# Complete the table to show the relative charge of each particle and the number of each particle found in a 140 Ce 2+ ion.

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1 1 This question is about the elements with atomic numbers between 58 and 70 (a) Cerium, atomic number 58, is a metal Complete the table to show the relative charge of each particle and the number of each particle found in a 140 Ce 2+ ion Particle proton neutron Relative charge of each particle Number of each particle present in a 140 Ce 2+ ion electron [2] (b) Cerium behaves as a typical metal when it reacts with dilute sulfuric acid to form the salt cerium(iii) sulfate and a second product Identify the second product (ii) Write the formula of cerium(iii) sulfate and, explain what has happened to the cerium in this reaction in terms of the number of electrons transferred Formula Explanation [2] (iii) How has a salt been formed in this reaction?

2 (c) Europium, atomic number 63, reacts with oxygen at room temperature 4Eu + 3O 2 2Eu 2 O 3 Calculate the volume of oxygen, in cm 3, required to fully react with 912 g of europium at room temperature and pressure Volume = cm 3 [2] (d) A compound of thulium, atomic number 69, has the following composition by mass: O 307% S 154% Tm 539% State what is meant by the term empirical formula (ii) Determine the empirical formula of the compound Show your working Empirical formula = [2]

3 (e) Ytterbium, atomic number 70, is the first element in the Periodic Table to have the first four shells full State the number of electrons in the fourth shell of ytterbium [1] (ii) How many orbitals are there in the third shell of ytterbium? [1] [Total: 13]

4 2 This question is about Group 7 elements (a) Chlorine can be made by the redox reaction below MnO 2 (s) + 4HCl(aq) MnCl 2 (aq) + 2H 2 O(l) + Cl 2 (g) Using oxidation numbers, show what has been oxidised and what has been reduced in this reaction Oxidised Reduced [2] (b) Complete the electron configuration of a manganese atom 1s 2 (c) Chlorine gas can be added to a cold, dilute alkaline solution to form bleach Write the equation for this reaction [1] (d) A student bubbles chlorine gas through aqueous potassium iodide A reaction takes place State what the student would observe (ii) Write the ionic equation for this reaction Include state symbols

5 (e) Chlorine gas reacts with methane One of the products is dichloromethane, CH 2 Cl 2 Chlorine is more electronegative than carbon and hydrogen, which have approximately equal electronegativity values Explain what is meant by the term electronegativity [2] (ii) Draw a 3-D diagram of a molecule of CH 2 Cl 2 Use partial charges to indicate polar bonds [2] (iii) Explain why a CH 2 Cl 2 molecule is polar (f) Bromine has two isotopes, Br 79 and Br 81 The relative atomic mass of bromine is 799 Calculate the percentage of Br 79 atoms in a sample of bromine Answer = % [1] [Total: 12]

6 3 A student was given 200 cm 3 of solution X in which sodium hydroxide, NaOH, and sodium hydrogencarbonate, NaHCO 3, had both been dissolved The student carried out two different titrations on samples of solution X using 0100 mol dm 3 sulfuric acid, H 2 In the first titration, both NaOH and NaHCO 3 were neutralised In the second titration, only NaOH was neutralised The student s results for the titrations of 250 cm 3 samples of solution X are shown volume of H 2 needed to neutralise both NaOH and NaHCO cm 3 volume of H 2 needed to neutralise only NaOH 1800 cm 3 2NaOH(aq) + H 2 (aq) 2NaHCO 3 (aq) + H 2 (aq) Na 2 (aq) + 2H 2 O(l) Na 2 (aq) + 2H 2 O(l) + 2CO 2 (g) (a) Calculate the amount, in mol, of H 2 used to neutralise only the NaOH in 250 cm 3 of solution X Amount = mol [1] (ii) Calculate the concentration, in mol dm 3, of NaOH in solution X Concentration = mol dm 3 [1]

7 (b) Calculate the amount, in mol, of NaHCO 3 in the 200 cm 3 of solution X 11 (ii) Calculate the mass of NaHCO 3 in the 200 cm 3 of solution X Give your answer to three significant figures Amount = mol [2] Mass = g [1] [Total: 5]

