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Download ACTUAL AQA 2025 AQA AS CHEMISTRY PAPER 1 JUNE 2025 WORKED EXAM SOLUTIONS and more Exams Chemistry in PDF only on Docsity!
Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature AS CHEMISTRY Paper 1 Inorganic and Physical Chemistry | declare this is my own work. Tuesday 13 May 2025 Morning Time allowed: 1 hour 30 minutes Materials For this paper you must have: e the Periodic Table/Data Sheet, provided as an insert (enclosed) ¢ aruler with millimetre measurements Question Mark ¢ ascientific calculator, which you are expected to use where appropriate. For Examiner's Use 1 Instructions e Use black ink or black ball-point pen. Fill in the boxes at the top of this page. « Answer all questions. « You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. ¢ If you need extra space for your answer(s), use the lined pages at the end of 7 this book. Write the question number against your answer(s). ¢ All working must be shown. © Do all rough work in this book. Cross through any work you do not TOTAL want to be marked. @lal}a}elr Section B Information e The marks for questions are shown in brackets. ¢ The maximum mark for this paper is 80. Advice « You are advised to spend 65 minutes on Section A and 25 minutes on Section B. IU 5740 ~TA0A/1 4 IB/M/Jun25/G4002/V6 Section A Answer all questions in this section. This question is about the extraction of titanium. The first stage in the extraction of titanium is the formation of titanium(IV) chloride, TiCly TiOAs) + 2C(s) + 2Clx(g) > TICL(I) + 2CO(g) TiAy = 46+ 4(35°5) = (90 9] [o[4].[1} Calculate the percentage atom economy to form TiCl in this first stage of the extraction. = [2 marks] 7 otem eeynerus = mil mom oy dewud prod. * 100 wal. rar eal ~veactomts Tid, = 48+ Alia = go gol = ne % ine 2C = 2eL =24 a] wel 146 LOA> 2(35-5x2) = (42 9 eet - 79.67%. Percentage atom economy gos) BO+ 24 4 y42 = 246 slew\ [o[4]. Suggest one economic advantage of using a process with a high percentage atom economy. Hiah. Clay. eConem, aeons mere the veactints ane cornered into ied produck, vyeducing woske> ond dowinag colt on vow moaleriols ond dispetal. [1 mark] «IMM | for more resources tyrionpapers.com 02 IB/M/Jun25/7404/1 Do not write outside the box Do not write outside the There are no questions printed on this page box DO NOT WRITE/ON THIS PAGE ANSWER IN THE/SPACES PROVIDED oA for more resources tyrionpapers.com 04 IB/M/Jun25/7404/1 4 Do not write outside the This question is about the halogens and their compounds. bok [o[2].[1] Table 1 shows the boiling points of some halogens. Table 1 Halogen Boiling point / °C Fluorine -188 Chlorine -35 Bromine 59 Explain the trend in the boiling points of these halogens. The [2 marks] Dd hecery torgere and Or yet Go deuin the @ep. [o]2].[2] Chlorine is toxic but is added to drinking water. State why chlorine is added to drinking water. Explain why this is safe to do even though chlorine is toxic. e Why chlorine is | the Why this is safe [2 marks] Question 2 continues on the next page Turn over > “MAN for more resources tyrionpapers.com 05 IB/M/Jun25/7404/1 5 [7] A halide ion X- reduces concentrated sulfuric acid to hydrogen sulfide. Identify the halide ion. Give an equation for the reaction. Halide ion aL Equation [2 marks] QI + H,SO.