St Patrick's School Science EOY 2022

93 St. Patrick's School End-Of-Year Examinations 2022 SECTION A: [20 marks] Each question is provided with four possible answers (A, B, C and D). Select the most appropriate answer and shade your choice on the Optical Answer Sheet provided. 1 Which of the following is a precautionary step to take when heating a test tube of water? A Put on safety goggles before heating the test tube B Fill the test tube completely with water before heating. C Hold the test tube of water with bare hands when heating. D Point the mouth of the test tube towards yourself when heating. 2 Three bottles of chemicals with descriptions were found in the laboratory. Which row shows the correct hazard symbol to be pasted on each bottle? I II III IV V ethanol mercury sulfuric acid A II III V B IV III V C IV I II D II I IV 3 A student wants to use a ruler to measure the length of a wooden block. At which position (A, B, C or D) should the student be at to view the reading on the ruler accurately? 4 Which statement is true about a 10 g piece of iron and a 10 g bag of feathers? Given: density of iron is 7.9 g/cm3; density of feathers is 0.0025 g/cm3 A The piece of iron is lighter than the bag of feathers. B The piece of iron is heavier than the bag of feathers. C The iron has a smaller volume than the bag of feathers. D The iron takes up a larger space than the bag of feathers. 5 The following shows some information about 4 materials. • W is left with a mark when it is scratched by X. • Y can be scratched by all the other three materials. • Z can scratch the other 3 materials, W, X and Y. Which row shows the order of hardness of materials W, X, Y and Z, starting from the softest material? softest hardest A W X Y Z B W Z Y X C Y W X Z D Z X W Y 6 Which option correctly completes the statement below? Space 1 can be beaten into sheets because it is Space 2 . Space 1 Space 2 A Aluminium ductile B Brass malleable C Copper ductile D Ceramic malleable

94 7 Carbon dioxide is NOT found in the Periodic Table because it _______________. A is impure B is a mixture C is a molecule of compound D is a gas at room temperature 8 What do elements in the same group of the Periodic Table have in common? A They are all metals. B They are all non-metals. C They have similar chemical properties. D They all burn in air to form compounds. 9 An element X exists as a silvery liquid. X is also a good conductor of heat and electricity. What could element X be? A aluminium B magnesium C mercury D tungsten 10 Which statement regarding the set-ups is true? A Solute can be removed in P, but not in Q. B The solution used in P may be flammable in nature. C Q is used to separate an insoluble solid from a liquid. D P and Q can be used to separate a mixture of two liquids. 11 A paper chromatography experiment was performed to identify the dyes present in a food colouring. The following results were obtained. The dyes present in the food colouring were ______________________. A III and IV only B II, III and IV only C I, II and IV only D I, III and IV only 12 An optician holds a test card 50 cm behind a patient. The patient then looks in the plane mirror which is 100 cm away. What is the distance from the patient’s eyes to the image of the test card? A 100 cm B 150 cm C 200 cm D 250 cm

95 13 A narrow beam of white light is passed through a glass prism. Which row shows the correct order of colours emerging from the glass prism? P Q R A blue green red B blue red green C red blue green D red green blue 14 The diagram shows the changes of state for water. What are the names of the processes labelled 1 to 4? Processes 1 2 3 4 A condensation freezing melting boiling B boiling melting boiling freezing C melting condensation freezing boiling D melting boiling condensation freezing 15 Which statement(s) correctly describe(s) boiling? I Particles gain energy. II Particles move further apart. III The forces of attraction between the particles decrease. A I only B I and II only C II and III only D I, II and III 16 Which statement explains why a liquid can take the shape of any container? A Liquid particles are orderly arranged. B Liquid particles can slide past each other. C The forces of attraction between liquid particles are negligible. D Liquid particles are not as closely packed as particles in a solid. 17 Which statement is true regarding atoms and the sub-atomic particles of an atom? A Electrons have same mass as neutrons. B Atoms are the smallest particles of an element. C There are the same number of protons and neutrons in an atom. D Atoms are electrically neutral as the nucleus has neutrons which have no charge. 18 Which particle has no electrical charge? A electron B neutron C nucleon D proton 19 Which diagram contains only compounds? A B C D 20 Which chemical formula represents a compound containing 3 atoms? A CuSO4 B K2O C LiF D H2CO3

96 SECTION B: [30 marks] Answer ALL questions in this section. Show your working and write your answers in the space provided. 1 Patrick wondered whether the height of dough would increase more if there was a change in the temperature of the surroundings and decided to carry out an experiment. Fig. 1.1 shows his experimental setup using the same initial height of dough each. Fig. 1.1 (a) State a hypothesis for his experiment. …………………………………………………………………………………... …………………………………………………………………………………... [1] (b) Identify the following for his experiment. (i) independent variable: …………………………………………………... …………………………………………………………………………...... [1] (ii) dependent variable: …………………………………………………….. …………………………………………………………………………...... [1] (iii) controlled variable: …………………………………………………....... …………………………………………………………………………...... [1] 2 Table 2.1 shows information about liquids A, B and C. (a) Complete Table 2.1. Table 2.1 liquid mass (g) volume (cm3) density (g/cm3) A 150 1.5 B 80 1.25 [1] (b) Liquids A, B and C were added into a test tube. Liquid C has a density of 0.8 g/cm3. (i) Label liquids A, B and C in the correct order of density in Fig. 2.1. Fig. 2.1 [1] (ii) Using your answer in (b)(i), suggest the density of solid X. ……………………………………… g/cm3 [1] (iii) Solid X is now cut into half. Predict whether the density of each half will increase, decrease, or remain unchanged. Explain your answer. …………………………………………………………………………… …………………………………………………………………………… …………………………………………………………………………… [2]

97 3 Solid iodine is soluble in water, whereas solid substance X is insoluble in water. (a) John added solid iodine and solid substance X to water. He noticed that a suspension is formed. (i) State a difference between a solution and a suspension. ………………………………..…………………..……………………….. ………………………………..…………………..……………………….. [1] (ii) In the box below, draw a fully labelled experimental set -up to obtain solid substance X from the suspension in (a). In your diagram, label all your apparatus, iodine and substance X. Diagram of experimental set-up: [2] (b) An experiment was carried out to inv