Spm Che1 Q&a (n9)

CHEMISTRY PAPER 1 2008 NEGERI SEMBILAN 1.

Which diagram shows the correct type of particles for zinc, carbon monoxide and sodium chloride respectively?

A B C D 2.

Zinc Q Q P P

Carbon monoxide R P R Q

Sodium chloride P R Q R

The graph shows how temperature changes with time when molten X is cooled down to room temperature.

On which point of the curve are some of the molecules arranged in an orderly pattern while others are still able to move? 3.

The diagram shows the symbol form for element Z. 9

Z 4 Atom Z has …… A 4 valence electrons B a proton number of 9 4.

C a nucleon number of 13 D 4 protons and 5 neutrons

An archaeological team discovered the bones of an animal from a historical site. Which isotope is used to determine the age of the bones? A Na-24 B C-14

C Co-60 D U-235

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5.

The diagram shows the structure of an atom

Which statements are true? I the proton number is 8 II the nucleon number is 16 III the electron arrangement is 2.8 IV this model is proposed by Niels Bohr A I and III only B II and IV only 6.

C I, II and IV only D I, III and IV only

Iron rusts easily in air. Air consists of A oxygen B nitrogen

7.

C water vapour and oxygen D water vapour and nitrogen

Which ion produces a precipitate when aqueous potassium chloride is added to it? A Cu2+ B Pb2+

8.

C Fe2+ D Al3+

Which gas is used to fill weather balloons? A neon B helium

9.

C hydrogen D nitrogen

The table shows the elements in Period 3 of the Periodic Table. Element

Na

Mg

Al

Si

P

S

Cl

Ar

The oxide of which element reacts with both hydrochloric acid and aqueous sodium hydroxide? A P B S

C Si D Al

10. Boiling of palm oil with concentrated aqueous sodium hydroxide produces A soap and ester B soap and water

C soap and glycerol D soap and fatty acid

11. What is used by a diabetic patient to replace sugar in his coffee? A aspartame B acacia gum

C sodium benzoate D monosodium glutamate

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12. Which solution turns blue litmus paper red? A B C D

hydrogen chloride in tetrachloromethane glacial ethanoic acid in methybenzene aqueous sodium hydroxide bromine water

13. The flow chart for the manufacture of sulphuric acid by the Contact Process is given below. Sulphur Æ X Æ Y Æ Z Æ sulphuric acid What are compounds X, Y and Z?

A B C D

X sulphur dioxide sulphur dioxide sulphur trioxide oleum

Y oleum sulphur trioxide sulphur dioxide sulphur trioxide

Z sulphur trioxide oleum oleum sulphur dioxide

14. Which is not an application of the use of ceramic? A tiles B lenses

C dentures D spark plugs

15. What are the properties of fibre-glass that make is suitable for the manufacture of water storage tanks? I II III IV

light strong biodegradable resistant to corrosion

A I and II only B III and IV only

C I, II and IV only D II, III and IV only

16. Which is true about an exothermic reaction? A B C D

chemical bonds are formed the reaction mixture becomes cooler heat is transferred to the surroundings the products have higher heat content than the reactants

17. What are the properties of a weak alkali ? I II III IV

dissociates partially in water low concentration of OH- ions pH value less than 7 good conductor of electricity

A I and II only B I and III only

C II and IV only D II, III and IV only

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18. Which set of conditions produces the highest rate for reaction between calcium carbonate, CaCO3 and dilute hydrochloric acid? Size of CaCO3 A B C D

small chips small chips large chunks large chunks

Temperature/ oC 25 30 25 30

Concentration of HCl/moldm-3 0.5 1.0 0.5 1.0

19. The diagram shows the results of the collisions between hydrogen, H2 and iodine, I2 molecules.

Which conclusion is deduced from the diagrams?

A B C D

Result of collision no reaction reaction occurs no reaction reaction occurs

Reason molecules collide with the wrong orientation molecules have the required activation energy the iodine molecule is bigger than the hydrogen molecule molecules with the required activation energy collide with correct orientation

20. The diagram shows the Lewis structure for compound XY2 .. .. .. : Y:: X :: Y:

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Which statement is true? A B C D

XY2 dissolves in water Y accepts an electron to form YX is a metal and Y is a non-metal X is in Group 14 of the Periodic Table

21. The information below shows three characteristics of a compound Q. • • •

Soluble in water High melting and boiling points Does not conduct electricity in the solid state

