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Edexcel Jun 2014 Paper 1 Q22
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![22 Nickel is an element in the d-block of the Periodic Table. (a) Complete the electronic configuration of a nickel atom using the s, p, d notation. (1) 1s2(b) A sample of nickel is made up of three isotopes. The percentage abundances are shown in the table below. Isotope Percentage abundance 58Ni 60Ni 62Ni 69.02 27.32 3.66 Calculate the relative atomic mass of nickel. Give your answer to two decimal places. (2) *P42970A01724* 17 Turn over<br />
(c) Nickel reacts with carbon monoxide, CO, to give the compound nickel carbonyl, Ni(CO)4. Ni(s) + 4CO(g) (cid:111) Ni(CO)4(g) (i) Calculate the volume of carbon monoxide, in dm3, measured at room temperature and pressure, that is required to react completely with 5.87 g of nickel. [Relative atomic mass: Ni = 58.7 Molar volume of a gas = 24 dm3 mol1 at room temperature and pressure.] (ii) Calculate the number of carbon monoxide molecules present in the volume of gas you have calculated in (c)(i). [The Avogadro constant, L = 6.02 (cid:113) 1023 mol1] (3) (1) 18 *P42970A01824*<br />
(d) Nickel(II) nitrate, Ni(NO3)2, can be made by several different methods. Method 1 Nickel(II) oxide, NiO, was reacted with dilute nitric acid according to the equation NiO(s) + 2HNO3(aq) (cid:111) Ni(NO3)2(aq) + H2O(l) (i) Calculate the volume of 2.00 mol dm3 dilute nitric acid, in cm3, that was required to exactly neutralize 1.494 g of nickel(II) oxide. Use the relative atomic masses: Ni = 58.7, O = 16.0 (3) Method 2 A volume of 25.0 cm3 of 2.00 mol dm3 nitric acid, HNO3, was transferred to a beaker. Solid nickel(II) carbonate, NiCO3, was added until it was in excess. (ii) Why was excess nickel(II) carbonate used? (1)(iii) Why must the beaker be much larger than the volume of acid used? (1)*P42970A01924* 19 Turn over<br />
(iv) Write a balanced equation for the reaction between nickel(II) carbonate and dilute nitric acid, including state symbols. *(v) For Method 2, describe the practical steps that you would take to obtain pure dry crystals of hydrated nickel(II) nitrate, Ni(NO3)2.6H2O, from a mixture of nickel(II) nitrate solution and unreacted solid nickel(II) carbonate. (2) (4)(Total for Question 22 = 18 marks) 20 *P42970A02024*<br />](https://learnah.org/wp-content/uploads/2018/08/l_smalljpgJune_2014_QP_-_Unit_1_Edexcel_Chemistry_A-level_22-0.jpg)
![Mark Mark Reject Acceptable Answers (1s2) 2s2 2p6 3s2 3p6 3d8 4s2 OR (1s2) 2s2 2p6 3s2 3p6 4s2 3d8 ALLOW capital S P D Allow subscripts (e.g. (1s2) 2s2 2p6 3s2 3p6 4s2 3d8) Acceptable Answers Reject 58.68 (as rounding error) (Ar for Ni) = (58 x 0.6902) + (60 x 0.2732) + (62 x 0.0366) or a correct fraction using percentages (1) (= 58.6928) [calculator value] = 58.69 (must be to 2 dp) (1) 2nd mark CQ on numbers transcribed Correct answer with no working (2) IGNORE Units of any kind (e.g. g, g mol1, amu, etc.) 6CH0101 1406 Question Number 22(a) Question Number 22(b)<br />
Acceptable Answers Question Number 22(c)(i) Moles of nickel = 5.87 58.7 = 0.1(00) (mol) (1) Moles CO = 0.1(00) x 4 = 0.4(00) (mol) Answer CQ on 4 x mol Ni Question Number 22(c)(ii) (1) Volume of CO = 0.4(00) x 24 (dm3) = 9.6 (dm3) ALLOW 9600 cm3 Answer CQ on 24 x mol CO (1) Correct answer with no working scores (3) Acceptable Answers (Number of CO molecules = 0.400 x 6.02 x 1023) = 2.408 x 1023 Answer CQ on moles / volume of CO in (c)(i) IGNORE sf except 1 sf IGNORE Any units, even if incorrect Mark Reject 9.6 dm3 mol-1 (no 3rd mark) 9.6 dm-3 (no 3rd mark) OR Any other incorrect units (no 3rd mark) Reject Mark 6CH0101 1406<br />
74.7 = 0.02(00) (mol) (1) Moles HNO3 = 0.02(00) x 2 = 0.04(00) (mol) Answer CQ on 2 x mol NiO (1) Volume of HNO3 = 0.04(00) x 1000 2.00 = 20(.0) (cm3) ALLOW 0.02(00) dm3 Answer CQ on mol HNO3 (1) Correct answer with no working scores (3) Penalise wrong units ONCE only Question Number 22(d)(ii) To ensure all the acid reacts / all the Acceptable Answers acid is used up / all the acid is neutralized IGNORE References to yield / reaction going to completion / just acid is the limiting reagent Reject To ensure all the reactants are used up Question Number 22(d)(i) Moles of NiO = 1.494 Acceptable Answers Reject Mark Mark Mark Question Number 22(d)(iii) Acceptable Answers Reject Fizzing / effervescence / frothing / bubbles / gas released IGNORE spilling (over) / spillage References to vigorous, exothermic, violent / just safety (Mixture) boils Quantity of reagents / displacement of solution on adding solid 6CH0101 1406<br />
Acceptable Answers Reject Mark Question Number 22(d) (iv) NiCO3(s) + 2HNO3(aq)Ni(NO3)2(aq) + H2O(l) +CO2(g) ALLOW correct ionic equation NiCO3(s) + 2H+(aq)Ni2+(aq) + H2O(l) +CO2(g) All species correct Balancing and all state symbols correct 2nd mark is dependent on 1st mark (ie all species correct) (1) (1) H2CO3(aq) scores (0) overall 6CH0101 1406<br />
Acceptable Answers Question Number *22(d)(v) First mark: Mark Reject Just warm the filtrate / solution OR heat the filtrate to dryness (Adding to a) drying agent Use of Bunsen burner or direct heating to dry crystals Filter (off the excess nickel(II) carbonate / solid) (1) Second mark: Boil / heat (to drive off some of the water) (1) IGNORE just evaporation (as the technique of boiling / heating is required here) Third mark: Leave to cool / leave to crystallize / evaporate (water) slowly / leave (for water) to evaporate (1) Fourth mark: Dry (the crystals) (1) IGNORE Any washing of the crystals immediately prior to drying them NOTE If heat to dryness in the second stage, award (1) mark if filtration is first stage If filtration is not the first stage, award (1) mark for steps 2, 3 and 4 all correct (Total for Question 22 = 18 marks) 6CH0101 1406<br />](https://learnah.org/wp-content/uploads/2018/08/June_2014_MS_-_Unit_1_Edexcel_Chemistry_A-level_22-0.jpg)