+QHt > GI ths +4H, Some solid sodium halides react with concentrated sulfuric acid without any redox reaction taking place. Identify a sodium halide that behaves in this way. Give an equation for the reaction. State the role of the halide ion in this reaction. [3 marks] a a. Noh (4) aul W1S04 (2) = NaHso, ( Sod au Equation + Hoh Role of halide ion Brewshid-Leuny Boxe Turn over for the next question Do not write outside the box O ie Turn over > “MAMA for more resources tyrionpapers.com 07 IB/M/Jun25/7404/1 (o[3][2] [o]3]/[3] This question is about atomic structure and time of flight (TOF) mass spectrometry. Give the full electron configuration of a fluoride ion (F>). [1 mark] 2 2 G6 ls” 2s. Lp The Q** ion has electron configuration 1s? 2s? 2p® 3s? 3p® 3d® Lertrey = 2 Identity, 1 Gta 3 Netach Q=2+23 =29 [1 mark] sips: Give the meaning of the term relative atomic mass. [2 marks] v por with ove: toh Ans PMA Be ov Cronhen -12 allem [0] 3].[4] A TOF mass spectrometer is used to determine the relative atomic mass of a metal. Explain why the sample of the metal must be ionised before passing into the flight tube. Describe how the ion is detected. Describe how the abundance of each isotope is determined. [3 marks] Why sample must be ionised ISS a Lh PAY A t » LEM he Howionisdetected Tho usr bh; the har, : Quad How abundance is determined The SA 20 Ys. LTOUME wo nee 7 oll 0 I A for more resources tyrionpapers.com 8 IB/M/Jun25/7404/1 Do not write outside the box 10 Do not write outside the [0] 3].[7] These are the data for one of the isotopes in this analysis. DOK. Length of flight tube = 0.850 m Time of flight = 6.41 x 104s KE=7.59 x 10°J The kinetic energy of an ion is given by the equation KE = 5 mv KE = kinetic energy / J m= mass / kg v=speed/ms Calculate the mass, in g, of one ion of this isotope. [3 marks] = dirtenre @ 3 wae, ee = = O0°3SD - | 32xh\o Aime 6-4\% 107 —20 wr < 2 KE 2x. 5% «10 ~ sy V (1-33 x10) 2 = ¢-ey< Ww d 5 mar leg < 10° 4) = Gcl < V0 % -123 || — Mass B61 X10 g || 13 aU for more resources tyrionpapers.com 10 IB/M/Jun25/7404/1 10 11 Do not write outside the box This question is about the Group 2 metals Mg to Ba [o[4].[4| Strontium and calcium have the same metallic structure. Explain why strontium has a lower melting point than calcium. Stvenlinm hes mere The Ane the prvtie. nuclei de the fabere wn Abrenilaarn ole wrrale grt Asopirne Lon Ve Jono) . [0] 4].[2] The atomic radius increases down Group 2 from Mg to [2 marks] Give a reason for this trend. [1 mark] Mere elodrens down the qreup, 3% V [o[4].[3] Give an equation, including state symbols, for the reaction between barium and water. [1 mark] Bo + 24.0 —- BON. +4 S ) (oA a [0] 4].[4] Give an equation, including state symbols, for the process that occurs when the second ionisation energy of calcium is measured. [1 mark] oe (gy — a (Qt e [0[4].[5| Identify the Group 2 metal with the lowest second ionisation energy. [1 mark] Bodin CR wD 6) Turn over > ML for more resources tyrionpapers.com 11 IB/M/Jun25/7404/1 11 13 = 5 (a) iden ° HA amd. Nad . 1 are 2 swt 250 Pw a Cur asians) = g- OUST MA. My = Mow -2 = ied WrehA o- OID Relative molecular mass of H2A \ ie) & In [0] 5].[2] The uncertainty in the use of the burette in each titration is 0.15 cm? Calculate the percentage uncertainty in the use of the burette in titration 1. [1 mark] aS 4% jt lo-6S = 5. Sm 2-ar/. Percentage uncertainty [0[5].