8.3. Group VII properties
A subsection of Chemistry, 0620, through 8. The Periodic Table
Listing 10 of 123 questions
Chlorine, bromine and iodine are halogens. Chlorine can be made in the laboratory by heating manganese(oxide with concentrated hydrochloric acid. MnO2+ 4HCl → MnCl 2+ 2H2O+ Cl 2Calculate the volume of 8.00 mol / dm3 HCl needed to react with 3.48 g of MnO2. • moles of MnO2 used mol • moles of HCl needed mol • volume of HCl needed cm3 A student bubbled chlorine gas into a test-tube containing aqueous potassium bromide. Describe the colour change seen in the test-tube. from to Complete the ionic equation for this reaction. Include state symbols. Cl 2+ Br –→ + When one mole of bromine, Br2, reacts with one mole of propene, one organic product is formed. Which part of the propene molecule reacts with bromine? What is the name of the type of reaction which takes place between bromine and propene? When one mole of chlorine, Cl 2, reacts with one mole of propane, a mixture of two structural isomers is formed. What is the name of the type of reaction which takes place between chlorine and propane? Explain what is meant by the term structural isomers. Draw the structure of two structural isomers formed when one mole of chlorine reacts with onemole of propane. Iodine forms an oxide which has the composition by mass: I, 76.0%; O, 24.0%. Use this information to determine the empirical formula of this oxide of iodine. empirical formula The oxide of iodine in dissolves in water. Predict and explain the effect of adding Universal Indicator to an aqueous solution of this oxide of iodine. effect on Universal Indicator explanation
0620_w16_qp_42
THEORY
2016
Paper 4, Variant 2
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The diagram shows the structures of five substances, A, B, C, D and E. A B D E C Br Br C H C H H H C H C Br Br H H H Na+ Br – Na+ Br – Na+ Br – Na+ Br – Br – Na+ Na+ Br – F F F Br Answer the following questions using only the structures in the diagram. Each structure may be used once, more than once or not at all. Which structure, A, B, C, D or E, is a diatomic molecule, contains ions, decolourises aqueous bromine, conducts electricity when molten, contains atoms of two different halogens? Bromine is an element. What is meant by the term element ? Bromine melts at –7 °C and boils at 59 °C. What is the physical state of bromine at –15 °C? Explain your answer.
0620_w17_qp_31
THEORY
2017
Paper 3, Variant 1
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The table shows the properties of some GroupVII elements. element boiling point in °C density at room temperature in g / cm3 physical state at room temperature fluorine –188 0.0017 chlorine 0.0032 gas bromine 3.1 liquid iodine 4.9 solid Use this information to: ● identify the physical state of fluorine at room temperature ● estimate the boiling point of chlorine.  Suggest why the density of chlorine is much lower than the densities of bromine and iodine. Chlorine is used in water treatment. Why is chlorine added to water? State one major use of water in industry. Chlorine reacts with phosphorus to form phosphorus(chloride. Balance the chemical equation for this reaction. P + Cl 2 2PCl 3  Complete the dot-and-cross diagram to show the electron arrangement in a molecule of chlorine. Show outer shell electrons only. Cl Cl  
0620_w18_qp_33
THEORY
2018
Paper 3, Variant 3
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Questions Discovered
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