A

MW5093

The three states of matter are represented in the diagrams below.

A B C

a) Identify the diagram that represents

i) A solid.

ii) Steam. C

b) Name a substance that could be represented by diagram B. ____liquid____

c) Explain why substances represented by diagram C can be compressed, but the othersCannot.

Because it is a gas and it can be compressed

______________________________________________________________________

d) Condensation is a change of state. Complete the condensation equation below by putting one letter from the diagrams above (A, B, C) into each circle.

C AB

MW5093

Scoring: Answers/Responses: Y10 (11/02)1 mark (for both correct)

a) i)ii)

AC

very easy

1 mark b) Any liquid, e.g., water. moderate1 mark1 mark1 mark

c) The particles in C are far apart.The particles in C can be moved closer.The particles in A and B are already close and can’t get closer.

difficultdifficultdifficult

1 mark d) moderate

Total: 6 marks

Diagnostic informationAnalysis of responses

d) Percentage of students giving each answer.C B: 49%C A: 7%A B: 10%A C: 17%Missing/No answer: 17%

C B