2021 Sec 3 Science Chemistry EOY Deyi Secondary with Answer (1)

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BP-92 Class lndex no. Name; DEYI SECONDARY SCHOOL Science (Chemistry) 5076 05 October 2021 1115-1300h t hour 45 minutes Additional Materials: OTAS ) READ THESE INSTRUCTIONS FIRST Sectlon A Answer al! questions. For each question, there are four possible answers A, B, C and D. Choose the one you consider conect and record your choice in soft pencil on the separate OTAS. Section B Answer all questions in the spaces provided. Section C Answer all questions in the spaces provided. A copy of the Periodic Table is printed on page 21 . The use of an approved scientific calculator is expected, lvhere appropriate. Section Marks A 120 B 145 c 120 Total /8s This question paper consists of 21 printed pages PartnerlnLearning 91 [Tum over End-of-Year Examination 2021 Secondary Three Express

8P.93 2 Section A (20 marks) Answer all questions in this section in the OTAS provided. 1 Which one of the following is likely to be a pure compound? A brown solution. An oily liquid which gives two fractions when distilled. Blue crystals which melt over a range of 55oC - 60oC. Colourless crystals which all melt at 58oC. 2 An aqueous solution of sodium chloride is heated in a distillation setup. thermometer water out A B c D Ix distillation flask sodium chloride solution water in conical flask heat What is the temperature shown at X, and what are found in the distillation flask and the conical flask at the end of distillation? PartnerlnLeaming 92 I & a rl temperature at X loc contents in distillation flask contents in conical flask A 78 colourless liquid white residue B 100 coloudess liquid white residue c 100 white residue colourless liquid D 105 white residue colourless liquid

BP-94 2 4 3 Which row shows the number of sub-atomic particles in an aluminium ion, AF'? number of protons number of neutrons number of electrons A 13 14 10 B 13 14 13 c 16 27 10 D 16 27 '13 The table below shows the melting and boiling points of four substances A, B, C and D. Which substance contains particles moving at high speeds at room temperature and pressure? The figure below shows a chromatogram used to compare present in four substances W, X, Y and Z. level reached by solvent Which statement below is true? A W is present in Z. B X contains only 1 comPonent. C Y is pure. D Z contains an insoluble component. 5 substance melting point / 'C boiling point / "C A -114 5 B -50 60 G 21 40 D 't445 t I t a a wx Yz PartnerlnLearning 93 lTurn over 745

BP-95 4 6 Which diagram shows the valence electron arrangement in a molecule of ammonia? A Hi NiH .HI IH. B Hxa N H N H a c D ax H N tl a H H H What is the relative molecular NazCOe.l0HzO? mass of sodium carbonate crystals, 106 124 142 286 Three elements, X, Y and Z have consecutive, increasing proton numbers. lf element X is a noble gas, what will be the symbol for the ions of element Z in its compounds? The elements P and Q form the compound PzQ. What are the conect electronic configurations of the atoms of p and e? atom of P atom of Q A 2 1 2,6 B 2 2 2 6 c 2, 1 7 D 2,2 2 7 PartnerlnLeaming 94 aH a 7 8 I A B c D A B c D z. 22, 23, 22-

BP-96 5 10 Photosynthesis by green plants can be represented by the equation below. xCOz + 6HzO -r CoHyO, + 6Or What are the values ol x, y and /? 11 The results of the gases evolved in the reactions canied out on mmpound Y are shown. reaction result dilute nitric acid added to compound Y effervescence observed, gas formed white precipitate in limewater. compound Y is warmed with aqueous sodium hydroxide pungent gas produced, gas turned damp red litmus paper blue. What is compound Y? ammonium carbonate ammonium nitrate calcium carbonate calcium nitrate 12 Which statement about all acids is correct? A They contain both hydrogen and oxygen. B They give ammonia with an ammonium salt. C They have a pH value below 7. D They react with all metals to form hydrogen gas. A B c D x v 2 A 6 6 b B 6 12 6 c 6 6 12 D 12 6 ti PartnerlnLearning 95 ffurn over

BP- 97 6 14 15 13 Which compound is an amphoteric oxide? aluminium oxide carbon monoxide nitric oxide potassium oxide Metal M is in Group I of the Periodic Table. Which statement is conect? It forms an acidic oxide. It forms an insoluble carbonate. It forms a neutral oxide. It reacts vigorously with cold water. The table shows the colours of various indicators and the pH at which the colour changes. indicator colour change pH at which the colour changes bromothymol blue litmus methyl orange screened methyl orange yellow ) blue red ) blue red ) yellow violet ) green 7 7 4 4 Which indicators would show the same colour in aqueous sodium hydroxide? A bromothymol blue and litmus B bromothymol blue and methyl orange C litmus and methyl orange D methyl orange and screened methyl orange 16 Which reaction produces a precipitate? KzCOg + 2HCl -> 2KCl + COz + HzO ZnO + 2HCl )ZnClz + HzO NH+OH+HC/)NHnC/+HzO AgNOs + HC/ )AgC/ + HNOa PartnerlnLeaming 96 A B c D A B c D A B c D I

BP-98 7 17 18 19 Magnesium blocks are attached to the base of a boat made from iron to prevent rusting of the boat. How does the magnesium stop the iron from rusting? A Magnesium forms an alloy with the iron. B Magnesium reacts to form a protective coating of magnesium oxide on the iron. G Magnesium reacts in preference to the iron as magnesium is more reactive than iron. D Magnesium stops oxygen in the water from getting to the iron' To reduce atmospheric pollution, the waste gases from a coal-buming power station are passed through powdered calcium carbonate. Which waste gas will not be removed by powdered calcium carbonate? carlcon dioxide carbon monoxide nitrogen dioxide phosphorus (V) oxide When three unknown halogens, Xz, Yz and Zz, are reacted with halide solutions, their results are shown in the table below. Which row shows the halogens arranged in increasing order of reactivity? \z <Yz <Zz Yz<Xz <Zz Zz<Xz <Yz Zz <Yz<Xz A B c D A B c D halogen added halide solution Y. z- Xz no reaction Zz displaced Yz Xz displaced Zz displaced Zz no reaction no reaction PartnerlnLeaming 97 [Turn over x-

BP-99 8 20 20 cm3 of ethene are reacted with 60 cm3 of orygen. The equation for the reaction is shown. 40 50 80 90 A B c D CzHe (g) + gOz (g) ) 2COz (S) + 2H2O (l) All volumes are measured at r.t.p. What is the volume of carbon dioxide produced at the end of the reaction? PartnerlnLeaming cm3 cm3 cm3 cm3 98

BP- 1 00 1 Section B (45 marks) Answer all questions in this section in the spaces provided. The boxes below show the descriptions of four different substances V, W, x, Y. A white solid, V, which can be separated into two different substances by adding water and filtering. A solid, X, which melts into a silvery liquid that cannot be made into a simpler substance. A solid, W, with a fixed melting and boiling point. Heat and light are produced when a substance is bumt in air to form a white solid, Y. Deduce whether each substance should be classified as an element, a compound, a mixture or either an element or a compound. Place a tick (/) in the correct box for each substance in the table below. substance element compound mixture either an element or a compound v W x Y Name the pieces of apparatus best used to carry out the following procedures. (a) Measuring the boiling point of pure water. (b) Adding 31.0 cm3 of nitric acid into a mnical flask. (c) Collecting and measuring the volume of a water- soluble gas. (d) Adding 20.0 cm3 of sodium hydroxide to a beaker. 141 2 tll t1l t1l t1l PartnerlnLearning 99 fTurn over I