between a physical change and a chemical change.
which of the photographs on
the left page are examples of physical changes and which
mes are chemical changes? Explain your answer.
When do chemical changes happen?
Chemical reactions
se san easy way of writing down what happens during a chemical reaction. It can
written as a word equation
as the word
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Answer:
Q3) State which of the following pertain to - chemical changes.
(a) Substance retains its identity.
(b) The change is permanent.
(c) No new substance is formed.
(d) Is easily reversible.
(e) Produces one or more new substances by a change in its composition.
(f) The change is temporary.
(g) The composition and properties of the original substance are not altered.
Solution
Transcript
Solution:
The following changes are chemical -
(b) The change is permanent.
(e) Produces one or more new substances by a change in its composition.
(g) The composition and properties of the original substance are not altered.
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