caustic soda (strong alkali) [1]

Transcription

1 3 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. Examiner's (a) What do we call substances that change colour like this? (b) What colour would litmus be in a solution of ph 10? (c) What colour would you expect litmus to be in pure water? (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) UCLES /02/SP/12 [Turn over

2 6 3 The diagram shows the Earth moving around the Sun. Examiner's Sun (a) What causes day and night on Earth? Tick ( ) the correct box. The Earth moves round the Sun once every 24 hours. The Earth spins on its axis once every 24 hours. The Sun moves round the Earth once every 24 hours. The Sun spins on its axis once every 24 hours. (b) Two students are discussing the Sun and the Moon. Luca says: The Sun gives out light that it produces itself. Anya says: The Moon does not give out light. It only reflects light from the Sun. Who is correct? Tick ( ) the correct box. Luca only Anya only both Luca and Anya neither Luca nor Anya (c) Underline the two words in the list that are the names of planets. Earth Jupiter Moon Sun UCLES /02/SP/12

3 8 5 Sam and Shakira make an electromagnet as shown. iron core Examiner's power supply coil of insulated copper wire iron filings Their teacher asks them to plan an experiment to answer this question. Does wrapping more coils around the magnet make it stronger? She tells them that they can test the strength of their magnets by measuring the mass of iron filings that they pick up. The diagram shows the changes that Sam and Shakira make to their magnets when they begin their experiment. iron core iron core power supply coils made of insulated steel wire power supply coils made of insulated copper wire iron filings iron filings Sam Shakira (a) Explain why Sam s experiment will not answer the teacher s question. [2] UCLES /02/SP/12

4 9 (b) These are the results that Shakira writes down. She writes them in the order that she collects them. number of coils 5, 10, 15, 20, 25, 30 Examiner's mass of iron filings in grams 2, 6, 23, 18, 22, 25 (i) In the space, draw a results table and complete it by writing in Shakira s results. a ruler to draw your results chart. [2] (ii) Describe the pattern in Shakira s results. (iii) In your results chart, draw a circle around the result that does not fit the pattern. (iv) Suggest one way in which Shakira could make her results more reliable. UCLES /02/SP/12 [Turn over

5 12 7 Write the missing terms in these energy transformation diagrams. Examiner's UCLES /02/SP/12

6 3 Complete each explanation using these words. 3 area force pressure (a) People who walk across snow may wear snowshoes. The person does not sink into the snow because the acts on a larger so that the is less. (b) A sharp knife cuts through cheese more easily than a blunt knife. The edge of the sharp knife has a smaller so the acting on the knife produces a larger. UCLES /02/SP/14 [Turn over

7 4 Plants and green algae need mineral salts to grow. One mineral salt is magnesium sulfate. 4 Ahmed and Safia investigate the growth of algae. They put different concentrations of magnesium sulfate solution into five flasks, A, B, C, D and E. They then add the algae. measure 10 cm 3 of algae using a syringe leave for 5 days A B C D E add 10 cm 3 of algae to each flask (a) Why did Ahmed and Safia put 10 cm 3 of algae into each flask? (b) Why did they leave the flasks for 5 days? UCLES /02/SP/14

8 5 (c) Here are their results. flask concentration of magnesium sulfate (1 = dilute, 5 = most concentrated) colour of algae (1 = light green, 10 = dark green) A 1 4 B 2 5 C 3 8 D 4 10 E 5 1 Complete the sentence to describe the pattern of their results. As the concentration of magnesium sulfate increases from 1 to 5, the colour of the algae [2] (d) When the colour of the algae is dark green it has grown the most. Complete the sentence. Choose a word from the list. carbon dioxide fastest the same slowest sugar water When the concentration of magnesium sulfate is 4 the algae grow. UCLES /02/SP/14 [Turn over

9 8 7 The diagram shows a palisade cell. nucleus chloroplast vacuole cell membrane cell wall cytoplasm (a) Which three structures, labelled in the diagram, are not found in animal cells? [3] (b) Name the part of the cell in which photosynthesis takes place. 8 The Earth is made up of three layers including the core and the crust. (a) What is the name of the other layer? (b) The core is made up of mainly two metals. One of these metals is nickel. What is the name of the other metal? UCLES /02/SP/14

10 (c) What is the approximate age of the Earth? Tick ( ) the correct box million years old 1200 million years old 2100 million years old 3200 million years old 4600 million years old 9 The diagram shows the energy flow into and out of a coal-fired power station. 70 MJ wasted in friction energy wasted 30 MJ wasted in heating wires 300 MJ electricity 1000 MJ in coal coal boiler, turbine and generator cooling tower transformer (a) How much useful electrical energy is provided by the power station? MJ (b) Calculate how much energy is wasted from the cooling tower? MJ UCLES /02/SP/14 [Turn over

11 10 10 Manjit puts a metal saucepan of milk on a cooker. metal saucepan hot milk hot-plate heat Thermal (heat) energy can be transferred by conduction, convection and radiation. (a) Which is the main process that transfers thermal energy through the milk? (b) Which is the main process that transfers thermal energy through the metal saucepan? UCLES /02/SP/14

