Mark Scheme (Results) Summer International GCSE. Edexcel Level 1/Level 2 Certificate
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1 Mark Scheme (Results) Summer 202 International GCSE Chemistry (4CH0) Paper C Science Double Award (4SC0) Paper C Edexcel Level /Level 2 Certificate Chemistry (KCH0) Paper C Science (Double Award) (KSC0) Paper C
2 Edexcel and BTEC Qualifications Edexcel and BTEC qualifications come from Pearson, the world s leading learning company. We provide a wide range of qualifications including academic, vocational, occupational and specific programmes for employers. For further information, please visit our website at Our website subject pages hold useful resources, support material and live feeds from our subject advisors giving you access to a portal of information. If you have any subject specific questions about this specification that require the help of a subject specialist, you may find our Ask The Expert service helpful. Pearson: helping people progress, everywhere Our aim is to help everyone progress in their lives through education. We believe in every kind of learning, for all kinds of people, wherever they are in the world. We ve been involved in education for over 50 years, and by working across 70 countries, in 00 languages, we have built an international reputation for our commitment to high standards and raising achievement through innovation in education. Find out more about how we can help you and your students at: Summer 202 Publications Code UG03876 All the material in this publication is copyright Pearson Education Ltd 202
3 INTERNATIONAL GCSE CHEMISTY PAPER C SUMMER 202 Question (a) Or 2D diagram measuring cylinder (top pan) balance /scale(s) / weighing machine B C Ignore D A or E Ignore extra apparatus on top of tripod eg beaker Minimum is 2 vertical or diagonal lines with something on top 6 mark for each correct answer
4 (b) M wear (safety) glasses / spectacles / goggles / eye protection It M2 salt /solution / water may spit out (when evaporating the salty water) / may get in your eye IGNE references to hazards eg toxic / irritant M use (beaker) tongs / hot hand / (rigger/oven) glove(s) (to remove / lift the basin) M2 basin will / may be hot M tie hair back / tuck in tie M2 might catch fire (in Bunsen burner) leave basin (to cool) before removing to avoid burning hand crucible tongs / plastic gloves the reason must match the precaution IGNE references to wearing lab. coats / protective clothing (c) (2.9 x 2) = 5.8 (g)
5 2 (a) (i) (ii) M calcium M2 magnesium Ca Mg any other answers iron / zinc Fe / Zn any other answers (iii) calcium magnesium zinc iron copper Ca Mg Zn Fe Cu 3 M for calcium as most reactive M2 for copper as least reactive M3 for remainder in correct order (b) (i) hydrogen / H 2 H (ii) all the (sulfuric) acid has reacted /all hydrogen (ions) have been replaced (by magnesium (ions)) acid has been used up/been neutralised / acid has run out sulphuric for sulfuric hydrogen ions / H + for acid all the magnesium / reactants used up IGNE the acid is saturated / excess magnesium has been added (iii) magnesium sulfate (solution) IGNE incorrect formula sulphate for sulfate MgSO 4 (iv) filtration / filter (it / magnesium / solution) / decantation / decant (off the water / solution) description of filtration sieve crystallisation IGNE references to distillation / centrifuging / washing / evaporation after filtration
6 2 (c) (i) exothermic (ii) magnesium oxide IGNE incorrect formula MgO
7 3 (a) M precipitate of barium sulfate sulphate for sulfate insoluble barium sulphate / BaSO 4 incorrect name of ppt. M2 no precipitate M3 precipitate of calcium sulfate IGNE colours penalise incorrect extra observations (e.g. effervescence) ONCE only For M and M3 only: if only precipitate appears twice (with no names), penalise missing names once only if only names correct (with no precipitates), penalise omission of precipitate once only no (visible) change solution (formed) sulphate for sulfate insoluble calcium sulfate / CaSO 4 incorrect name of ppt.
