IB Primary Years Programme (PYP) · Science

Changes in materials: reversible and irreversible (5-9 years): Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Changes in materials: reversible and irreversible (5-9 years).

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Question 1

1 mark

What happens to the temperature of pure ice when it begins to melt at normal atmospheric pressure?

Question 2

1 mark

A sealed beaker containing \(50\text{ g}\) of ice is placed on a balance. When the ice completely melts into liquid water, what is the reading on the balance?

Question 3

1 mark

Which of these changes is irreversible, meaning the material cannot be easily changed back to its original state?

Question 4

1 mark

Which of the following processes involves a change of state directly caused by the removal (loss) of heat?

Question 5

1 mark

Which of the following is an example of a reversible change?

Question 6

2 marks

When ice is heated above \(0^{\circ}C\), it changes from a solid to a liquid. Is this process a physical change or a chemical change? Give one reason for your answer.

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Question 7

4 marks

Rusting is a chemical change that occurs when iron reacts with specific substances in the environment. Name the two essential substances required for rusting to occur and explain how a coating of oil prevents an iron tool from rusting.

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Question 8

2 marks

When a puddle of rainwater on the pavement gradually disappears on a sunny day without boiling, what scientific process has taken place?

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Question 9

3 marks

A student carries out two simple investigations in a science classroom:

Activity 1: She tears a sheet of newspaper into small shreds.
Activity 2: With the teacher's supervision, she uses a match to set fire to a piece of dry wood until only grey ash remains.

(a) Identify whether Activity 1 is a physical change or a chemical change.
(b) Identify whether Activity 2 is a physical change or a chemical change.
(c) State which of the two activities produces a new substance with completely different chemical properties.

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Question 10

4 marks

A student investigates how temperature changes affect the three states of matter.

(a) What happens to the speed of movement of particles when a substance absorbs heat energy?
(b) Complete the table by identifying the names of the two phase changes described below:

• Process X: A liquid turns into a gas smoothly from its surface at any temperature below boiling point.
• Process Y: A gas cools down and changes into a liquid.

(c) The student heats liquid paraffin wax until it melts, and then cools it back down to room temperature. Explain why melting and solidifying paraffin wax is classified as a reversible physical change.

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