8. The Periodic Table
A section of Chemistry, 0620
Listing 10 of 592 questions
The table below shows the properties of some halogens. halogen colour state at room temperature melting point / °C fl uorine yellow –220 chlorine light green gas bromine brownish-red liquid –7 iodine grey-black solid +114 What is the trend in the colour of the halogens down the Group? Predict the state of fl uorine at room temperature. Predict the melting point of chlorine. The reactivity of three different halogens was compared by reacting them with solutions of sodium halides. The results are shown in the table below. reaction mixture observations astatine + sodium iodide colour of reaction mixture remains unchanged bromine + sodium iodide mixture turns dark brown chlorine + sodium bromide mixture turns brownish-red Use the results in the table to suggest the order of reactivity of astatine, bromine, chlorine and iodine. most reactive least reactive Predict whether bromine will react with sodium chloride solution. Explain your answer. Chlorine reacts with excess cold dilute sodium hydroxide. The products of the reaction are sodium chloride, sodium chlorate(and water. The formula of sodium chlorate(is NaCl O. Complete the equation for this reaction. Cl 2 + NaOH → NaCl + NaCl O + Explain why chlorine is used in water purifi cation. Impure water contains particles of minerals and remains of dead plants and animals. One stage in water purifi cation is the removal of these particles by fi ltration. The diagram below shows a water fi lter. water in small particles of sand Explain how this water fi lter works.
0620_w12_qp_22
THEORY
2012
Paper 2, Variant 2
View
Describe the properties of chlorine, bromine and iodine. In your answer, include the trends in: ● their state, ● their colour, ● their reactivity. A molecule of chlorine can be written as Cl – Cl. Which one of the following words describes this molecule? Put a ring around the correct answer. diatomic giant ionic monatomic Draw the electronic structure of a fl uorine atom. The equation below describes the reaction of a halogen with a halide. Br2 + 2KI → I2 + 2KBr Write a word equation for this reaction.
0620_w14_qp_23
THEORY
2014
Paper 2, Variant 3
View
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
View
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
View
Questions Discovered
592