chijsecondarytoapayohprelim2009p1

Turn over Chijsectp.4S/E.prelim.chem1.2009

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Class Register No Name

READ THESE INSTRUCTIONS FIRST

Write in soft pencil only.

Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and register number on the answer sheet in the spaces provided.

There are forty questions on this paper. Answer all questions. For each question, there are four possible

answers A, B, C, and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet.

Read the instructions on the Answer Sheet very carefully.

Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this paper.

A copy of the Data Sheet is printed on page 2 A copy of the Periodic Table is printed on page 17.

This document consists of 17 printed pages.

C.H.I.J. SECONDARY TOA PAYOH

Preliminary Examination

Secondary Four Special & Express

CHEMISTRY 5072/01

Paper 1 Multiple Choice 16th September 2009 Wednesday 1 hour Additional Materials: Multiple Choice Answer Sheet

Soft clean eraser Soft pencil (type B or 2B is recommended)

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[Turn over chijsectp.4S/E.prelim.chem1.2009

DATA SHEET

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Melting

point/oC

350

300 m.p. of pure

250

200

Melting point/oC

350 m.p. of pure cadmium

300

250

200

0 50 100

% of cadmium in the mixture

1 Two liquids have the same boiling point and are completely soluble in each other. Which method would you use to try to separate them?

A Simple distillation

B Fractional distillation

C Chromatography

D Use of a separating funnel

2 The graph gives the melting points of mixtures of the metals cadmium and bismuth.

�

bismuth �

Which statement is true about the melting point of any mixture of cadmium and bismuth? A It must be above that of bismuth.

B It must be below that of cadmium.

C It must be below that of bismuth.

D It must be between that of cadmium and bismuth.

3 Use of the Periodic Table is relevant to this question.

In research on the atomic nucleus, scientists have been comparing the stability of isotopes with the same neutron : proton ratio.

Which isotope has the same neutron : proton ratio as 10B?

A 32P B 32S

C 40Ar D 40K

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4 The diagram below shows the arrangement of atoms in an alloy.

An alloy of two metals is harder than the metals used to make it because

A the atoms of the two metals form a more regular arrangement.

B the atoms of the two metals have weaker bonds between them.

C the layers of atoms are distorted.

D the atoms are the same size.

5 What process can be used to extract vegetable oil from fruits, seeds or nuts? A Oxidation

B Distillation

C Dehydration

D hydrogenation

6 The bar chart shows the melting points of a series of consecutive elements arranged in order of

increasing atomic number. The elements sodium to chlorine form part of this series.

Which bar represents sodium?

Atom of metal 1

Atom of metal 2

Melting point/oC

Atomic number

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7 The graph below shows how the amount of four gases in the atmosphere has changed with time.

Which of the following shows the correct set of the four gases in the atmosphere?

Graph 1 2 3 4

A nitrogen oxygen water vapour carbon dioxide

B carbon dioxide water vapour oxygen nitrogen

C oxygen nitrogen water vapour carbon dioxide

D water vapour carbon dioxide nitrogen oxygen

8 Which of the following has the same number of atoms as 6 dm3 of chlorine gas?

A 20 g of argon B 0.125 g of hydrogen gas

C 23 g of sodium D 8.5 g of ammonia

9 Molecules of two different compounds contain the same number of atoms of each element but have different arrangements of atoms. Which term correctly describes these two substances?

A allotropes B isomers

C isotopes D polymers

10 How does a catalyst function?

A by providing the same reaction pathway and increasing the average energy of the molecules

B by providing an alternative reaction pathway and increasing average energy of the molecules

C by providing the same reaction pathway with a lower activation energy

D by providing an alternative reaction pathway with a lower activation energy

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Questions 11 & 12 refer to the following table which shows the percentage (%) of carbon in wrought iron and three types of steel.

Type of Steel Carbon (%)

Wrought iron Less than 0.01

Low-carbon steel 0.03−0.25

Mild steel 0.25−0.50

High-carbon steel 0.85−1.50

11 As the percentage of carbon in the steel increases, the steel becomes A softer .

B darker.

C brittle .

D more dense.

12 To make decorative gates, iron is beaten into shape using a hammer. Which would be the best metal to make the decorative gates? A wrought iron

B Low-carbon steel

C Mild steel

D High-carbon steel

13 The nickel-cadmium rechargeable battery is based upon the following overall reaction. Cd + 2NiO(OH) + 4H2O → Cd(OH)2 + 2Ni(OH)2.H2O

What is the oxidation number of nickel at the beginning and at the end of the reaction?

beginning end

A

B

C

D

+1.5

+2

+3

+3

+2

+3

+2

+4

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14 A catalytic converter reduces the carbon monoxide and nitrogen monoxide released from a car exhaust by reacting these two gases together. The reaction is represented in the diagram, but one of the gases is missing. Which of the following should be added to complete the diagram?

