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This document consists of 12 printed pages. IB17 05_1113_02/6RP © UCLES 2017 [Turn over Cambridge International Examinations Cambridge Secondary 1 Checkpoint SCIENCE 1113/02 Paper 2 April 2017 MARK SCHEME Maximum Mark: 50 IMPORTANT NOTICE Mark Schemes have been issued on the basis of one copy per Assistant examiner and two copies per Team Leader. Published This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Markers were instructed to award marks. It does not indicate the details of the discussions that took place at a Markers’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes.

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2017 PUBLISHED ©UCLES 2017 Page 2 of 12 Question Answer Marks Further Information 1 An iron nail is attracted to both the south pole and the north pole of a magnet. 1Accept other indications of the correct answer e.g. ticking or circling but answer line takes precedence Question Answer Marks Further Information 2 A high pitched sound is always loud. A high pitched sound always has a high frequency.  A high pitched sound always has a large amplitude. A high pitched sound always has a low frequency. A high pitched sound must have a large wavelength. 1 more than one answer ticked = 0 marks

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2017 PUBLISHED ©UCLES 2017 Page 3 of 12 Question Answer Marks Further Information 3(a) 4 pairs of legs 5 pairs of legs 3 pairs of legs arthropods named group arachnid crustacean insect myriapod 3if more than one line from any animal = 0 marks each correct link = 1 mark 3(b) any two from all have an exoskeleton do not have a backbone / are invertebrates all have segmented bodies / bodies in sections 2 Ignore have a shell Accept bilateral symmetry

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2017 PUBLISHED ©UCLES 2017 Page 4 of 12 Question Answer Marks Further Information 4(a)(i) Al and Cl 2 1Accept aluminium and chlorine Ignore the chemical symbol Cl 4(a)(ii) CO 2 and MgCO 3 1Accept carbon dioxide and magnesium carbonate 4(a)(iii) KNO 3 and MgCO 3 1Accept potassium nitrate and magnesium carbonate 4(a)(iv) KNO 3 1Accept potassium nitrate 4(b) calcium oxide 1 Question Answer Marks Further Information 5(a) 120 J of thermal energy 1 5(b) 100 J of electrical energy 1

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2017 PUBLISHED ©UCLES 2017 Page 5 of 12 Question Answer Marks Further Information 6(a) biomass 1Accept other indications of the correct answer e.g. underlining and ticking but circling takes precedence more than one answer circled = 0 marks 6(b)(i) any three from global warming (enhanced) greenhouse effect climate change floods /drought crop failure / famine desertification sea level rise melting ice caps 3Ignore acid rain Do not accept ozone depletion and the consequences of ozone depletion e.g. skin cancer. if ozone depletion mentioned and two others correct max = 2 marks ‘pollution’ unqualified = 0 marks Ignore carbon dioxide is poisonous Ignore animals killed / habitats destroyed unless qualified e.g. coral reef destruction 6(b)(ii) wood (no mark) can be grown again / (idea of) recycles carbon / no increase in atmospheric CO 2 levels / (idea that) it is renewable or hydrogen (no mark) burns to form water / does not produce CO 2 / renewable 1the mark is for the explanation

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2017 PUBLISHED ©UCLES 2017 Page 6 of 12 Question Answer Marks Further Information 7(a) As the atomic mass increases the melting point increases . or As the atomic mass decreases the melting point decreases . 1The sentences must be comparative Accept gets bigger / gets larger instead of increase Accept atomic mass gets heavier for increase Accept gets smaller instead of decrease Accept atomic mass gets lighter for decrease 7(b) gas 1 7(c) –34 (C) 1Accept other indications of correct answer e.g. circling or underlining but answer line takes precedence

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2017 PUBLISHED ©UCLES 2017 Page 7 of 12 Question Answer Marks Further Information 8 red magentacyan yellow green white blue 2all three correct = 2 marks one or two correct = 1 mark Question Answer Marks Further Information 9 the Sun 1Accept star

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2017 PUBLISHED ©UCLES 2017 Page 8 of 12 Question Answer Marks Further Information 10(a)(i) type (amoun t of)fertili ser use d 1 Accep ttrea tmen t 10(a)(ii) any two from number of seeds / number of plants amount of fertiliser time temperature lighting / sunlight the soil 2 Ignore number of peppers Accept volume of fertilizer / amount of treatment / volume of treatment / concentration of fertiliser Accept kept in the same greenhouse Accept variety of peppers Accept have plants same distance apart Ignore amount of water 10(a)(iii) as a control / as a comparison 1Accept to see the effect of fertiliser 10(b)(i) (idea that) fertiliser makes them grow taller (artificial fertiliser is best) 1answer must be comparative 10(b)(ii) (idea that fertilizer) increases (number of peppers) 1answer must be comparative Accept doubles / trebles yield / more peppers with fertilizer Accept most with artificial fertiliser / least with water

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2017 PUBLISHED ©UCLES 2017 Page 9 of 12 Question Answer Marks Further Information 11 metal water acid sodium violent reaction to form hydrogen (1) violent reaction to form hydrogen calcium bubbles and gives hydrogen rapid bubbles to form hydrogen (1) iron no reaction a slow formation of hydrogen bubbles (1) copper no reaction (1) no reaction gold no reaction no reaction (1) 5 Accept lots of bubbles and forms hydrogen / flames and forms hydrogen / quick reaction and forms hydrogen Accept violent reaction to form hydrogen / lots of bubbles and forms hydrogen / quick reaction and forms hydrogen Accept reaction to form hydrogen

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2017 PUBLISHED ©UCLES 2017 Page 10 of 12 Question Answer Marks Further Information 12 (book) B (no mark) (idea of) small(est) area (in contact with table) 1 Accept smaller area gives a larger pressure Accept ora if A specified Question Answer Marks Further Information 13 any three from Mike’s moment and Oliver’s moment are equal (must be stated) (idea that) Mike is half the weight of Oliver / Oliver is twice the weight of Mike (idea that) Mike is twice as far from the pivot than Oliver / Oliver is half the distance from the pivot compared to Mike Mike’s moment is 500 × 2 or 1000 (Nm) Oliver’s moment is 1000 × 1 or 1000 (Nm) 3Accept force for weight Do not award this marking point if mass is used instead of weight Ignore units Do not accept force is 1000 Accept 500 × 2 = 1000 × 1 for all three marks

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2017 PUBLISHED ©UCLES 2017 Page 11 of 12 Question Answer Marks Further Information 14(a) decrease 1Accept it will get colder Accept quoted temperature values less than 20 oC 14(b) carbon dioxide / CO 2 water / H 2O 2if both name and formulae are given both must be correct if both products are correct but reversed = 1 mark Question Answer Marks Further Information 15(a) air particles heat particles light particles solid particles sound particles 1Accept other indications of correct answer but circle takes precedence more than one answer circled = 0 marks 15(b) Area A is called a compression because the particles are close together. Area B is called a rarefaction because the particles are far apart. 2Accept any (idea that) the particles are close Ignore particles are compressed together Accept any (idea that) the particles are apart

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2017 PUBLISHED ©UCLES 2017 Page 12 of 12 Question Answer Marks Further Information 16 The particles have less energy. The particles move closer together.  The particles move slower. The particles spread out.  1more than one tick = 0 marks Question Answer Marks Further Information 17(a) Planet A Mercury Planet B Venus 1both correct = 1 mark 17(b) F 1Ignore name 17(c) 3 4 5 6 7 1Accept other indications of correct answer but circle takes precedence more than one answer circled = 0 marks