CAIE IGCSE Chemistry 1.1.3 Changes of State in Terms of Melting Questions

Use temperature data and the particle model to explain physical changes of state.

Exam points

deduce a substance’s physical state from melting and boiling point data
identify and name changes of state
explain energy transfer and particle changes during a change of state
distinguish boiling from evaporation
explain how particle energy, separation and arrangement change during state changes

[Maximum number: 2]

This question is about the elements sodium and fluorine and the compound sodium fluoride.

Some properties of sodium, fluorine and sodium fluoride are shown in Table 3.1.

Table 3.1

Deduce the physical state of fluorine at $-200^{\circ} \mathrm{C}$ . Use the data in Table 3.1 to explain your answer.
physical state
explanation

M1 liquid(1)

M2 BOTH melting point is below $-200^{\circ} \mathrm{C}$ AND boiling point is above $-200^{\circ} \mathrm{C}(1)$

OR

BOTH $-200^{\circ} \mathrm{C}$ is higher than $-220^{\circ} \mathrm{C} /$ melting point AND lower than $-188^{\circ} \mathrm{C} /$ boiling point(1)

OR

-200 ${ }^{\circ} \mathrm{C}$ is between melting point or $-220^{\circ} \mathrm{C}$ and boiling point or

$-188^{\circ} \mathrm{C}(1)$

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CAIE IGCSE Chemistry 1.1.3 Changes of State in Terms of Melting Questions question 1