What is Q? A zinc B sulphur

C calcium carbonate D potassium chloride

22. Which pair of reactants produces a displacement reaction? A B C D

zinc metal and aqueous silver nitrate copper metal and aqueous zinc chloride bromine water and aqueous potassium chloride aqueous lead(II) nitrate and aqueous copper(II) chloride

23. Which pair of reactants produces magnesium sulphate? A B C D

magnesium and sulphuric acid magnesium chloride and copper (II) sulphate magnesium carbonate and sodium sulphate magnesium oxide and lead (II) sulphate

24. Which combination is used to electroplate an iron spoon with nickel ?

A B C D

Cathode nickel plate nickel plate iron spoon iron spoon

Electrolyte nickel (II) nitrate iron (II) nitrate iron (II) nitrate nickel (II) nitrate

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25. The diagram shows how metals X and Y affect the rusting of iron.

Based on the observations, arrange X, Y and iron in order of increasing tendency to release electrons. A Y, iron, X B X, Y, iron

C X, iron, Y D iron, X, Y

26. Substance Z decolourises purple acidified potassium manganate (VII) solution. What is the general formula of Z? A CnH2n+1COOCmH2m+1 B CnH2n+1COOH

C CnH2n+2 D CnH2n

27. W is located between magnesium and iron in the reactivity series of metals towards oxygen. Which oxide is not reduced by W? A zinc oxide B silver oxide

C tin (II) oxide D copper (II) oxide

28. The diagram 5 shows a voltaic cell in which oxidation and reduction take place.

What is reduced in this cell? A sulphate ions B hydrogen ions

C copper (II) ions D hydroxide ions

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29. The Periodic Table shows four elements represented by W, X, Y and Z, which are not the actual symbols. 1 18 2 13 14 15 16 17 W X Y Z

Which statements are true? I the proton number increases in the order of W, X and Z. II W forms W2+ while X forms X2III Y and Z combine to form compound, Y2Z IV electronegativity increases in the order of W, Y and Z A I and II only B I and IV only

C II and III only D III and IV only

30. Banana flavours are made from an ester, pentyl ethanoate. Which pair of carboxylic acid and alcohol produces this ester?

A B C D

Alcohol pentanol propanol butanol ethanol

Carboxylic Acid ethanoic acid ethanoic acid propanoic acid pentanoic acid

31. Transition metals are different from alkali metals. Which differences are true? Transition elements ………….. I are harder II are more reactive III have higher densities IV have higher melting points A I and II only B II and IV only

C I, II and III only D I, III and IV only

32. The diagram shows the apparatus for the electrolysis of copper (II) sulphate solution.

What is formed at Y? A sulphur dioxide B hydrogen gas

C oxygen gas D copper

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33. The following equation represents a reaction in the presence of sunlight. H H | | H–C–C–H | | H H

H H uv | | + Cl – Cl Æ H – C – C – Cl + H – Cl | | H H

What is the reaction? A addition B oxidation

C substitution D halogenation

34. The diagram shows a simple chemical cell.

What are X and Y?

A B C D

X aluminium lead aluminium lead

Y copper aluminium magnesium zinc

35. The aqueous solutions of four different chemical substances are prepared, all having the same concentration of 1 moldm-3. I II III IV

HCl NH4OH NH4Cl H2SO4

Which sequence is true? Increasing pH Æ A I, IV, III, II B II, III, I, IV

C IV, I, III, II D IV, I, II, III

36. The table shows the voltages produced by four different pairs of metals used as electrodes in a chemical cell. Electrodes M and N M and Q O and P O and N

Negative terminal M M O O

Voltage /V 2.7 0.7 0.8 2.0

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Based on the results, arrange M, N, O and P metals according to decreasing tendency to release electron. A M, N, O, P B M, O, P, N

C N, P, O, M D O, P, N, M

37. Compound Z has the following properties: • •

Reacts with alkali to form salt and water Reacts with ethanol to form a sweet smelling compound

What is compound Z A ethane B ethane

C ethanoic acid D ethyl ethanoate

38. The structural formula of an alkene is given below. Which is an isomer for this alkene?

39. The flow chart shows the conversion of butan-1-ol to carbon dioxide gas involving two reactions. I

Butan-1-ol

→

II

But-1-ene

→

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Carbon dioxide

What are reactions I and II? I A hydrolysis B oxidation C dehydration D hydration

