Science Stage 9 Paper 2 Cambridge Lower Secondary Progression Test Mark Scheme 3146_02_MS_8RP © UCLES 2024 2024 S9/02 Science Stage 9 Paper 2 Mark Scheme 2024 General guidelines on marking Many descriptive answers can be expressed in a variety of ways. Professional judgement can be used in these cases, providing it matches the marking points and further information in the mark scheme. Answers may have words spelt incorrectly. Credit is normally given for phonetically correct answers, unless the word has a scientifically different meaning. For example, where the answer should be antennae, credit will be given for antena but not for anthen (too close to anther). Only the science is being assessed, so answers do not need to be grammatically correct. Significant figures will be indicated in the question or in the mark scheme. Unless specified all marking points are independent. Annotations and abbreviations / or alternate responses for the same marking point ( ) brackets the words or units in brackets do not need to be stated, for example, (recycles or releases or provides) minerals = minerals scores the mark underline exact word is required Accept an acceptable response Do not accept indicates an incorrect response that would contradict another otherwise correct alternative Ignore indicates an irrelevant answer that is not creditworthy. Full marks can still be achieved even with answers that are ignored. Note provides extra information when necessary ecf error carried forward; marks are awarded if an incorrect response has been carried forward from earlier working provided the subsequent working is correct ora or reverse argument; for example, as mass increases, volume increases could be written as mass decreases, volume decreases © UCLES 2024 Page 2 of 14 2(b) 2(a) Question 1(b) 1(a)(ii) 1(a)(i) Question © UCLES 2024 S9/02 (because) they are oppositely charged ions are attracted to each other (chlorine atom) gains one electron (sodium atom) loses one electron Answer (idea that) absorbs light (energy) Page 3 of 14 2024 Accept attraction between positive ions and negative ions = 2 marks Accept electrostatic attraction between ions = 2 marks Ignore ionic bond 2 each correct answer = 1 mark Accept sodium atom gains an electron and chlorine atom loses an electron or sodium atom loses electrons and chlorine atom gains electrons = 1 mark if no other mark is scored 2 each correct answer = 1 mark Further Information 1 Ignore to help with photosynthesis Ignore water vapour Accept O2 and CO2 carbon dioxide 2 each correct answer = 1 mark 1 Further Information Accept either order Marks Marks oxygen photosynthesis Answer Science Stage 9 Paper 2 Mark Scheme 3 Question © UCLES 2024 S9/02 Radiation needs particles to transfer thermal energy. Convection happens in liquids and gases only. ✓ ✓ Page 4 of 14 ✓ ✓ Heat dissipation happens when thermal energy transfers from a hotter region to a colder region. A liquid is a good thermal energy conductor. ✓ ✓ When thermal energy is transferred more thermal energy is created. Thermal energy always transfers from hotter objects to colder objects. ✓ Thermal energy is measured in °C. false ✓ true Heat is the word used to measure how hot an object is. sentence Answer Marks Science Stage 9 Paper 2 Mark Scheme Accept any indication of the correct answer, e.g. circling or underlining, but ticking takes precedence Note a tick in both boxes for a sentence means that sentence is incorrect one correct = 0 marks two or three correct = 1 mark four or five correct = 2 marks six or seven correct = 3 marks 4 all eight correct = 4 marks Further Information 2024 5 V Answer Page 5 of 14 convection (currents) 4(b) Question volcanic eruption or mountain building or earthquakes Answer Marks Marks Science Stage 9 Paper 2 Mark Scheme 4(a) Question © UCLES 2024 S9/02 Ignore junction of conductors voltmeter connected in parallel across one lamp = 1 mark Note ignore wire through voltmeter symbol if drawn in series 2 voltmeter symbol = 1 mark Further Information 1 Accept movement of magma Accept volcano or description of volcanic eruption 1 Accept seismic activity Further Information 2024 6(c) 6(b) 6(a) Question © UCLES 2024 S9/02 goggles Do not accept face mask Ignore gloves or heat-proof mat or laboratory coat or fume cupboard or fume hood 1 Accept local name for safety goggles Accept form crystals Accept evaporate crystallise 3 each correct answer = 1 mark correct products any order = 1 mark 2 correct reactants any order = 1 mark Accept boiling Page 6 of 14 copper + water + carbon chloride dioxide heat(ing) hydrochloric acid Further Information Accept using a funnel and filter paper + Marks filtration