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

Name physical changes in CAIE IGCSE Chemistry from the starting and final states, then use temperature conditions and observations to distinguish boiling from evaporation.

Exam points

Name a change of state from its initial and final states, including melting ice and condensing zinc gas into molten zinc.
Distinguish boiling at a specific temperature with bubbles from evaporation over a range of temperatures.
Use a liquid’s boiling point and the stated conditions to identify evaporation below the boiling point rather than boiling.

[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