8 3 (b) aq aq s aq (c) (i) obtain the lead(ii) bromide/the residue/the solid remove the liquid/solution/potassium nitrate/water separate the solid and liquid (ii) to wash away/remove the (remaining) potassium nitrate / lead(ii) nitrate / potassium bromide / solution IGNE clean wash away / remove (remaining soluble) impurities to make it pure make the mixture pure (iii) distilled water is pure / does not contain (dissolved) impurities / ions / substances / compounds / other chemicals (that would contaminate the lead(ii) bromide) / residue / solid) reverse argument for tap water any suggestion that the water / impurities react IGNE elements IGNE references to distilled water being cleaner (A) (iv) to evaporate the water / to dry (the solid/crystals) / increase rate of evaporation (of water) IGNE liquid to avoid decomposition (if heated strongly) to evaporate the potassium nitrate / solution any reference to crystallisation
9 4 (a) (increasing) atomic (s) proton / of protons mass / RAM IGNE references to electrons / electronic configurations (b) (i) sodium / potassium Na / K (ii) fluorine / chlorine / bromine F / Cl / Br / F 2 / Cl 2 / Br 2 fluoride / chloride / bromide (c) (i) sodium potassium Na / K AND fluorine chlorine bromine hydrogen Answers can be in either order IGNE incorrect symbols/formulae if names are correct (ii) Marks do not have to be CQ on (c)(i), and all marks can be scored here for correct diagrams of the ions in a hydrogen halide M Na or K with 8 electrons M2 F, Cl or Br with 8 electrons IGNE diagrams showing initial electron configurations F / Cl / Br / H / F 2 / Cl 2 / Br 2 / H 2 0 electrons H with 2 electrons fluoride / chloride / bromide / hydride Incorrect electron transfer for M and M2 M3 ()+ AND () charges correct IGNE inner shells even if incorrect
10 Allow any combination of dots and crosses If shown covalently bonded, then max. for correct charges if given If the position of 2 electrons shown between the two species makes it hard to be sure that the bonding is definitely ionic (and not covalent), do not award M or M2
11 4 (d) (fluorine reacts) vigorously / instantly / explosively / violently / very quickly / very rapidly IGNE references to electron transfer, even if incorrect the quickest / more quickly than chlorine fluorine reaction slower than chlorine reaction (to form) iron(iii) fluoride ferric fluoride / FeF 3 (e) M colourless (IGNE clear) no colour decolourised M2 orange / yellow /brown IGNE qualifiers such as light / dark any combination of colours on left any other colour
12 5 (a) 2H 2 O 2 2H 2 O + O 2 H 2 O 2 H 2 O + ½O 2 2 multiples M all formulae correct (including catalyst if given) M2 correct balancing M2 DEP on M If catalyst included in equation, must be MnO 2 on both sides IGNE MnO 2 above the arrow (b) relights a glowing spill IGNE reference to popping splint for spill smouldering/embering for glowing (c) M (rate) increases speeds up / goes faster / decreases time (for decomposition) M2 provides an alternative pathway / route / mechanism (for the reaction) hydrogen peroxide) particles / molecules / reactant(s) adsorb (onto catalyst) M3 with a lower activation energy more particles / molecules have the (required) activation energy weakens the (covalent) bonds (in the hydrogen peroxide) lowers the activation energy by going a different way = M2 and M3 Absorb / sticks to / bonds to /provides a surface for particles /molecules / reactant(s) to react description of activation energy eg particles have enough energy to react gives particles more kinetic energy for M2 and M3 atoms atoms
13 5 (d) (i) M curve starting at origin and below original curve M2 levelling off at 30 cm 3 (+/- 0.5) and anywhere between 30s and 20s (ii) M curve starting at origin and above original curve M2 levelling off at 60 cm 3 (+/- 0.5) and before 80s if curves incorrectly labelled then penalise each curve mark, so max. 2 for the question curve reaching right vertical axis below 30cm 3 but still going up both curves unlabelled
