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Figure 4 shows information about some of the elements in group 7 of the periodic table - Edexcel - GCSE Chemistry - Question 3 - 2016 - Paper 1

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Figure 4 shows information about some of the elements in group 7 of the periodic table. Astatine is below iodine in group 7 of the periodic table. Estimate the boi... show full transcript

Worked Solution & Example Answer:Figure 4 shows information about some of the elements in group 7 of the periodic table - Edexcel - GCSE Chemistry - Question 3 - 2016 - Paper 1

Step 1

Estimate the boiling point of astatine.

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Answer

To estimate the boiling point of astatine, we observe the trend in boiling points of the neighboring halogens in group 7. The boiling point of iodine is 184 °C, and following the trend, we can infer that astatine, being below iodine, will have a boiling point higher than that of iodine but less than that of the neighboring element, which can be estimated around 210 °C.

Step 2

Complete the word equation for the reaction between bromine and potassium astatide.

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Answer

bromine + potassium astatide → iodine + potassium bromide

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