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MARK SCHEME – A-LEVEL CHEMISTRY – 7405/1 – JUNE 2021 4 For example, in a question requiring 2 answers for 2 marks: Correct answers Incorrect answers (ie incorrect rather than neutral) Mark (2) Comment 1 0 1 1 1 1 They have not exceeded the maximum number of responses so there is no penalty. 1 2 0 They have exceeded the maximum number

IB/M/Jun21/7405/1. Do not write outside the . Answer . all. questions in the spaces provided. box . 0 1 . This question is about enthalpy changes for calcium chloride and magnesium chloride. 0 1 . 1 . State the meaning of the term enthalpy change. [1 mark] Figure 1. shows an incomplete Born–Haber cycle for the formation of calcium chloride ...

7405/1 Mark Scheme 2021 AQA A Level Chemistry Paper 1. View and download the 2021 AQA A Level Chemistry Paper 1 7405/1 Inorganic and Physical Chemistry answers. Question Paper code: JUN217405101 / IB/M/Jun21/E9.

7405/1 Paper 1 Inorganic and Physical Chemistry Mark scheme June 2021 Version : 1.0 Final * 216A 74051/MS * MARK SCHEME A -LEVE L CHEMISTRY 7405/1 JUNE 2021 2 Mark schemes are prepared by the Lead Assessment Writer and considered, together with the rel evant questions, by a panel of subject teachers. ...

7405/ Paper 1 Inorganic and Physical Chemistry Mark scheme June 2021. Version: 1 Final. 216A74051/MS. Mark schemes are prepared by the Lead Assessment Writer and considered, together with the relevant questions, by a panel of subject teachers.

JUN217405101 IB/M/Jun21/E 9 7405/ For Examiner’s Use. Question Mark 1 2 3 4 5 6 7 8 9. TOTAL. Time allowed: 2 hours Materials. For this paper y ou must have:

MARK SCHEME – A-level CHEMISTRY – 7405/1 – JUNE 2020 Question Answers Additional comments/Guidelines Mark M1 ΔfH = ΔaH (Sr) + 2ΔaH (Cl) + Δ1st IEH (Sr) + Δ2nd IEH (Sr) + 2ΔEAH (Cl) + ΔLEH (Sr) 1 Or – 828 = 164 + (2 x 121) + 548 + 1060 + (2 x ΔEAH) + (– 2112) 01.1 M2 2 x ΔEAH = – 730 1 M3 ΔEAH = – 365 (kJ mol–1) Allow ...

[1 mark] Figure 1 shows an incomplete Born–Haber cycle for the formation of calcium chloride. Figure 1. 0 1. 2 Complete Figure 1 by writing the formulas, including state symbols, of the appropriate species on each of the three blank lines. [3 marks] * 04 * Do not write outside the 0 1. 4 Magnesium chloride dissolves in water. box

*JUN217405101* IB/M/Jun21/E9 7405/1 For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 TOTAL Time allowed: 2 hours Materials

IB/M/Jun21/7405/1 Do not write outside the Answer all questions in the spaces provided. box 0 1 This question is about enthalpy changes for calcium chloride and magnesium chloride. 0 1 . 1 State the meaning of the term enthalpy change. [1 mark] Figure 1 shows an incomplete Born–Haber cycle for the formation of calcium chloride. Figure 1 0 1 . 2

01.1 MP1 is for evidence of determining the charge on the nucleus. = 3.52 MP2 is for evidence of determining either the number of protons OR the number of nucleons. OR MP3 is for determining number of neutrons. Charge = 4.39 × 107 × 8.02 × 10–26 3kg 3 (× 10–18 C) Number of protons = charge/1.6 × 10–19 (= 22) () / –1 1

IB/M/Jun21/7405/1. Do not write. outside the. Answer all questions in the spaces provided. box. 0 1 This question is about enthalpy changes for calcium chloride and. magnesium chloride. 0 1 . 1 State the meaning of the term enthalpy change. [1 mark] Figure 1 shows an incomplete Born–Haber cycle for the formation of calcium chloride. Figure 1

A-level CHEMISTRY Paper 3 2 *02* IB/M/Jun21/7405/3 Do not write outside the box Section A Answer all questions in this section. 0 1 This question is about ethanedioic acid (HOOCCOOH) and the ethanedioate ion (−OOCCOO−). 0 1 . 1 Ethanedioic acid reacts with propane-1,3-diol (HOCH2CH2CH2OH) to form a polyester.

0 1. 1 Complete the equation by drawing the structure of the other product of this reaction in the box. Name the type of compound shown by the formula RCOOK. Give one use for this type of compound. [3 marks] Type of compound. Use. 0 1. 2 The triester in coconut oil has a relative molecular mass, Mr = 638.

IB/M/Jun21/7405/3. Do not write outside the box0. 1. 4 Figure 1 . shows the 25.0 cm. 3. pipette used to measure the sodium ethanedioate solution . Figure 1 . On . Figure 1, draw the meniscus of the solution when the pipette is ready to transfer 25.0 cm. 3 . of the sodium ethanedioate solution. [1 mark] 0 1 . 5 . Potassium manganate(VII) is ...

IB/M/Jun21/7405/3. Do not write outside the box0. 1. 4 Figure 1 . shows the 25.0 cm. 3. pipette used to measure the sodium ethanedioate solution . Figure 1 . On . Figure 1, draw the meniscus of the solution when the pipette is ready to transfer 25.0 cm. 3 . of the sodium ethanedioate solution. [1 mark] 0 1 . 5 . Potassium manganate(VII) is ...

IB/M/Jun21/7405/2 Do not write outside the box . 0 1. 3 A 1.450 g sample of coconut oil is heated with 0.421 g of KOH in aqueous ethanol until all of the triester ishydrolysed . The mixture is cooled. The remaining KOH is neutralised by exactly 15.65 cm3 of 0.100 mol dm– 3 HCl Calculate the percentage by mass of the triester (M r =

Do not write outside the box 0 1**.** 4 Figure 1 shows the 25 cm 3 pipette used to measure the sodium ethanedioate solution. Figure 1. null. On Figure 1, draw the meniscus of the solution when the pipette is ready to transfer 25 cm 3 of the sodium ethanedioate solution. [1 mark] 0 1**.** 5 Potassium manganate(VII) is oxidising and harmful.

IB/M/Jun21/7405/3. Do not write outside the box0. 1. 4 Figure 1 . shows the 25.0 cm. 3. pipette used to measure the sodium ethanedioate solution . Figure 1 . On . Figure 1, draw the meniscus of the solution when the pipette is ready to transfer 25.0 cm. 3 . of the sodium ethanedioate solution. [1 mark] 0 1 . 5 . Potassium manganate(VII) is ...