Year 8 Module 2 Practice Paper

Transcription

1 Year 8 Module 2 Practice Paper Brockington College minutes marks These questions are indicative of the work covered by all pupils, and as such some questions may be above or below the level appropriate to any one individual. They represent the content, but not necessarily the content of the test. Page 1 of 23

2 Q1. In the experiment shown below, metal and acid react together to make hydrogen gas. (a) Look at the flask. How can you tell that a gas is being produced in this experiment?... (b) (i) Hydrogen gas passes through the water and collects in the test-tube. What does this tell you about hydrogen? Tick the correct box. It dissolves in the water. It does not dissolve in the water. It is acidic. It is alkaline. What happens to the level of the water in the test-tube as hydrogen is produced? Air contains the following gases: nitrogen oxygen water vapour carbon dioxide Page 2 of 23

3 Choose from these gases to answer the questions below. (i) Which one of the four gases do we need to take into the blood in the lungs?... Which one of the four gases can produce droplets on a cold window?... Maximum 5 marks Q2. The diagram below shows part of the respiratory system. (a) From the diagram, give the letters which label: (i) the trachea; alveoli. (b) (i) Which gas passes into the blood from the alveoli?. Which gas passes out of the blood into the alveoli?. Page 3 of 23

4 The walls of the capillaries and the alveoli are very thin. Why do they need to be thin?.. (d) There are millions of alveoli in the lungs. They provide a very large surface area. Why is a large surface area necessary?.. Maximum 6 marks Q3. (a) Air is a mixture of gases. The pie chart represents the percentages of different gases in air. On the line by each section of the pie chart, write the name of the correct gas. Two have been done for you. not to scale 2 marks (b) On a cold day, droplets of water form on a cold window. Explain how these droplets form marks Page 4 of 23

5 The word equation below represents a process taking place in the cells of the human body. glucose + oxygen? carbon dioxide + water (i) What process does this word equation represent?... As a result of this process, the proportions of oxygen and carbon dioxide in air breathed in and air breathed out change. Which one of the statements below is true? Tick the correct box. maximum 6 marks Q4. The table shows how hydrogencarbonate indicator solution changes colour when the concentration of carbon dioxide in it changes. concentration of carbon dioxide increases decreases colour change orange to yellow orange to purple Sunil set up the experiment shown below and put both test-tubes on a window-sill. Page 5 of 23

6 Use information in the table to help you answer the questions below. (a) The indicator in test-tube A changed from orange to yellow. (i) What process, in the cells of the maggots, caused this colour change? Explain what happens in this process to cause the colour change. (b) The indicator in test-tube B changed from orange to purple. (i) What process, in the cells of the leaves, caused this colour change? Explain what happens in this process to cause the colour change. Sunil then put two fresh leaves into test-tube C containing 30 cm 3 of orange hydrogencarbonate indicator. He added some maggots on a piece of wire mesh as shown below. He put the test-tube on a window-sill. The indicator remained orange. Explain why maximum 5 marks Page 6 of 23

7 ## (a) The table shows some of the properties of three different substances, X, Y and Z. Complete the last column by stating whether each substance is a metal, a nonmetal or a compound. 3 marks (b) Complete the following using one of the phrases. Closer together further apart in contact with more particles Substance Z has a boiling point of 161 C. At room temperature the particles of Z are... than the particles of substance X. Substance Z burns in air. What must be present in air for substance Z to burn?... Maximum 5 marks Q6. Copper can be obtained form its ore, copper sulphide, in two stages. First stage Second stage heating the ore in air Copper sulphide reacts with oxygen from the air to form copper oxide and sulphur dioxide gas. heating the copper oxide with carbon Copper oxide reacts with carbon to form copper and carbon dioxide gas. Page 7 of 23

8 (a) Give the names of three elements mentioned above (b) Give the name of one compound mentioned above.... Give the name of the compound, mentioned above which causes acid rain.... Maximum 3 marks Q7. The table shows the chemical formulae of six minerals which occur naturally. From the table give the name of one mineral which is: (i) a non-metallic element.... a carbonate.... (iii) a compound containing potassium.... (iv) an electrical conductor at room temperature.... Maximum 4 marks Page 8 of 23