14 Expected Answer Accept Reject 6 (a) M both protons = 6 Ma rks M2 C-3 has 7 and C-4 has 8 (neutrons) (b) same electronic configuration(s) / structure(s) different of protons same of electrons amount for / six electrons have four/same of electrons in outer / valence shell IGNE same of electrons in inner shells IGNE references to atomic / same of protons / different of neutrons (c) (i) M the average / mean mass of an atom (of the element) average/mean of: atomic masses / mass s / mass of isotopes mean mass of an element M2 compared to / relative to (/2 th ) the mass (of an atom) of carbon-2 on a scale where carbon-2 has a mass of 2 / compared with the mass of carbon-2 which is 2 M mass of one mole of atoms M2 compared to (mass of) /2 th one mole / g of carbon-2 mass of one mole of the element
15 6 c (ii) M (2 x 98.9) + (3 x.) M2 00 Expected Answer Accept Reject (2 x 0.989) + (3 x 0.0) for first 2 marks Mar ks M3 2.0 IGNE units 2.0 on its own for 2 marks 2.0 on its own for 3 marks
16 7 (a) (i) M contains carbon and hydrogen (atoms / elements / particles) C and H for carbon and hydrogen ions / carbon molecules / hydrogen molecules / H 2 / mixture of C and H M2 only other equivalent words, eg solely / entirely / completely M2 DEP on M, but allow M2 if molecules / ions / mixture used in M (ii) C 0 H 22 H 22 C 0 Reject superscripts / IGNE structural formula lower case c or h / full size s (b) (i) addition additional (ii) M one of the bonds in the double bond breaks M2 (many) ethene(s)/molecules/monomers join (together) (many) ethene(s)/molecules/monomers form a chain double bond breaks / double bond becomes single bond changes (from unsaturated) to saturated
17 7 (c) Any 4 from: produces smaller / shorter (chain) molecules smaller / shorter (chain) molecules more useful (as fuels) / have greater demand smaller / shorter (chain) molecules burn more cleanly /are used to make petrol/diesel/fuel for vehicles crude oil richer in / has a surplus of long (chain) molecules A low(er) demand products converted to high(er) demand products A produces alkenes / any named alkene alkenes used to make alcohol / polymers / plastics / chemical feedstock / any named addition polymer 4
18 8 (a) (i) diffusion (ii) ammonia because it moves further (in the same time) / ammonia moved 60cm and hydrogen chloride moved 40cm ammonia because (white) ring right of centre / ring is further from ammonia end / closer to HCl end Do not penalise atoms in place of molecules/ particles (b) M less than 5 mins / less time (for white ring to form) reverse arguments ammonia has lower density / has lighter molecules / smaller M r references to solutions IGNE smaller molecules (forms more) quickly / sooner M2 particles / molecules have more (kinetic) energy gas has more energy M3 and particles/gas move(s) / diffuse faster IGNE references to rate of reaction / more (successful/frequent) collisions Do not penalise atoms in place of molecules/particles
19 8 (c) particles/molecules collide with air particles/molecules in air particles / molecules collide with one another / the wall (of the tube) Do not penalise collisions between ammonia and hydrogen chloride particles move in random direction / need many collisions (for white ring) to become visible / many particles of ammonium chloride must form (before white ring seen) Do not penalise atoms in place of molecules/ particles IGNE references to time taken for evaporation to take place IGNE references to time taken for reaction to take place
20 9 (a) silicon dioxide is acidic an acid calcium oxide is basic / a base calcium oxide is alkaline / an alkali If neither mark scored, award mark for: reaction is neutralisation reaction is between an acid and a base/alkali (even if wrongly identified)
21 9 (b) (i) M oxygen (atom) M2 forms two bonds / smaller atom / has valency of 2 IGNE more (oxygen) in the formula more of them (n the diagram / structure) oxygen molecule / O 2 / oxide ion /oxygen ion M2 DEP on M, although allow M2 if oxygen mentioned but M not awarded because of reference to molecule/ion/o 2 (ii) M giant (structure / lattice / atomic) IGNE large / 3D giant molecular / macromolecular M2 covalent M3 idea that covalent bonds are broken IGNE bonds are loosened overcome for broken M4 covalent bonds are strong / lots of energy required to break covalent bonds/ lots of heat required to break covalent bonds many bonds are broken = M3 + M4 IGNE high temperature needed Do not penalise silicone Max2 for mention of ionic or metallic bonding or intermolecular forces Max 3 if discussing diamond / carbon