II addition substitution combustion combustion

40. Which reactions have the same heat of reaction? I Mg(s) + CuSO4(aq) Æ MgSO4(aq) + Cu(s) II Mg(s) + CuO(s) Æ MgO(s) + Cu(s) III Mg(s) + CuCl2(aq) Æ MgCl2(aq) + Cu(s) IV Zn(s) + CuSO4(aq) Æ ZnSO4(aq) + Cu(s) A I and III only B II and IV only

C III and IV only D I, II and III only

41. There are differences in properties between the alloy, brass, and its component pure metal, copper.

I II III IV

Alloy Atoms not regularly arranged Does not corrode More malleable Layers of atoms slide easily

Pure metal Regular and orderly arrangement of atoms Corrodes easily Less malleable Layers of atoms do not slide easily

Which are true? A I and II only B II and III only

C I, III and IV only D II, III and IV only

42. Which has the same number of atoms as 1 mole of NH3? A 1.0 mole of Al B 1.5 moles of H2O

C 2.0 moles of O2 D 2.5 moles of CO2

43. The equation represents the decomposition of YCO3 by heating. YCO3 Æ YO + CO2 How many moles of YCO3 are needed to produce 8.0 g of Y oxide? [relative atomic mass: C=12; O=16; Y=64] A 0.06 B 0.10

C 0.18 D 0.30

44. What is the number of molecules present in 1.12 dm3 of oxygen gas at S.T.P. ? [Avogadro’s constant = 6x 1023 mol-1 , molar volume = 22.4 dm3 mol-1 at STP.] A 1.12 x 1023 B 2.24 x 1023

C 3.00 x 1023 D 6.00 x 1023

45. Four neutralizations are carried out , using different combinations of acids and alkalis. Which combination, on reacting, produces the most heat? A 50 cm3 1 mol dm-3 weak acid B 50 cm3 1 mol dm-3 strong acid

50 cm3 1 mol dm-3 strong alkali 50 cm3 1 mol dm-3 strong alkali

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C 50 cm3 1 mol dm-3 strong acid D 50 cm3 1 mol dm-3 weak acid

50 cm3 1 mol dm-3 weak alkali 50 cm3 1 mol dm-3 weak alkali

46. The equation represents the reaction between zinc and hydrochloric acid. Zn + 2HCl Æ ZnCl2 + H2 Which statement is true? [relative atomic mass H=1; Zn=65; Cl=35.5, Avogadro’s constant = 6x 1023 mol-1] A 1g of zinc reacts with 2g of hydrochloric acid to produce 1g of zinc chloride and 1 g of hydrogen gas B 65g of zinc reacts with 36.5g of hydrochloric acid to produce 1g of zinc chloride and 136 g of hydrogen gas C 1mol of zinc reacts with 2 moles of hydrochloric acid to produce 1 mole of zinc chloride and 1 mole of hydrogen gas D 6x 1023 atoms of zinc reacts with 6x 1023 molecules of hydrochloric acid to produce 6x 1023 formula units of zinc chloride and 6x 1023 molecules of hydrogen gas 47. A chef has to prepare a dish of mutton curry in the shortest time. Which step helps the chef to achieve this ? A B C D

cook with small flame add a lot of curry powder use a bigger volume of water use smaller pieces of mutton

48. The diagram shows the apparatus used for an acid-alkali titration.

The equation for the neutralization is HCl + NaOH Æ NaCl + H2O What is the volume of HCl needed? A 10 cm3 B 20 cm3

49.

C 30 cm3 D 40 cm3 Ag+(aq) + Cl-(aq) Æ AgCl(s) ΔH = -58.8 kJ mol-1

The thermochemical equation above represents the preparation of AgCl from the reaction between aqueous solutions of AgNO3 and NaCl. What is the amount of heat released when 28.7g of AgCl is formed? [molar mass of AgCl=143.5 gmol-1]

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A

28.7 x58.8 kJ 143.5

C

28.7 x143.5 kJ 58.8

B

143.5 x58.8 kJ 28.7

D

58.8 x143.7 kJ 28.7

50. Water is produced when hydrogen gas reacts with oxygen, as represented by the equation: ΔH = -286 kJ mol-1

H2(g) + ½ O2(g) Æ H2O(l)

What is the amount of heat released when 12 dm3 of hydrogen gas react with 24 dm3 of oxygen? [molar volume under room conditions = 22.4 dm3 mol-1] A 572 kJ B 429 kJ

C 286 kJ D 143 kJ END OF QUESTION PAPER

ANSWERS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

B B D B C C B B D C A D B B C C A B D D D A A D A

26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

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D A C B A D D C A C B C A C A A C B C B C D D A D