[3| Suggest one way to reduce the percentage uncertainty in each titration without changing the apparatus. Justify your answer. Suggestion UA Ww Sesvepr the [2 marks] Justification Lerveyar tre WR eA the AMM obs eh Te suace ntowunitive Dy Oo Amable Do not write outside the box —ppertanitors. 4, wohmne Turn over > ull WI for more resources tyrionpapers.com 3 41 IB/M/Jun25/7404/1 13 14 Do not write outside the [o|6|.{1] A student completes a series of test-tube reactions on two solutions, A and B. DOK. Each solution contains an unknown inorganic compound. Table 4 shows the observations in these reactions. Table 4 Solution A Solution B Test White precipitate Effervescence formed Add H2SO,(aq) Test 2 : oa iar ee Effervescence Add HNOs(aq) followed by AgNOs(aq) Test 3 Add NaOH(aq) and warm gently. No visible change | Red Himus turns Hold a piece of damp red litmus paper over the end of the test tube. Show how the observations can be used to identify the inorganic compound in Solution A and the inorganic compound in Solution B. Give ionic equations for the reactions that occur. [6 marks] SAR Text L- HoSO4— white pbk. swrpas{ateaatien oaie_ioanlabde ppt Oo dundhisattr, OF JA _Teat 3 = NoDW od Heak > ve cred Test oD ars = = ree — ese Sa, “SE EE Re. Gal B: oO a 14 IB/M/Jun25/7404/1 14 16 This question is about chemical equilibria. A mixture of hydrogen and iodine is allowed to reach equilibrium in a sealed container. H2(g) + IX(g) = 2HI(g) AH = +52 kJ mol" Figure 1 shows how the concentration of iodine changes with time. Figure 1 Concentration N HE, Ma , a flo] 0 0 Time [o]7].[4] Draw a line on Figure 1 to show how the concentration of hydrogen iodide changes with time. [2 marks] [2] State and explain the effect of increasing the temperature on the equilibrium yield of hydrogen iodide. Effect on yield —Yyuhd _innertorrr Explanation [3 marks] 3 wooed: jl theta Cam = +52 kT ieuk) Do not write outside the box lntHport in temp wh the Rg prtibar dou % te the Svinte ove leak _prvoditin Mere HI. ANU for more resources tyrionpapers.com 16 IB/M/Jun25/7404/1 16 17 Carbon dioxide can react with hydrogen to form methanol. CO(g) + 3H2(g) = CHsOH(g) + H20(g) 2.50 mol of CO2 are mixed with 6.00 mol of H2 in a sealed container with a volume of 4.60 dm? The mixture is left to reach equilibrium at a fixed temperature. At equilibrium, 1.30 mol of CO2 remain. [0] 7].[3| Give an expression for the equilibrium constant, Ke, for this reaction. Calculate a value for the equilibrium constant at this fixed temperature. Give the units of the equilibrium constant. Expression forK. = (cHap4)(H 10 emens chy Calculation i ah Q : eias= 2-5 ; A= 6 = $B vk Clap ) po = Owe! ao 0 am nem =<25—-1:3 /esyr~ Cow's = \-2 weal _ 13 weal (ceq= ig o-283 me “Pe - _ CHz] = 24 2o-se0 D253 3x1 L=3S 4-6 hae 4 eqn. = 6— dG (cuson] = (Has \-7— = 24 = 6-2%\ Hed= CH dW = 12 | Keo ~lo-261\ (0.283) (0-Saay Ke |.64 Units das om Do not write outside the box Turn over > ull 0 for more resources tyrionpapers.com 17 IB/M/Jun25/7404/1 17 19 Do not write outside the What is the percentage by mass of sodium in sodium sulfate(VI)? bok [1 mark] \ Ion Sa A 193 [=] wo B 22.3 [Le] GHA [es] ve oma 4 G x Ids D 365 [=] 14a Turn over for the next question Turn over > 19 IB/M/Jun25/7404/1 19 20 Do not write outside the [1] 4] Which diagram best shows the arrangement and the relative sizes of the ions in bok solid sodium chloride? [1 mark] C+) O) mE SB GR ol i) for more resources tyrionpapers.com 2 0 IB/M/Jun25/7404/1 20 