22 0 (a) (i) M Na (.5 23) = 0.05 (mol) O (0.80 6) = 0.05 (mol) Accept correct alternative working M2 ratio : M2 DEP on M (moles are) the same/equal division by atomic s division upside down for M and M2 (ii) M = 2 39 x 2 = 78 / 78 is twice 39 M2 Na 2 O 2 Final answer scores 2 23x2=46 and 6x2=32 (= 78) (b) (i) Na 2 O 2 + 2H 2 O 2NaOH + H 2 O 2 multiples and fractions 2 M all formulae correct M2 correct balancing M2 DEP on M equation csq on formula in (a)(ii), but Na and O must be in : ratio (ii) Hydroxide / OH / HO / OH
23 0 (b) (iii) M two electrons between the oxygen atoms M2 all other electrons correct M2 DEP on M Allow any combination of dots and crosses
24 (a) (i) potassium / K + K (ii) iron(ii) / Fe 2+ (iii) iodide / I I iodine / I 2 (b) M use a (clean platinum / nichrome) wire / glass rod / silica rod IGNE references to hydrochloric acid M2 (to put) solid / solution / M in/over a flame/burner M3 flame as either blue/roaring/nonluminous/bunsen/blow torch any method of introducing the solid into the flame, e.g. (wet) wooden spill / spatula / metal rod / tip or sprinkle in powder any metal that will burn or melt in a flame (e.g. magnesium) or any metal that will colour the flame (e.g. copper) tongs / tweezers / (deflagrating) spoon luminous / yellow flame burner described Bunsen/blow torch no marks if solid is in a container, e.g. test tube/tray/beaker/basin
25 (c) (i) reacts with / removes carbonate (ions) formula remove ions/substances/impurities that (form a ) precipitate (with silver ions / silver nitrate) (ii) M (hydrochloric acid) contains chloride ions M2 which interfere with test / make silver chloride M forms a (white) precipitate M2 of silver chloride removes ions that give a positive result (with silver ions / silver nitrate) gives a (white) precipitate / (false) positive result chlorine ions Do not award either mark if wrong chemistry described, eg redox reactions, formation of iodine (d) nitrate / NO 3 If both name and formula given, both must be correct
26 2 (a) 2PbS + 3O 2 2PbO + 2SO 2 Multiples and fractions 2 M all formulae correct M2 correct balancing M2 DEP on M IGNE state symbols (b) (i) Reduced AND oxygen has been removed IGNE It / PbO gains electrons Do not penalise molecules arguments based on decrease in oxidation of Pb/ gain of electrons by Pb 2+ / lead ions (ii) M Mr (PbO) = 223 (moles method) M2 n (PbO) = 44.6/223 (=0.2) M3 mass of C = 0.2/2 x 2 = (mass ratio method) M2 446 require 2 / 44.6 M require.2 /.2 Calculations with and without use of 0 6 are acceptable mark csq at each stage Correct final answer with or without working
27 scores 3 Final answers that may score 2 are: 0.6 / 2.4 / 4.8 / 0.2 / 2
28 2 (c) (i) (silver is / it is) more soluble in zinc / less soluble in lead soluble in zinc but insoluble in lead (ii) (it is) less than / equal to 530 ( C) implication that Zn and Ag melting points are both less than or equal to 530 C (iii) M zinc/it is lower / silver is higher M2 zinc turns into a vapour / gas (when heated) while silver remains M2 DEP on M IGNE references to melting point boils off (as a gas) first when heated (iv) silver is expensive / valuable
29 3 (a) (i) 4.83 (g) (ii) 3.78 (g) (iii) M n(znso 4 ) = / =0.03 M2 n(h 2 O) = / =0.2 M3 x = n(h 2 O) n(znso 4 ) = 7 CSQ on (i) and (ii) Do not penalise non-integer values of x Correct final answer with no working = Correct final answer with some correct working = 3 (b) to remove all the water NOT just to remove the water (8x 6) = ( ) x = (( ) 6) 8 = 7 equivalent alternative calculations to make sure the solid is anhydrous / fully dehydrated
30 3 (c) M anhydrous / white copper sulfate IGNE crystals anhydrous cobalt chloride / blue cobalt chloride (solid or paper) M2 turns blue if oxidation of copper given, must be +2 M2 DEP on M correct or near miss IGNE references to determining melting and/or boiling point, even if incorrect IGNE references to acid/base indicators or UI, even if incorrect turns pink if oxidation of cobalt given, must be +2 copper sulfate turns from white to blue = 2 cobalt chloride turns from blue to pink = 2 dehydrated in place of anhydrous PAPER TOTAL: 20 MARKS
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