The periodic table

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Question 7
Easy

This question is about elements in Group 7 of the periodic table.

Table 1 shows the melting points and boiling points of chlorine, bromine, and iodine.

ElementMelting point in °CBoiling point in °C
Chlorine-101-35
Bromine-759
Iodine114184
a.

Using Table 1, determine the state of iodine at 150 °C.

[2]
b.

Balance the equation for the reaction between aluminium and iodine: 2Al+‾I2→2AlI32\text{Al} + \underline{\quad}\text{I}_2 \rightarrow 2\text{AlI}_32Al+​I2​→2AlI3​

[2]
c.

Calculate the relative formula mass (MrM_rMr​) of aluminium iodide, AlI3\text{AlI}_3AlI3​. Relative atomic masses (ArA_rAr​): Al=27\text{Al} = 27Al=27, I=127\text{I} = 127I=127.

[2]

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