9 Q8. A pupil does four experiments with bar magnets and small, unmagnetised iron bars. She places them as shown below. For each experiment, tick one box to show the effect of the magnetic force between the two objects. 4 marks Page 9 of 23

10 Q9. The drawing shows a toy shark. Magnets X and Y make the shark float above the plastic base. (a) On magnet X, write the letters N and S to label the poles of the magnet. (b) (i) Choose a word from the list below to complete the sentence. attract cancel repel The toy shark floats because the magnets... each other. Sophie pressed down on the tail of the shark with her finger. What happened to the shark when she removed her finger? Sophie added weights to the toy shark and measured the distance between the two magnets. Her results are shown below. weight added to the toy shark (N) distance between the magnets (mm) Complete the sentence below. As the weight on the toy shark increased, the distance between the magnets... Page 10 of 23

11 (d) Sophie turned the magnet in the plastic base the other way up. What happened to the shark?... maximum 5 marks Q10. Alex makes an electromagnet. She winds insulated wire around an iron nail. She connects the wire to a power supply. She uses the electromagnet to pick up some steel paper-clips. This is her prediction. The more turns of wire around the iron nail the stronger the electromagnet becomes. (a) (i) Give the one factor she should change as she investigates her prediction. Give one factor she should keep the same. (iii) Describe how she could use the paper-clips to measure the strength of the electromagnet. Page 11 of 23

12 (b) Alex wrote a report of her investigation. What would an odd result suggest? (i) Which size paper-clips would Alex use to make her results more accurate? Tick the correct box. Give a reason for your choice. maximum 6 marks Page 12 of 23

13 Q11. A pupil wound a coil of copper wire around a glass tube and connected the wire to a battery. She placed a compass at each end of the tube and one compass beside the tube as shown. (a) (i) Complete the diagram by drawing arrows in compasses X and Y to show the direction of the magnetic field. 2 marks (iii) Draw an arrow in the middle of the glass tube to show the direction of the magnetic field in the glass tube. When the switch is opened, in which direction will the three compass needles point?... (b) Give one way to reverse the magnetic field around the glass tube Two pieces of iron are placed inside the glass tube. (i) When the switch is closed, the magnetic field is the same as in the diagram opposite. The pieces of iron become magnetised. Label the four poles on the pieces of iron. Page 13 of 23

14 When the switch was closed, the pieces of iron moved. Explain why they moved Maximum 7 marks Page 14 of 23

15 M1. (a) bubbles are formed accept fizzing accept effervescence 1 (L3) (b) (i) It does not dissolve in the water. (i) oxygen if more than one box is ticked, award no mark it goes down do not accept it goes up the test-tube 1 (L4) 1 (L3) 1 (L3) water vapour accept water or steam do not accept condensation 1 (L3) [5] M2. (a) (i) P 1 (L5) S 1 (L5) (b) (i) oxygen 1 (L5) carbon dioxide 1 (L6) so that oxygen or carbon dioxide or gases can pass through quickly or easily do not accept so air can pass through easily do not accept so that oxygen can pass through accept so they can expand easily 1 (L6) Page 15 of 23

16 (d) any one from so that a lot of oxygen can be absorbed or taken in accept so that enough oxygen or carbon dioxide or gas can pass through the body needs a lot of oxygen so that a lot of carbon dioxide can be removed accept so that gas can pass through quickly 1 (L6) [6] M3. (a) 2 (L6) (b) water vapour accept vapour water or moisture are insufficient condenses accept turns into water or a liquid accept forms condensation 1 (L5) 1 (L5) (i) respiration 1 (L6) Air breathed out has more carbon dioxide and less oxygen than air breathed in. if more than one box is ticked, award no mark 1 (L6) [6] Page 16 of 23