or filtering copper carbonate Answer Science Stage 9 Paper 2 Mark Scheme 2024 7(b) 7(a) Question © UCLES 2024 S9/02 20.0 21.0 1 increases reliability to take an average identifies anomalous results any one from temperature in °C 22.0 23.0 2 Answer 3 day 5 Page 7 of 14 4 Marks Science Stage 9 Paper 2 Mark Scheme 1 1 small square tolerance 2 Do not accept more accurate Ignore shading of bars Ignore any space between the first bar and the yaxis same thickness bars and same spacing between the bars = 1 mark Accept ± 2 graph with all five bars correct = 1 mark Further Information 2024 8 Question © UCLES 2024 S9/02 Page 8 of 14 if the Moon was created somewhere else, it would have a very different (chemical) content Moon rock and Earth rock are very similar in (chemical) composition Moon rock has less water than Earth rock (as collision evaporated all of water) Moon rock contains less iron than Earth rock (as collision blew away crust and mantle in debris) Moon rock contains material that forms quickly at high temperatures any three from Answer Marks Science Stage 9 Paper 2 Mark Scheme Accept Moon rock and Earth rock have the same (chemical) content 3 each correct answer = 1 mark Further Information 2024 10 Question 9(c) 9(b) 9(a) Question © UCLES 2024 S9/02 Answer (unit) g / cm3 (density =) 1.5 (density =) mass / volume or 150 / 100 DNA E D Answer Page 9 of 14 Marks Marks Science Stage 9 Paper 2 Mark Scheme correct units = 1 mark correct equation or substitution = 1 mark Accept 1.5 with or without working = 2 marks 3 Accept 1.5 g / cm3 with or without working = 3 marks Further Information 1 Accept deoxyribonucleic acid Accept any indication of the correct answer, e.g. ticking or underlining, but circling on answer line takes precedence 1 more than one answer circled = 0 marks Accept any indication of the correct answer, e.g. ticking or underlining, but circling on answer line takes precedence 1 more than one answer circled = 0 marks Further Information 2024 11(b) 11(a) Question © UCLES 2024 S9/02 Page 10 of 14 Accept 0.3 or 0.333 or 0.3333 etc. (resistance =) 0.33 (Ω) Ignore any unit given Accept V ÷ I (resistance =) voltage ÷ current or 1.5 ÷ 4.5 Accept equation or evidence of equation, e.g. correct substitution = 1 mark 2 Accept correct answer with or without working = 2 marks if neither box ticked accept no within the reason the current is less or the resistance is more 1 if yes ticked = 0 marks Further Information if both boxes are ticked = 0 marks Marks 2024 and no ticked (no mark) Answer Science Stage 9 Paper 2 Mark Scheme 12(b)(ii) 12(b)(i) 12(a) Question © UCLES 2024 S9/02 Page 11 of 14 Measure the air temperature twice a day for one year. 22.8 (° C) carbon dioxide or pollutants (in the air) increased (more than expected) models have improved better understanding (of the evidence) more (scientific) evidence or data any two from Answer Marks Further Information 2024 Accept any indication of the correct answer, e.g. circling or underlining, but ticking takes precedence 1 more than one answer ticked = 0 marks 1 Ignore they have changed their mind 2 each correct answer = 1 mark Science Stage 9 Paper 2 Mark Scheme Marks Page 12 of 14 1 14(b) Further Information 1 Note if A or B = 0 marks 1 Ignore wires from the buzzer Answer highest percentage of magnesium (for chlorophyll and sufficient nitrate for leaf growth) and C (no mark) Accept Mg for magnesium (idea that) it takes 5 days to make chlorophyll after magnesium is introduced 14(a) Question 13(b) Accept Mg for magnesium 2 each correct answer = 1 mark (idea that) after 5 days magnesium increases chlorophyll content any two from 13(a)(ii) 2024 Ignore universal solvent or dissolves minerals or it’s not dirty 1 Accept ora, e.g. tap water is impure Further Information Accept Mg for magnesium (idea that) (pure water) does not contain impurities or (pure water) does not contain other minerals 13(a)(i) Marks (idea that) magnesium has no effect on chlorophyll content between 0 and 5 days Answer Science Stage 9 Paper 2 Mark Scheme Question © UCLES 2024 S9/02 15 Question © UCLES 2024 S9/02 Page 13 of 14 (idea of) less food or loss of hunting grounds or starvation (idea of) less places to rest or sleep or give birth (idea of) decrease in reproduction any two from (reason) (idea of) population decrease or extinction (polar bear population) Answer Marks Further Information Accept correct answers wherever seen Accept more cubs die or more bears die or polar bears now endangered each correct reason = 1 mark 3 correct effect = 1 mark Science Stage 9 Paper 2 Mark Scheme 2024 © UCLES 2024 S9/02 Page 14 of 14 BLANK PAGE Science Stage 9 Paper 2 Mark Scheme 2024
