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KSE document - practice assignments
Typology: Assignments
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Mark /51 Percentage GG Grade
Q1. (a) Draw a line from each change of state to the correct name. Draw only four lines. 3 marks (b) Kate made some ice cubes from pure water. She used a sensor to measure the temperature of the ice. What temperature will the sensor show when the ice is melting? ............. °C 1 mark
Q2. Meera poured 7 cm^3 of water into a measuring cylinder. She poured 7 cm^3 of melted wax into another measuring cylinder.She put both measuring cylinders into a freezer for 24 hours. (a) Look at the measuring cylinders. What happened to the volume of the water and the wax after freezing? the volume of water ........................................................... the volume of wax ............................................................. 1 mark (b) The measuring cylinders were taken out of the freezer and left in a room at 20°C.
(c) Meera added blue copper sulphate crystals to some water in a beaker.The copper sulphate dissolved in the water. (i) Give one way Meera could see that the copper sulphate had dissolved in the water. ............................................................................................................... 1 mark (ii) Give one way that she could get the copper sulphate to dissolve more quickly. ............................................................................................................... 1 mark (d) Meera poured some of the copper sulphate solution into a dish. She left it in a warm room for a week. A week later there was a blue solid but no liquid in the dish. (i) What happened to the water in the copper sulphate solution? ............................................................................................................... 1 mark (ii) What was the blue solid left in the dish? ............................................................. 1 mark maximum 7 marks
(b) Describe how the temperatures of sensor Q and sensor R changed. sensor Q ...................................................................................................... ..................................................................................................................... sensor R ...................................................................................................... ..................................................................................................................... 2 marks (c) The next day the gauze on sensor Q felt dry. What had happened to the water on the gauze? ..................................................................................................................... 1 mark Maximum 4 marks Q4. A company has made a new material called ‘Wellwarm’. They want to use ‘Wellwarm’ to make coats. (a) A scientist tested ‘Wellwarm’ to see how well it insulated a beaker of hot water. She tested ‘Wellwarm’ and three other materials as shown below. material A material B material C material D She wrapped each beaker in a different material. She recorded the temperature at the start and 20 minutes later. (i) What was the independent variable that the scientist changed? ............................................................................................................... 1 mark (ii) What was the dependent variable that the scientist measured during the investigation? ............................................................................................................... 1 mark
(b) The results of the investigation are shown below. time temperature of water (°C) wrapped in (minutes) (^) material A material B material C material D 0 60 60 60 60 20 34 40 38 36 (i) The scientist said that the ‘Wellwarm’ material is the best insulator. Which material was ‘Wellwarm’? Use the results to help you. Tick the correct box. A B C D 1 mark (ii) Use the evidence in the results table to explain your choice. ............................................................................................................... ............................................................................................................... 1 mark (c) The company made a coat from each of the four materials they tested. A person tested the different coats by wearing each one in a cold room. He measured the temperature inside each coat for 30 minutes. Write down two other variables that should be controlled to make this a fair test.
(b) The diagram below shows particles in a gas, a solid and a liquid.Each arrow, A, B, C and D, represents a change of state. (i) Choose from the following words to complete the sentences below. boiling condensing distilling evaporating filtering freezing melting Change of state A is called ………………………………………………. Change of state B is called ………………………………………………. Change of state C is called ………………………………………………. Change of state D is called ………………………………………………. 4 marks (ii) Look back to the apparatus in part (a). Give the letter, A, B, C or D, from the diagram above, for the change of state which occurs: in the round-bottomed flask ……………………………………………… in the piece of apparatus labelled R. ……………………………………. 2 marks Maximum 9 marks
Q6. A test tube of crushed ice is taken out of a freezer and left in a warm room. The graph shows how the temperature in the test tube changes. (a) What is happening to the ice at stage B? ...................................................................................................................... 1 mark (b) Why does the temperature of the water stop rising at 23°C (stage D)? ...................................................................................................................... ...................................................................................................................... 1 mark (c) Four descriptions of the ways molecules could move are given below. They vibrate around fixed points. They move past each other and are close together. They move in straight lines, colliding occasionally. They all move in the same direction at the same speed. (i) How do the molecules move at stage A? Write A in the correct box above. 1 mark (ii) How do the molecules move at stage C? Write C in the correct box above. 1 mark
Q7. Some roads are made of concrete. The concrete is laid in sections with small gaps between them. not to scale (a) (i) What happens to the size of most objects when they get hotter? ............................................................................................................ ............................................................................................................ 1 mark (ii) When the temperature rises, what will happen to the gaps between the concrete sections? ............................................................................................................ ............................................................................................................ 1 mark (iii) When the temperature rises, what might happen to the sections of concrete if there are no gaps between them? ............................................................................................................ ............................................................................................................ 1 mark (b) The gaps between the concrete sections are filled with tar. The tar becomes soft when it is warm. Why is it important that the tar becomes soft? ...................................................................................................................... ...................................................................................................................... 1 mark Maximum 4 marks
Q8. Alan put a test-tube containing solid stearic acid into a beaker of cold water.He heated the water until it boiled. He used a temperature sensor attached to a data-logger to record the temperature of the stearic acid over a period of 35 minutes. A graph of the results is shown below. Stearic acid is a solid at room temperature.
