IB Chemistry SL S1.1 Introduction to the particulate nature of matter questions

Exam-style multiple choice and written questions with full markschemes. Check multiple choice answers straight away, or type, photograph or draw a written answer and get it marked.

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Question 1

Multiple choiceMedium1 mark

A pure substance undergoes one change of state. The diagrams show its particles immediately before and after the change. Which named process describes the change?

BeforeAfterone change
Show answer and explanation

Answer: A. The close, regular arrangement before the change represents a solid; the widely separated particles after it represent a gas. The direction is solid → gas, which is sublimation.
B: reverses the direction: deposition is gas → solid.
C: identifies the initial solid but treats the final state as liquid; melting is solid → liquid.
D: identifies the final gas but assumes the initial state is liquid; vaporization is liquid → gas.
Remember: identify both states and the direction of change.

Question 2

Paper 2Hard8 marks

A sample of ice is heated at constant pressure. Figure 1 shows the structural formula of the substance. The temperature is recorded at intervals.

HOH
Time / minTemperature / °C
0.0−8.2
2.0−2.1
4.00.0
6.00.0
8.08.1
10.032.2
(a)

State the formula of each particle in the sample, using Figure 1.

[1]
(b)

Convert the temperatures recorded at 8.0 min and 10.0 min to kelvin, to the nearest kelvin.

[2]
(c)

Identify the time interval during which the sample is changing state.

[1]
(d)

A student concludes: “At 10.0 min, the average kinetic energy of the particles is about four times its value at 8.0 min, because 32.2 is about four times 8.1. The average kinetic energy also continues to increase from 4.0 to 6.0 min because the sample is still being heated.”

Evaluate both statements, using the data and your answer to (b).

[4]

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