17 M4. (a) (i) respiration 1 (L7) carbon dioxide is produced accept maggots breathe out carbon dioxide 1 (L7) (b) (i) photosynthesis 1 (L7) any one from carbon dioxide is used up carbon dioxide reacts with water in the plant accept the carbon dioxide reacts with water carbon dioxide is absorbed is insufficient do not accept the carbon dioxide reacts with water in the tube 1 (L7) any one from carbon dioxide produced by respiration was used up in photosynthesis carbon dioxide produced by the maggots is used in photosynthesis carbon dioxide produced by the maggots was used by the leaves answers must refer either to respiration or maggots and photosynthesis or leaves the concentration of carbon dioxide remains unchanged is insufficient 1 (L7) [5] M5. (a) X non-metal do not accept non-metallic compound 1 Y metal Z compound do not accept metallic compound 1 1 (b) further apart 1 oxygen 1 [5] Page 17 of 23

18 M6. (a) copper oxygen carbon answers may be in any order all three elements are required for the mark accept correct symbols for the elements accept sulphur as one of the three elements 1 (L5) (b) any one from copper sulphide copper oxide sulphur dioxide carbon dioxide 1 (L5) sulphur dioxide do not accept carbon dioxide 1 (L5) [3] M7. (i) graphite do not accept C 1 (L7) calcite do not accept CaCO 3 1 (L7) (iii) saltpetre do not accept KNO 3 1 (L7) (iv) gold or graphite do not accept Au or C 1 (L7) [4] Page 18 of 23

19 M8. A no effect 1 (L3) B C D they attract they repel they attract if more than one box is ticked award no mark 1 (L3) 1 (L4) 1 (L3) [4] M9. (a) both poles are required for the mark S 1 (L4) (b) (i) repel 1 (L4) it moved upwards or returned to its original position accept it would move up and down 1 (L4) decreased accept got smaller ; accept moved closer 1 (L4) (d) any one from it was attracted to the base accept the magnets are attracting accept the N and S poles attract it moved down accept it would not float it sank accept it would stick to the base 1 (L4) [5] Page 19 of 23

20 M10. (a) (i) the number of turns or coils of wire accept the coils accept the turns 1 (L5) any one from the current the length or thickness or material of the wire or coil accept the voltage or power accept the wire the circumference of the coil the size of paper-clips accept the paper-clips ; position of the coil on the nail ; tightness of the coil ; accept distance between turns ; the nail do not accept the number of paper-clips 1 (L5) (iii) any one from count the paper-clips picked up accept number of paper-clips ; count them measure their mass accept weigh them ; the more clips the stronger the magnet ; measure the distance at which a magnet will just pick up a paper-clip 1 (L5) (b) any one from an inaccuracy in results accept a description of inaccuracies, such as she counted the number of clips wrongly a problem with the data or results a problem with the method accept something wrong with the tests accept she used different sized paper-clips accept the paper-clips were already magnetised accept she did something wrong the test is unfair is insufficient 1 (L6) (i) if more than one box is ticked, award no mark 1 (L6) Page 20 of 23

21 any one from with bigger paper-clips she might miss the precise point at which the electromagnet stopped picking up paper-clips accept she would pick up differences between the number of turns of the coil accept she might not see a change with big paper-clips or she would see a change with smaller paper-clips it will pick up a few large paper-clips but a lot of small paper-clips is insufficient the smaller paper-clips might help to identify the precise point at which the electromagnet stopped picking up paper-clips accept it is more precise or more sensitive award a mark for a response identifying that greater precision is possible with smaller increments they are smaller is insufficient 1 (L6) [6] M11. (a) (i) award one mark for each correctly drawn arrow the arrows must be drawn in the compasses 2 the arrow must be drawn in the tube 1 (iii) North do not accept the same direction 1 Page 21 of 23

22 (b) any one from reverse the battery (i) wind the coil in the other direction accept connect the battery the other way round or change the direction of the flow of electricity accept reverse the coil do not accept turn the glass tube around 1 all four poles are required for the mark 1 they attract each other accept they attract or unlike poles attract do not accept they are magnetised 1 [7] Page 22 of 23

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