12 15 15 This is a question about forces. Look at the diagrams. force force nut spanner A gravity pulling parachutist to Earth B force force chest expanders force force see-saw force C D E Which diagrams show a turning force? Choose from A, B, C, D and E. and [2] UCLES /02/SP/14 [Turn over

13 2 1 The elements in the periodic table have different chemical symbols. Draw lines to connect the element to its chemical symbol. Teacher's element aluminium chemical symbol K argon Ca potassium C calcium Ar carbon Al [3] UCLES 2011 P110/01/A/M/11

14 3 2 Sound waves can be seen on an oscilloscope trace. Teacher's wave A time wave B time wave C time wave D time (a) Which wave has the highest pitch? (b) (i) Which wave is the loudest? (ii) Which property of the wave makes it the loudest? Underline the answer from the list. low amplitude high amplitude low frequency high frequency UCLES 2011 P110/01/A/M/11 [Turn over

15 6 4 White light can be split into the visible spectrum. Teacher's white light red light visible spectrum violet light (a) What word describes the splitting of white light into different colours? Underline the answer from the list. absorption dispersion reflection refraction subtraction UCLES 2011 P110/01/A/M/11

16 7 (b) The white light is split into colours. Put the colours in the correct order as they appear in the visible spectrum. Teacher's The first three have been done for you. colour order orange 2 green red 1 yellow 3 blue violet indigo [2] (c) In the diagram, a prism is used to split the white light into different colours. Name something else that can split white light. UCLES 2011 P110/01/A/M/11 [Turn over

17 8 5 Janya measures the speed of her dog running. Teacher's (a) (i) Her dog runs 100 m in 20 seconds. What is the average speed of the dog? Average speed is units [2] (ii) Why is it the average speed and not just the speed? UCLES 2011 P110/01/A/M/11

18 9 (b) Janya draws three distance/time graphs of her dog running. each graph describe the motion of the dog. Teacher's Choose from: A The dog is running at a constant speed. B The dog is slowing down. C The dog is speeding up. D The dog is not moving. (i) distance Choose from A, B, C or D. time (ii) distance Choose from A, B, C or D. time (iii) distance Choose from A, B, C or D. time UCLES 2011 P110/01/A/M/11 [Turn over

19 10 6 Amrit investigates the enzyme amylase. She already knows these facts. Teacher's The enzyme amylase breaks down starch in the mouth. The ph in the mouth is 7. Iodine solution is very dark blue when there is starch. Iodine solution is yellow when there is no starch. (a) She uses this apparatus. acid acid water alkali alkali ph3 ph5 ph7 ph9 ph11 iodine starch solution amylase solution stopwatch measuring cylinder (i) At which ph do you predict the enzyme amylase will work best? UCLES 2011 P110/01/A/M/11

20 11 (ii) Amrit wants to check her prediction by doing an investigation. Some variables need to be kept the same and some need to be changed. Tick ( ) the variables she needs to keep the same. Teacher's variable volume of starch added ph of the solution temperature of the solution volume of amylase added (iii) Amrit wants to control risks when carrying out this investigation. Suggest one way she could make sure she is safe. (b) Amrit writes her results in a table. ph result 3 stays dark blue 5 changes from dark blue to yellow very slowly 7 changes from dark blue to yellow very quickly 9 changes from dark blue to yellow very slowly 11 stays dark blue (i) What conclusions can you draw from Amrit s results? [2] (ii) Suggest two different ways to improve Amrit s investigation. 1 2 [2] UCLES 2011 P110/01/A/M/11 [Turn over

21 14 9 Rusting is an example of a chemical reaction that is not useful. (a) Mia investigates the conditions needed for iron nails to rust. She uses this equipment. Teacher's air oil water boiled water calcium chloride A water and air B no air C dry air (i) In which boiling tube will the nail go rusty? (ii) Complete the equation to describe this reaction. Choose words from the list. aluminium carbon dioxide iron oxygen water rust [2] (b) Describe two things Mia could do to iron to stop it from rusting. 1 2 [2] UCLES 2011 P110/01/A/M/11

22 16 11 The growth rates of babies are checked regularly using growth charts. 105 Teacher's height / cm age / months (a) This growth chart measures the height of a healthy baby boy. What other measurement of the baby boy could be used to draw a growth chart? (b) Why is it important that doctors use growth charts? (c) A baby boy was 55 cm at birth. He has a poor diet and is malnourished (is not fed enough). Draw a line on the growth chart to show the growth of this baby boy. UCLES 2011 P110/01/A/M/11

23 17 12 Chemicals can be elements or compounds. Tick ( ) the box to show which chemicals are elements and which chemicals are compounds. Teacher's The first one has been done for you. chemical (formulae) element compound water (H 2 O) carbon dioxide (CO 2 ) hydrogen (H 2 ) helium (He) magnesium (Mg) [2] UCLES 2011 P110/01/A/M/11 [Turn over