A B C D 15 N2O4 is a poisonous gas. It can be disposed of safely by reaction with sodium hydroxide. N2O4(g) + 2NaOH(aq) → NaNO3(aq) + NaNO2(aq) + H2O(l)

What is the minimum volume of 0.5 mol dm−3 NaOH(aq) needed to dispose of 0.02 mol of N2O4? A 8 cm3

B 12.5 cm3

C 40 cm3

D 80 cm3

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16 The number of cars driving on the streets of a city reaches a maximum during the early morning and early evening.

The concentration of carbon monoxide in the air of a city reaches a maximum during the early morning and early evening.

Which of these is the best conclusion to draw from these data?

A Driving cars causes the rise in concentration of carbon monoxide.

B There is a correlation between the number of cars driven on the streets and the concentration of carbon monoxide.

C An increase in the number of cars results in an increase in concentration of carbon monoxide.

D There is no connection between the number of cars and concentration of carbon monoxide.

17 The bonding in phosphoric acid can be represented by the structural formula below.

H O O H

P

H O O What is the total number of electrons in the covalent bonds surrounding the phosphorus atom? A 5

B 8

C 10

D 16 18 Which of the following solutions can be used to distinguish between sodium hydroxide solution

and aqueous ammonia?

A iron(II) chloride solution

B iron(III) chloride solution

C zinc sulfate solution

D aluminium sulfate solution

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19

The diagrams above show the results obtained when three different metallic discs of the same shape and size were dropped into dilute hydrochloric acid separately.

Which metal is likely to have been placed in each beaker? beaker 1 beaker 2 beaker 3

A magnesium copper calcium

B calcium magnesium copper

C calcium copper magnesium

D copper magnesium calcium

20 Given the reaction: Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g).

Which statement correctly describes what occurs when this reaction takes place in a closed system?

A There is a net loss of mass.

B There is a net gain of mass.

C Atoms of Fe(s) lose electrons and are oxidised.

D Atoms of Fe(s) gain electrons and are reduced.

21 When a mixture of white solids is treated with an excess of dilute hydrochloric acid, a colourless gas is evolved and some, but not all of the mixture dissolves.

What could the mixture contain?

A barium chloride and calcium hydroxide

B lead(II) sulfate and calcium carbonate

C calcium carbonate and magnesium sulfate

D calcium hydroxide and magnesium carbonate

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22 Solution X was added drop-wise to a test tube containing aqueous potassium iodide and a colourless organic solvent tetrachloromethane, CCl4.

After shaking, a brown aqueous layer and a purple organic layer were obtained as shown in the diagram below.

Solution X is likely to be

A potassium bromide.

B potassium chloride

C potassium hydroxide

D potassium manganate(VII)

23 A bottle contains a powdered mixture of iron and zinc oxide. Which of the following should be added to remove the zinc oxide to obtain the iron powder?

A dilute sulfuric acid

B aqueous sodium hydroxide

C dilute ethanoic acid

D distilled water

24 Which ionic equation best describes the reaction between lead(II) nitrate and barium chloride?

A Ba+(aq) + NO3−(aq) → BaNO3(s)

B Ba2+(aq) + 2NO3−(aq) → Ba(NO3)2(s)

C Pb+(aq) + Cl−(aq) → PbCl(s)

D Pb2+(aq) + 2Cl−(aq) → PbCl2(s)

25 Which one of the following aqueous solutions contains the greatest number of ions?

A 1 dm3 of 0.1 mol/dm3 H2SO4(aq)

B 1 dm3 of 0.2 mol/dm3 HCl(aq)

C 1 dm3 of 0.05 mol/dm3 Al2(SO4)3(aq)

D 2 dm3 of 0.05 mol/dm3 CaCl2(aq)

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26 The rate of reaction between a known mass of a metal and 0.2 mol/dm3 hydrochloric acid was studied by collecting the gas in a gas syringe. The volume of hydrogen gas collected every minute was recorded. The results are shown in the graph.

No solid was observed at the end of the reaction.

How would the results change if the experiment were repeated using the same mass of metal and the same volume of hydrochloric acid, but using acid with concentration 0.4 mol/dm3?

Maximum volume of gas collected

Minimum time from start to point at which maximum volume of gas is obtained

A 50 cm3 less than 3 minutes

B 50 cm3 more than 3 minutes

C 100 cm3 less than 3 minutes

D 100 cm3 more than 3 minutes

27 The scale below shows the colour of thymol blue indicator in solutions of different pH.

pH 0 2 4 6 8 10 12 14

red yellow blue

Which pair of solutions below can be distinguished by using thymol blue indicator?

