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Edexcel Jun 2015 (IAL) Paper 1 Q22
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![Reject Reject H5 2 Reject H6 Reject H7 Mark Mark Mark Mark 2 OR H6 / 2 OR H6 2 OR 0.5 H6 Question Number 22(a)(iv) H1 Acceptable Answers ALLOW H1 =Acceptable Answers Question Number 22(a)(i) H2 ALLOW H2 =Acceptable Answers ALLOW H5 =Acceptable Answers Question Number 22(a)(ii) H5 Question Number 22(a)(iii) H6<br />
Acceptable Answers Reject Question Number 22(b)(i) Mark (The energy change / enthalpy change that accompanies / energy released / enthalpy released) the formation of one mole of a(n ionic) compound (1) ALLOW as alternative for compound: lattice /crystal / substance / solid / product from its gaseous ions Energy / enthalpy required / used molecule no 1st mark gaseous atoms no 2nd mark (1) NOTE one mole of gaseous ions scores max (1) (ie 2nd mark only available) IGNORE References to constituent elements References to standard conditions ALTERNATIVE RESPONSE If no mark(s) already awarded from above, can answer by giving:- energy change / enthalpy change per mole (1) Sr2+(g) + 2Cl(g)SrCl2(s) ALLOW Any correct generic equation with state symbols included (1)<br />
line IF answer = 2153 (kJ mol1) then award (2) marks, with or without working] 1st Mark: H1 = H2 + H3 + H4 + H5 + H6 + H7 OR H7 = H1[H2 + H3 + H4 + H5 + H6] OR H7 = 829[164 + 550 + 1064 + (122 x 2) + (2 x 349)] (1) 2nd Mark: H7 = 2153 (kJ mol1) (1) NOTE: The following answers score (1) mark with or without working +2153 (kJ mol1) 2031 (kJ mol1) 2502 (kJ mol1) 2380 (kJ mol1) NO OTHER TEs are allowed on an incorrect expression involving H7 Acceptable Answers Question Number 22(b)(ii) [FIRST, check the answer on the answer Reject Mark<br />
Acceptable Answers Reject Mark (Lattice energy of MgF2 more exothermic than that of NaF because) 1st mark: Mg2+ is smaller (than Na+) ALLOW Magnesium / Mg is smaller (than sodium / Na) 2nd mark: Mg2+ higher charge / higher charge density (than Na+) ALLOW Any reference to Mg2+ and Na+ in answer for the 2nd mark, unless nuclear charge mentioned (1) (1) No 1st mark if only mention Mg atom or atomic radius Mg2+ higher nuclear charge 3rd mark: (So electrostatic forces of) attraction between ions stronger in MgF2 (than in NaF) ALLOW Stronger ionic bonds in MgF2 / stronger ionic bonding in MgF2 (1) OR reverse arguments (Total for Question 22 = 11 marks) Question Number 22*(c)<br />](https://learnah.org/wp-content/uploads/2018/08/June_2015_IAL_MS_-_Unit_1_Edexcel_Chemistry_A-level_22-0.jpg)
