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Edexcel Jun 2014 Paper 1 Q23
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![Acceptable Answers (Protons) (Electrons) (Neutrons) 18 18 22 All three numbers correct for the mark Reject Acceptable Answers Reject (Position in the Periodic Table) depends upon atomic number / proton number OR Ar (atom) has (one) fewer proton(s) (than K atom) OR K (atom) has (one) more proton(s) (than Ar atom) OR K has atomic number 19 (whereas) Ar has atomic number 18 OR Ar has 18 protons, K has 19 protons IGNORE Elements are not arranged in order of (relative) atomic mass IGNORE Mention of numbers of electrons / numbers of shells (of electrons) IGNORE Arranged in vertical groups in accordance to properties / Argon is a noble gas Question Number 23(a) Question Number 23(b) Mark Mark 6CH0101 1406<br />
Acceptable Answers Reject Reject First mark Property / trend / pattern ALLOW Any named property (e.g. atomic radius, ionization energy, melting temperature) (1) Second mark Repeated (across each period) OR Regular (across each period) OR Re-occurring (across each period) (1) NOTE Statement such as: A repeating trend across a period / across each period scores (2) Acceptable Answers Phosphorus / P / P4 OR Sulfur / S / S8 OR Chlorine / Cl / Cl2 IGNORE Argon / Ar Question Number 23(c) Question Number 23(d)(i) Mark Mark 6CH0101 1406<br />
Question Number 23(d)(ii) (The covalent) bonds are strong Acceptable Answers (throughout the lattice) (1) (therefore) a lot of energy is required to break the bonds / a lot of energy is needed to overcome the attractions (between atoms) / more energy is required to break the bonds /more energy is needed to overcome the attractions (between atoms) / greater amount of energy is required to break the bonds /greater amount of energy is needed to overcome the attractions (between atoms) (1) Mark Reject MENTION OF ANY OF THE FOLLOWING SCORES (0) OVERALL (simple) molecular silicon (0) molecules of silicon (0) silicon has ions / silicon is ionic (0) intermolecular forces / van der Waals forces / London forces / forces between the molecules (0) metallic bonding (0) 6CH0101 1406<br />
Question Number 23(d)(iii) ALLOW reverse arguments in each Acceptable Answers case Any two from four:- magnesium ions / magnesium atoms are smaller (than sodium ions / sodium atoms) (1) NOTE: Allow symbols (e.g. Mg or Mg2+ ) magnesium ions are Mg2+ whereas sodium ions are Na+ OR Mg2+ / magnesium ions have a larger charge (density) (than Na+ /sodium ions) (1) [NOTE: It follows that the statement that Mg2+ ions are smaller than Na+ ions would score the first two scoring points above] magnesium has more delocalised electrons (than sodium) (1) IGNORE free electrons IGNORE just sea of electrons magnesium is close-packed (but sodium is not close-packed) (1) Third mark (stand-alone):more / a lot of (heat) energy is needed to break (metallic) bonds in Mg (than in Na) ORattraction between the positive ions and (delocalised) electrons is stronger in magnesium (than in sodium) (1) Mark Reject attraction between nucleus and (delocalised) electrons (no third mark) mention of intermolecular forces / molecules (no third mark) 6CH0101 1406<br />
IGNORE Just metallic bonding in Mg stronger than that in Na ionic bonding (no third mark) attraction between Mg2+ ions (no third mark) NOTE: arguments based on ionization energies scores (0) overall OR any suggestion of removal of outer shell electrons as part of the melting process scores (0) overall (Total for Question 23 = 10 marks) TOTAL FOR SECTION B = 60 marks TOTAL FOR PAPER = 80 marks 6CH0101 1406<br />](https://learnah.org/wp-content/uploads/2018/08/June_2014_MS_-_Unit_1_Edexcel_Chemistry_A-level_23-0.jpg)
