8.3. Group VII properties
A subsection of Chemistry, 0620, through 8. The Periodic Table
Listing 10 of 123 questions
Some properties of the halogens are shown in the table. halogen boiling point / °C state at room temperature and pressure fl uorine –188 chlorine –35 gas bromine +59 liquid iodine +184 solid astatine solid Use the information in the table to deduce the boiling point of astatine, the state of fl uorine at room temperature and pressure. When chlorine reacts with aqueous potassium iodide, the solution turns brown. Write a word equation for this reaction. Explain why iodine does not react with aqueous potassium chloride. When sodium reacts with iodine, energy is released. What is the name given to a reaction which releases energy? Explain what happens in terms of electron transfer when a sodium atom reacts with an iodine atom.
0620_m15_qp_22
THEORY
2015
Paper 2, Variant 2
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This question is about halogens. A crystal of iodine was placed at the bottom of a beaker containing the solvent cyclohexane. After 2 days, a purple colour had spread throughout the cyclohexane. at the start after 2 hours after 2 days cyclohexane crystal of iodine Explain these observations using the kinetic particle model. Question 3 continues on the next page. The table shows the properties of some halogens. halogen melting point in °C boiling point in °C density when liquid in g / cm3 colour fluorine –220 –188 chlorine –29 1.56 light green bromine –7 3.12 red-brown iodine 3.96 grey-black Complete the table to estimate: ● the density of liquid fluorine ● the melting point of chlorine.  Is fluorine lighter or darker in colour than chlorine? Explain your answer. What is the physical state of bromine at 40 °C? Give a reason for your answer. Complete the chemical equation for the reaction of aqueous bromine with aqueous potassiumiodide. + 2KI I2 + KBr 
0620_m18_qp_32
THEORY
2018
Paper 3, Variant 2
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The table shows some properties of four halogens. element melting point in °C boiling point in °C density of liquid at melting point in g / cm3 fluorine –220 –188 chlorine –101 1.56 bromine –7 3.12 iodine 4.93 Complete the table by predicting: ● the boiling point of chlorine ● the density of fluorine at its melting point.  Describe the trend in the melting points of the halogens down the group. Deduce the physical state of iodine at 130 °C. Explain your answer. Give the electronic structure of a fluorine atom. Explain why a fluoride ion has a single negative charge. Magnesium reacts with excess fluorine to produce magnesium fluoride. When 2.40 g of magnesium is reacted, 6.20 g of magnesiumfluoride is produced. Calculate the mass of magnesium needed to produce 1.24 g of magnesiumfluoride.  mass of magnesium = g 
0620_m21_qp_32
THEORY
2021
Paper 3, Variant 2
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