8 4 Calcium is in Group 2 of the Periodic Table The diagram shows some reactions of calcium and its compounds Calcium Calcium carbonate Reaction 1 Reaction 2 Calcium oxide Calcium hydroxide (a) Reactions 1 and 2 both form calcium oxide Write the equation for reaction 1 (ii) What type of reaction is reaction 2? (b) Calcium hydroxide is both a base and an alkali Refer to any relevant ions in your answer Explain what is meant by the terms base and alkali Base Alkali [2]

9 (c) A student prepared some calcium hydroxide by adding a small piece of calcium to a large excess of water Describe what the student would observe and write the equation for the reaction Observation Equation [2] (d) A student prepares a solution of calcium nitrate from calcium carbonate What reagent would the student need to use? Write the equation for the reaction Reagent Equation [2] [Total: 8]

10 5 Antimony, Sb, has atomic number 51 (a) Complete the table below to show where antimony is found in the Periodic Table Period Block [1] (b) Antimony exists as a mixture of isotopes What is meant by the term isotopes? (ii) Different isotopes of antimony have the same chemical properties Explain why (iii) Complete the table below to show the atomic structure of 121 Sb Protons Neutrons Electrons [1] (c) The relative atomic mass of antimony is 1218 Define the term relative atomic mass [3]

11 (ii) A sample of antimony, A r = 1218, was analysed and was found to consist of 60% 121 Sb and one other isotope Determine the mass number of the other isotope in the sample of antimony mass number of the other antimony isotope = [1] (d) Antimony chloride, SbCl 3, exists as simple covalent molecules A dot-and-cross diagram of SbCl 3 is shown below Cl Sb Cl Cl Predict the shape of a molecule of SbCl 3 Explain your answer name of shape: explanation: [3] (ii) SbCl 3 molecules are polar Explain why [2] [Total: 13]

12 6 This question is about compounds used in fertilisers (a) A compound used as a fertiliser has the following composition by mass: C, 2000%; H, 667%; N, 4667%; O, 2666% Calculate the empirical formula of this compound empirical formula = [2] (b) A salt used as a fertiliser has the empirical formula H 4 N 2 O 3 Suggest the formulae of the ions present in this salt [2] (c) Calcium phosphate(v), Ca 3 (PO 4 ) 2, is another salt used in fertilisers Calcium phosphate(v) can be prepared by reacting together an acid and a base Suggest the formula of the acid used to prepare Ca 3 (PO 4 ) 2 (ii) Name a base which could be used to prepare Ca 3 (PO 4 ) 2 [Total: 6]

13 7 An aqueous solution of aluminium chloride can be prepared by the redox reaction between aluminium metal and dilute hydrochloric acid A student reacts mol of aluminium completely with dilute hydrochloric acid to form an aqueous solution of aluminium chloride The equation for this reaction is shown below 2Al(s) + 6HCl(aq) 2Al Cl 3 (aq) + 3H 2 (g) (a) In terms of electron transfer, explain whether aluminium is being oxidised or reduced [1] (b) Calculate the volume of hydrogen gas formed, in dm 3, at room temperature and pressure volume of hydrogen gas formed = dm 3 [2] (c) Calculate the mass of Al Cl 3 formed Give your answer to three significant figures mass of Al Cl 3 formed = g [2] (d) Calculate the volume, in cm 3, of 120 mol dm 3 hydrochloric acid needed to react completely with mol of aluminium volume = cm 3 [2] [Total: 7]

14 8 Silicon and potassium are two elements found in the Earth s crust (a) Silicon and potassium both exist as several isotopes Define the term relative isotopic mass [2] (ii) Complete the table below for an atom and an ion of two different isotopes of potassium Protons Neutrons Electrons 39 K [2] (b) Complete the electron configuration of a silicon atom 1s 2 (c) Silicon reacts with chlorine to form molecules of silicon tetrachloride, SiCl 4 How many molecules are present in 8505 g of SiCl 4? answer = molecules [3]

15 (ii) Potassium reacts with chlorine to form an ionic lattice of potassium chloride, KCl A diagram of part of the potassium chloride lattice is shown below Add labels to each circle in the diagram to show the particles present in the lattice The diagram assumes all particles have the same size [2] [Total: 10]

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