P4 Science · Chapter 9brightbit.net/worksheets
Changes of Matter
Name: ______________________Class: ________Date: ____________Score: ____ / 10
- 1.
Which of the following is a physical change?
(a) Burning wood(b) Rusting of iron(c) Melting of ice(d) Cooking an egg
- 2.
Which of the following is a chemical change?
(a) Cutting paper(b) Dissolving sugar in water(c) Burning paper(d) Bending a wire
- 3.
What is the key difference between a physical change and a chemical change?
(a) Physical changes are reversible; chemical changes are not always reversible(b) Physical changes produce new substances; chemical changes do not(c) Physical changes involve heat; chemical changes do not(d) Physical changes only occur in solids
- 4.
When iron rusts, a new substance called iron oxide is formed. This is an example of a ___.
(a) Physical change(b) Reversible change(c) Chemical change(d) State change
- 5.
A student mixes vinegar and baking soda. Bubbles form and the mixture gets slightly cold. What type of change is this?
(a) Physical change — because bubbles form(b) Chemical change — because a new gas is produced and temperature changes(c) Physical change — because the substances can be separated again(d) Neither — because no heat was added
- 6.
Which of the following is evidence that a chemical change has occurred?
(a) The substance changes shape(b) The substance changes colour and a new smell is produced(c) The substance changes from solid to liquid(d) The substance dissolves in water
- 7.
Dissolving salt in water is a physical change. How can you recover the salt from the salt water solution?
(a) By burning the solution(b) By evaporating the water(c) By filtering the solution(d) By cooling the solution
- 8.
Which of the following pairs are BOTH chemical changes?
(a) Melting butter and dissolving sugar(b) Burning candle wax and cooking an egg(c) Breaking glass and freezing water(d) Tearing paper and cutting hair
- 9.
State TWO signs that indicate a chemical change has taken place.
- 10.
A student cuts a piece of aluminium foil into small pieces. Is this a physical or chemical change? Give ONE reason.
Answer key — P4 Science: Changes of Matter
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- 1.(c) Melting of ice
- 2.(c) Burning paper
- 3.(a) Physical changes are reversible; chemical changes are not always reversible
- 4.(c) Chemical change
- 5.(b) Chemical change — because a new gas is produced and temperature changes
- 6.(b) The substance changes colour and a new smell is produced
- 7.(b) By evaporating the water
- 8.(b) Burning candle wax and cooking an egg
- 9.new smell produced and colour change
- 10.physical change — no new substance is formed, it is still aluminium
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