A Aqueous solutions of sulfuric acid and potassium hydroxide

B Aqueous solutions of ammonium chloride and methanol

C Aqueous solutions of ethanol and carbonic acid

D Aqueous solutions of water and ethanoic acid

Time from start / minutes

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28 Element Q has n protons and forms ions with a charge of 2−. Element R has (n + 1) protons.

Q reacts with R to form A an ionic compound, Q2R

B a covalent compound, Q2R

C an ionic compound, QR2

D a covalent compound, QR2

For Questions 29 and 30, refer to the diagram below: 29 In which of the following pairs of electrolytes will the product at Y be the same? A molten sodium chloride and dilute sodium chloride solution

B dilute sodium chloride solution and concentrated sodium chloride solution

C dilute hydrochloric acid and dilute sulfuric acid

D dilute hydrochloric acid and concentrated hydrochloric acid

30 If the electrolyte is copper(II) sulfate solution, which of the following ionic equations represents

the reaction at electrode X? A Cu2+(aq) + 2e− → Cu(s)

B Cu(s) → Cu2+(aq) + 2e−

C 2H+(aq) + 2e− → H2(g)

D C(s) → C4+(aq) + 4e−

Y (graphite)

X (graphite)

13


31 Crude oil is a mixture of chemicals.

Which one of these statements indicates that crude oil is a mixture? A It is a thick, dark coloured liquid which is less dense than water.

B It was made from the remains of animals that lived long ago.

C It can be separated into useful materials for the chemical industry.

D It is found deep underground.

32 Ethane was reacted with excess chlorine (in the presence of UV light) until there was no further

reaction. What is the relative molecular mass of the organic product?

A 64.5

B 99

C 133.5

D 237

33 Nowadays, citric acid is usually made by the fermentation of sugars.

Which one of the following is required for fermentation?

A acid

B high temperature

C light

D microorganisms

34 Which one of the following shows the correct structure of the product formed when bromine

reacts with ethene? H Br Br Br Br Br H Br

H−C—C−Br H−C = C−H Br−C—C−Br Br−C—C−H

H H Br Br H H

A B C D

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For Questions 35 & 36, refer to the following graph which shows the boiling points of the alkanes vary with the number of carbon atoms in the alkane molecules.

35 What is the boiling point of propane? A 70oC B 42oC

C −42oC D −70oC

36 Which alkane will boil if its liquid is placed in a freezer at −18oC? A C3H8 B C4H10

C C5H12 D C6H14

37 Under the Montreal Protocol, the manufacture of chlorofluorocarbons has been phased out, and

they are being replaced by fluorocarbons.

One chlorofluorocarbon which was widely used as a solvent is CCl2FCClF2. Large stocks of it remain. One process to use up these stocks is to convert it into the fluorocarbon CH2FCF3 by the following route.

CCl2FCClF2 →

1 step CCl3CF3 →2 step CCl2FCF3 →

3 step CH2FCF3

What type of reaction is step 2? A Reduction B oxidation

C addition D substitution

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38 Propene reacts with steam at 300oC in the presence of phosphoric acid as catalyst to produce a colourless liquid P.

On boiling liquid P with ethanoic acid under reflux, a colourless liquid Q is produced. What are liquids P and Q?

Liquid P Liquid Q

A C3H7OH CH3CO2C3H7

B C3H7OH C2H5CO2C3H7

C C3H7CO2H C3H7CO2CH3

D C2H5OH C2H5CO2C2H5

39 The structures of the three compounds X, Y and Z are shown below. H H H O H

X H−C — C — C — C — O — C−H

H H H H H H H H O

Y H−C — C — C — C — C — O−H

H H H H H H H O

Z H−C — C — C — C — O−H

H H

H−C−H

H Which compounds are isomers of each other? A X and Y only B Y and Z only

C X and Z only D X, Y and Z

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40 Which polymer is made by the polymerization of the monomer methyl methacrylate? CH3

H2C = C—COOCH3

methyl methacrylate

end of Paper 1

A CH3 CH3 CH3

−CH2 —C = C — CH2 — C = C — CH2 — C = C−

OCH3 OCH3 OCH3 B CH3 CH3 CH3

−CH2 —C ——CH2 ——C ——CH2 ——C−

COOCH3 COOCH3 COOCH3 C −CH CH CH−

H−C — CH3 H−C — CH3 H−C — CH3

COOCH3 COOCH3 COOCH3 D COOCH3 COOCH3 COOCH3

−C C C−

CH3 CH3 CH3

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