Cambridge Checkpoint Science P2 Specimen 2012

Cambridge Checkpoint Science P2 Specimen 2012 - UNIVERSITY...

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This document consists of 15 printed pages and 1 blank page. © UCLES 2011 [Turn over For Examiner's Use 1 2 3 4 5 6 7 8 9 10 Total UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS Cambridge Checkpoint SCIENCE 1113/02 Paper 2 For Examination from 2012 SPECIMEN PAPER 45 minutes Candidates answer on the Question Paper. Additional Materials: Ruler READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. Answer all questions. You should show all your working in the booklet. The number of marks is given in brackets [ ] at the end of each question or part question. The total number of marks for this paper is 50.
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2 © UCLES 2011 1113/02/SP/12 BLANK PAGE
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3 © UCLES 2011 1113/02/SP/12 [Turn over For Examiner's Use 1 Litmus is made from a plant pigment. It is red when placed in an acidic solution. It is blue when placed in an alkaline solution. It is purple when neutral. (a) What do we call substances that change colour like this? [1] (b) What colour would litmus be in a solution of pH 10? [1] (c) What colour would you expect litmus to be in pure water? [1] (d) Excess acid in the stomach can cause indigestion. What would be the safest thing to neutralise excess acid in the stomach? Tick ( ± ) the correct box. vinegar (acid) salt water (neutral) sodium hydrogencarbonate (mild alkali) caustic soda (strong alkali) [1]
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© UCLES 2011 1113/02/SP/12 For Examiner's Use 2 A plant called Himalayan balsam produces seed pods. These pods explode and the seeds shoot out in all directions. (a) Carlos finds 175 seeds on the ground around a Himalayan balsam plant. He measures the distance of each seed from the plant. The table shows his results. distance of seeds from plant / cm 0–50 51–100 101–150 151–200 201–250 251–300 number of seeds 55 45 30 25 15 5 (i) Draw a histogram to display these results. 60 50 40 30 20 10 0 0 50 100 150 200 250 300 350 number of seeds distance travelled by seeds / cm [3] (ii) How many seeds travelled more than 200 cm? [1]
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Cambridge Checkpoint Science P2 Specimen 2012 - UNIVERSITY...

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