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

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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
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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.

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