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5070 s10 ms 22 100%
• thermal conductor / • electrical conductor / • soft or cuts easily / • low melting point or low boiling point / • (relatively) low density or lightweight IGNORE:
Ignore “[...] or by adding or subtracting ranks [...]” in the second paragraph.
Jun 14 MS 92%
Not 1.67 × 10–24 (g) kg 1(a)(ii) Comments 1 OR ratio 10:11 = 1:4 OR 20:80 etc 1 Allow idea that there are 5 × 0.2 divisions between 10 and 11 abundance of 10B is 20(%) 1 Correct answer scores M1 and M2 1 Ignore electrons determine chemical properties.
Jan 11 MS 91%
Foundation Chemistry – January 2011 Question Marking Guidance Mark 1(a) Water or H2O or molecules (in ice) are held further apart (than in liquid water)/(more) space/gaps/holes in structure/ Water or H2O or molecules (in ice) are more spread out 1 Comments Allow water (liquid) is more compact / less space/gaps/holes CE if holes filled with air, O2 etc CE if macromolecule CE if atoms further apart (since ambiguous) Ignore spaces filled with H2O Ignore reference to H bonds Allow better tessellation in liquid water 1(b)(i) Hydrogen bonding 1 Allow H bonds Do not allow „hydrogen‟ only but mark on 1(b)(ii) Van der Waals‟ / VdW 1 Allow London forces, dispersion forces, temporary induced dipole forces 1(b)(iii) Hydrogen bonding is stronger (than van der Waals forces) / IMF in ice stronger (than IMF in methane)/ H bonds take more energy to break 1 Not H Bonds are strong (needs comparison) If (b)(i) OR (ii) is incorrect, cannot award (b)(iii) If (b)(i) and /or (ii) is blank, can score (b)(iii) 3 Mark Scheme – General Certificate of Education (A-level) Chemistry – Unit 1:
Jun 15 MS 91%
MARK SCHEME – A-LEVEL CHEMISTRY – CHEM1 – JUNE 2015 Question 1(a) 1(b) Marking Guidance Mark Comments Silicon / Si 1 If not silicon then CE = 0/3 covalent (bonds) 1 M3 dependent on correct M2 Strong or many of the (covalent) bonds need to be broken / needs a lot of energy to break the (covalent) bonds 1 Ignore hard to break Argon / Ar 1 If not argon then CE = 0/3.
Jan 13 MS 91%
Foundation Chemistry – January 2013 Question Marking Guidance Mark Comments 1(a) (Total number of) protons and neutrons (in nucleus of atom) 1 (number of) nucleons 1(b) Zn 1 Do not allow Zn-1 or Zn+1 or ZN Ignore numbers P = ionise (sample) 1 Allow removing an electron / forms (+) ions Q = accelerate (sample) 1 Allow speeds (ions) up Penalise molecules / atoms m/z 1 Allow mass / charge (relative) abundance / (relative) intensity 1 QoL Allow M1 + M2 in any order 206 + 207 + (208 x 2) = (829) 4 4 1 1 M1 = topline M2 = ÷ 4 = 207.3 1 Only 207.3 = 3 marks 1(d)(ii) Lead/Pb 1 Not PB 1(d)(iii) Same number of electrons (in outer shell) / same electronic configuration 1 Ignore electrons determine chemical properties Ignore reference to p and n if correct Penalise if incorrect 1(c)(i) 1(c)(ii) 1(d)(i) 3 Mark Scheme – General Certificate of Education (A-level) Chemistry – Unit 1:
command terminate Page 74 UNIX SYSTEM PROGRAMMING SIGUSR1 user-defined signal terminate SIGUSR2 user-defined signal terminate 10CS62 SIGCHLD change in status of child ignore SIGCONT continue stopped process continue/ignore SIGSTOP stop a process execution stop process SIGTTIN stop a background process when it read from its control tty stop process SIGTSTP stop a process execution by the ctrl-z key stop process SIGTTOU stop a background process when it writes to its control stop process tt y 8.
DONEZO MANIFESTO Bernkastel Contents Communication with third party developers?
Research by Capaldi has found that this holds true. Models that ignore reciprocal IPV can inhibit violent women from receiving the support they need to stop their violence. White Ribbon Australia completely ignores reciprocal IPV as it advances a gendered narrative.
5090 s13 ms 22 88%
© Cambridge International Examinations 2013 Max 3 Ignore mitochondrion / ribosome Page 3 (c) Mark Scheme GCE O LEVEL – May/June 2013 Syllabus 5090 Correct ref.
© OCR 2015 2 B742/02 Annotations Final Mark Scheme Annotation Meaning correct response incorrect response benefit of the doubt benefit of the doubt not given error carried forward information omitted ignore reject contradiction Level 1 Level 2 Level 3 3 June 2015 B742/02 Final Mark Scheme June 2015 ADDITIONAL OBJECTS:
5070 s12 ms 21 88%
8] A3 (a) No free electrons / no delocalised electrons / no sea of electrons / all electrons are in covalent bonds / electrons cannot move (1) (b) Molecules gain (kinetic) energy (1) Allow particles move faster Not atoms gain energy Overcome intermolecular forces / break attraction between molecules (1) Ignore weak forces between particles Not break covalent bonds © University of Cambridge International Examinations 2012   Page 3 (c) Mark Scheme: