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UNIVERSITY OF CAMBRIDGE LOCAL EXAMINATIONS SYNDICATE General Certificate of Education Ordinary Level
5070/1
CHEMISTRY PAPER 1 Multiple Multipl e Choice Tuesday
16 NOVE NOVEMB MBER ER 19 1999 99
1 hour hour
Additional materials: Electronic calculator and/or Mathematical tables Multiple choice answer sheet Soft clean eraser Soft pencil (type B or HB HB is recommended)
TIME
1 hour
INSTRUCTIONS TO CANDIDATES Do not open this booklet until you are told to do so. Write your name, Centre number and candidate number on the answer sheet in the spaces provided unless this has already been done for you. There are forty questions in 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 very carefully the instructions on the answer sheet. INFORMATION FOR CANDIDATES Each correct answer will score one mark. A mark will not be deducted for a wrong answer. answer. Any rough working should be done in this booklet. Mathematical tables are available. available. You You may use a calculator. A copy of the Periodic Table Table is printed on page 16.
This question paper consists of 15 printed pages and 1 blank page. SB (KG) QK94129/4 © UCLES 1999
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2 1
An atom of an element contains 17 protons, 18 neutrons and 17 electrons. What is the atomic structure of another isotope of this element? protons
2
neutrons
electrons
A
17
20
17
B
17
18
16
C
18
18
17
D
20
18
17
An inflated balloon goes down because gas molecules can diffuse through the rubber. Four balloons are filled with different gases at the same temperature and pressure. Which balloon would go down most quickly? A
carbon dioxide, CO2
3
4
B
C
methane, CH4
nitrogen, N2
D
oxygen, O2
Which statement explains why oxygen can be separated from nitrogen by the fractional distillation of liquid air? A
Oxygen is more dense than nitrogen.
B
Oxygen is more reactive than nitrogen.
C
The two elements have different boiling points.
D
The two gases g ases are in different groups of the Periodic Table. Table.
Which of the following is the best method of obtaining pure water from ink? A
chromatography
B
distillation
C
filtration
D
freezing
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3 5
Hydrogen chloride is very soluble in water, whereas chlorine is only slightly soluble in water. Both gases can be dried using concentrated sulphuric acid. Which diagram represents the correct method of obtaining dry chlorine from damp chlorine containing a small amount of hydrogen chloride? A
B
damp Cl 2 and HCl
damp Cl 2 and HCl
concentrated sulphuric acid
water
water
C
D
damp Cl 2 and HCl
concentrated sulphuric acid
6
concentrated sulphuric acid
damp Cl 2 and HCl
water
water
concentrated sulphuric acid
What do bot both h an atom atom and and an ion ion of the the isotop isotope e of sodiu sodium, m, 23 contain? in? 11 Na, conta A
11 electrons
B
12 neutrons
C
23 protons
D
23 neutrons
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4 7
The diagram represents an atom of an element. e
5n 4p
e
key e = electron n = neutron p = proton
e
e Which symbol gives this information? A
8
9
9 4 Be
B
9 5B
C
4 9F
13 8O
D
Which substance in the table is an ionic compound?
substance
stat state e at room room temperature
elec electr tric ical al cond conduc ucti tivi vity ty at room temperature
elec electr tric ical al cond conduc ucti tivi vity ty of aq aqueous solution
A
liquid
good
B
liquid
poor
poor
C
solid
good
good
D
solid
poor
good
insoluble
The bonding in sulphuric acid can be represented by the structure shown. H
O
O
S H
O
O
What is the total number of electrons in the covalent bonds surrounding the sulphur atom? A
4
B
6
C
D
8
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12
5 10 An excess of hydrochloric acid is added to 0.10 mol of magnesium in the apparatus shown.
100 cm3 syringe
dilute hydrochloric acid magnesium
Why is it impossible to measure the total volume of hydrogen produced using this apparatus? A
Hydrogen is less dense than air.
B
Hydrogen is soluble in hydrochloric acid.
C
There is air in the tube.
D
The volume of hydrogen hydrogen formed is greater than 100 cm3.
11 20cm3 of oxygen oxygen are reacted with with 20 cm3 of carbon monoxide. What are the volumes of the gases remaining, at the original temperature and pressure? oxygen/cm3
carbon monoxide/cm3
carbon dioxide/cm3
A
0
0
20
B
0
0
40
C
10
0
20
D
10
10
20
12 Aqueous copper(II) sulphate is electrolysed using copper electrodes. Which equation represents the reaction taking place at the anode (positive electrode)? A
Cu(s) → Cu2+(aq) + 2e−
B
Cu2+(aq) + 2e− → Cu(s)
C
4OH−(aq) → 2H2O(l) + O2(g) + 4e−
D
2H+(aq) + 2e− → H2(g)
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6 13 Element X is X is extracted by the electrolysis of a molten compound of elements X and X and Y . The electrode reactions are as shown. at the cathode
at the anode
X 2+ + 2e− → X
2Y 2− − 4e− → Y 2
Which of the following could be the compound? A
aluminium oxide
B
calcium chloride
C
magnesium oxide
D
potassium chloride
14 In which circuit does the bulb light up?
key A
Cu
B
CuSO4(aq)
Cu
Ag
NaCl(s)
= bulb
C
Zn
Cu
C2H5OH(I)
D
Zn
Ag
H2SO4(aq)
Cu
15 Nitrogen and hydrogen react in a closed vessel. N2(g) + 3H2(g)
2NH3(g)
How do the speeds of the forward and reverse reactions change, if the pressure in the vessel is increased but the temperature is kept constant? speed speed of forw forwar ard d reac reacti tion on A
increases
B
does not change
C
decreases
D
decreases
spee speed d of of rev rever erse se reac reacti tion on increases does not change increases does not change
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7 16 Solution X turns acidified potassium dichromate(VI) from orange to green. What must solution X contain? A
an alkali
B
an ammonium salt
C
an oxidising agent
D
a reducing agent
17 The manufacture of sulphuric acid by the Contact process can be represented as follows. S → SO2 → SO3 → H2SO4 Which diagram shows the oxidation state (oxidation number) of sulphur at each stage of the process? A
B
8 7 6 oxidation 5 4 state 3 2 1 0
C
D 8 7 6 5 4 3 2 1 0
18 Which of the following compounds dissolves in water to give a solution with a pH greater than 7? A
calcium carbonate
B
copper(II) hydroxide
C
sodium hydroxide
D
sulphur dioxide
19 Which words in the table complete the following description of the preparation of copper(II) sulphate? An excess of copper(II) oxide was added to dilute sulphuric acid. The mixture was ——-1—— to remove the excess of oxide. The solution was ——2—— to half its volume and then cooled, so that it ——-3—— . 1
2
A
distilled
evaporated
B
distilled
C
filtered
condensed
crystallised
D
filtered
evaporated
crystallised
filtered
3 crystallised evaporated
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8 20 Which statement about a bout groups in the Periodic Table Table is correct? A
All groups contain both metals and non-metals.
B
Atoms of elements in the same group have the same total number of electrons.
C
In Group l, reactivity decreases decrea ses with increasing proton (atomic) (at omic) number.
D
In Group VII, the melting point of the elements increases with proton (atomic) number.
21 Element Q has Q has a melting point greater than 1000 °C. It has oxidation oxidation states (oxidation numbers) of +2 and +3 in its compounds. These compounds are coloured. In which position p osition of the Periodic Table Table shown is Q found? Q found?
A D B
C
22 The table gives the formulae of the catalysts used in some industrial processes. process
catalyst
Haber process
Fe + Mo
Contact process
V2O5
cracking of alkanes
Al2O3 + SiO2
polymerisation of of et ethene
Al(C2H5)3 + TiCl4
manufacture of silicones
CuCl
How many different transition metals are included (as elements or as compounds) in the list of catalysts? A
3
B
4
C
D
5
6
23 Which oxide can be reduced to its metal by heating in a stream of hydrogen gas? A
aluminium oxide
B
copper(II) oxide
C
magnesium oxide
D
sodium oxide
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9 24 When heated, solid X gives off a gas ga s which turns tur ns limewater milky. milky. The residue reacts with dilute acid and also with aqueous alkali. What is X? A
copper(II) carbonate
B
magnesium carbonate
C
sodium carbonate
D
zinc carbonate
25 The table shows the results of adding weighed pieces of iron to solutions M and S. solution us used
initial mass of iron /g /g
mass of ir iron af after 15 mi minutes /g
M
5
4
S
5
4
What could the aqueous solutions M and S have been? M
S
A
copper(II) sulphate
B
iron(II) chloride
C
dilute ute hydrochl ochlo oric ric acid
D
magnesium chloride
silver nitrate calcium chloride sod odiium chlorid ride dilute sulphuric acid
26 Hydrogen can be manufactured from methane using a nickel n ickel catalyst. methane X
nickel catalyst
hydrogen Y
What are X and Y? X
Y
A
oxygen
oxides of carbon
B
nitrogen
C
steam
oxides of carbon
D
steam
ethene
ammonia
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10 27 An element is burned in an excess of oxygen. Which statement about the oxide formed is always correct? A
It is a crystalline solid.
B
It is greater in mass than the element.
C
It is soluble in water.
D
It is white in colour.
28 An element X , necessary for plant growth, can be added to the soil only in the form of compounds which contain the ion X +. What is X ? X ? A
hydrogen
B
nitrogen
C
phosphorus
D
potassium
29 What is the concentration of hydrogen ions in 0.05 mol/dm3 sulphuric acid? A
0.025 0.02 5 g/dm3
B
0.05 g/d g/dm m3
C
0.10 g/dm3
D
2.0 2.0 g/d g/dm m3
30 Which ions are discharged when concentrated aqueous sodium chloride is electrolysed? A
chloride and hydroxide ions
B
chloride and hydrogen ions
C
hydrogen and sodium ions
D
hydroxide and sodium ions
31 Carbon and silicon are in the same group of the Periodic Table. Table. What is the formula of sodium silicate? A
NaSiO2
B
NaSiO3
C
Na2SiO3
D
Na2SiO4
32 Which statement shows that diamond and graphite are allotropes of carbon? A
Both have giant molecular structures.
B
Complete combustion of equal masses of each produces equal masses of carbon dioxide as the only product.
C
Graphite conducts electricity, whereas diamond does not.
D
Under suitable conditions, graphite can be converted into diamond. 5070/1 W99
11 33 Which calcium compound does not increase the pH of acidic soils? A
calcium carbonate
B
calcium hydroxide
C
calcium oxide
D
calcium sulphate
34 Which compound, on combustion, never forms forms soot? A
carbon monoxide
B
ethanol
C
ethene
D
methane
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12 35 The molecular structure of o f a hydrocarbon is shown below. H H H
C
H
H
C
C
H
H
C
H H
H Which structure is an isomer of this hydrocarbon? A
B H
H H
H
H H
C
H
C
C
C
H
C
H H
H
H
H
H
C
C
C
C
H H
H H
H
H H
H
C
H
D
H
H
H
H
H
C
C
C
C
C
H
H
H
H
H
H H
H
C
H
H
C
C
H
H
C
H
H
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13 36 Octane is an alkane present in petrol. What are the products when octane is completely burned in air? A
carbon dioxide and hydrogen
B
carbon dioxide and water
C
carbon monoxide and water
D
carbon monoxide, carbon dioxide and water
37 Which type of reaction occurs when soap is formed from fats? A
hydrolysis
B
polymerisation
C
fermentation
D
substitution
38 Which of these equations does not represent an addition reaction? A
CH2Cl2 + Cl2 → CHCl3 + HCl
B
C2H4 + Br2 → C2H4Br2
C
n C n C2H4 → ( CH2 − CH2 ) n
D
C3H6 + H2O → C3H7OH
39 A polymer has the structure shown. CH2
CH
CH2
CH3
CH
CH2
CH3
CH CH3
What is the molecular formula of the monomer? A
C2H4
B
C2H6
C
C3H6
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D
C3H8
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14 40 What is the linkage between the units in fats and also in Terylene ? O A
C
O
H B
C
O
H
C
D
O
H
C
N
H
H
C
C
H
H
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15 BLANK PAGE
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