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WorksheetsCambridge AS Chemistry 9701 w14 12
Total questions: 39
Worksheet time: 49mins
Name
Class
Date
1.
In which reaction does hydrogen behave as an oxidising agent?
a)
H2 + Cl2 → 2HCl
b)
C2H4 + H2 → C2H6
c)
N2 + 3H2 → 2NH3
d)
2Na + H2 → 2NaH
2.
Ethanol is increasingly being used as a fuel for cars.
The standard enthalpy change of formation of carbon dioxide is –393 kJ mol–1.
The standard enthalpy change of formation of water is –286 kJ mol–1.
The standard enthalpy change of formation of ethanol is –277 kJ mol–1.
What is the standard enthalpy change of combustion of ethanol?
The standard enthalpy change of formation of carbon dioxide is –393 kJ mol–1.
The standard enthalpy change of formation of water is –286 kJ mol–1.
The standard enthalpy change of formation of ethanol is –277 kJ mol–1.
What is the standard enthalpy change of combustion of ethanol?
a)
-1921 kJ mol–1
b)
-1367 kJ mol–1
c)
-956 kJ mol–1
d)
-402 kJ mol–1
3.
Which solid-line curve most accurately represents the distribution of molecular energies in a gas
at 500 K if the dotted-line curve represents the corresponding distribution for the same gas at
300 K?
at 500 K if the dotted-line curve represents the corresponding distribution for the same gas at
300 K?
a)
A
b)
B
c)
C
d)
D
4.
Two glass vessels M and N are connected by a closed valve.
M contains helium at 20 °C at a pressure of 1 × 105
Pa. N has been evacuated, and has three
times the volume of M. In an experiment, the valve is opened and the temperature of the whole
apparatus is raised to 100 °C.
What is the final pressure in the system?
M contains helium at 20 °C at a pressure of 1 × 105
Pa. N has been evacuated, and has three
times the volume of M. In an experiment, the valve is opened and the temperature of the whole
apparatus is raised to 100 °C.
What is the final pressure in the system?
a)
3.18 × 104Pa
b)
4.24 × 104Pa
c)
1.25 × 104Pa
d)
5.09 × 104Pa
5.
Question on image
a)
A
b)
B
c)
C
d)
D
6.
Aluminium carbide, Al 4C3, reacts readily with aqueous sodium hydroxide. The two products of the
reaction are NaAlO2 and a hydrocarbon. Water molecules are also involved as reactants.
What is the formula of the hydrocarbon?
reaction are NaAlO2 and a hydrocarbon. Water molecules are also involved as reactants.
What is the formula of the hydrocarbon?
a)
CH4
b)
C2H6
c)
C3H8
d)
C6H12
7.
In an experiment to calculate the enthalpy change of combustion of a fuel, 1.5 g (0.0326 mol) of the fuel was used to heat 200 g of water. The temperature of the water rose from 25 °C to 55 °C. The specific heat capacity of water is 4.18 J g–1 K–1.
There is significant heat loss in this experiment. Therefore, the experimental value for the enthalpy change of combustion, ΔHc, of the fuel will be different from the theoretical value.
Using the information above, what is the experimental value for the enthalpy change of combustion, ΔHc, of the fuel?
There is significant heat loss in this experiment. Therefore, the experimental value for the enthalpy change of combustion, ΔHc, of the fuel will be different from the theoretical value.
Using the information above, what is the experimental value for the enthalpy change of combustion, ΔHc, of the fuel?
a)
–1410 kJ mol–1
b)
-769 kJ mol–1
c)
-30.7 kJ mol–1
d)
-16.7 kJ mol–1
8.
The reaction pathway diagram below illustrates the energies of the reactants, the products and the transition state of a reaction.
Which expression represents the activation energy of the forward reaction?
Which expression represents the activation energy of the forward reaction?
a)
E1-E2
b)
E2-E1
c)
E2-E3
d)
E3-E2
9.
Methylpropan-1-ol and butan-1-ol are structural isomers. Methylpropan-1-ol has a lower boiling point.
Which statement explains why the boiling point of methylpropan-1-ol is lower than that of butan-1-ol?
Which statement explains why the boiling point of methylpropan-1-ol is lower than that of butan-1-ol?
a)
Methylpropan-1-ol cannot form hydrogen bonds.
b)
Methylpropan-1-ol has weaker covalent bonds than butan-1-ol.
c)
Methylpropan-1-ol has weaker van der Waals’ forces than butan-1-ol.
d)
Methylpropan-1-ol molecules have more surface area than butan-1-ol molecules.
10.
For which equation is the enthalpy change correctly described as an enthalpy change of formation?
a)
C(g) + O2(g) → CO2(g)
b)
C(s) + 1/2 O2(g) → CO(g)
c)
2N(g) + 4O(g) → N2O4(g)
d)
2NO(g) + O2(g) → 2NO2(g)
11.
Element X, in Period 3, has the following properties.
● Its oxide has a giant structure.
● It forms covalent bonds with chlorine.
● Its oxide will neutralise HCl (aq).
What is element X?
● Its oxide has a giant structure.
● It forms covalent bonds with chlorine.
● Its oxide will neutralise HCl (aq).
What is element X?
a)
Mg
b)
Al
c)
Si
d)
P
12.
Which property is not associated with the element sodium?
a)
It can react with cold water to form hydrogen.
b)
It forms a basic oxide.
c)
It forms a neutral chloride.
d)
It is an oxidising agent.
13.
Use of the Data Booklet is relevant to this question.
Sir Humphrey Davy discovered boron, calcium, magnesium and sodium.
Which of these elements has the second smallest atomic radius in its group and the third lowest first ionisation energy in its period?
Sir Humphrey Davy discovered boron, calcium, magnesium and sodium.
Which of these elements has the second smallest atomic radius in its group and the third lowest first ionisation energy in its period?
a)
boron
b)
calcium
c)
magnesium
d)
sodium
14.
Use of the Data Booklet is relevant to this question.
A sample of potassium oxide, K2O, is dissolved in 250 cm3 of distilled water. 25.0 cm3 of this solution is titrated against sulfuric acid of concentration 2.00 mol dm–3. 15.0 cm3 of this sulfuric acid is needed for complete neutralisation.
Which mass of potassium oxide was originally dissolved in 250 cm3 of distilled water?
A sample of potassium oxide, K2O, is dissolved in 250 cm3 of distilled water. 25.0 cm3 of this solution is titrated against sulfuric acid of concentration 2.00 mol dm–3. 15.0 cm3 of this sulfuric acid is needed for complete neutralisation.
Which mass of potassium oxide was originally dissolved in 250 cm3 of distilled water?
a)
2.83g
b)
28.3g
c)
47.1 g
d)
56.6 g
15.
Chlorine gas reacts with cold aqueous sodium hydroxide. It can also react with hot aqueous sodium hydroxide.
What are the oxidation numbers of chlorine in the products of these reactions?
What are the oxidation numbers of chlorine in the products of these reactions?
a)
A
b)
B
c)
C
d)
D
16.
Under standard conditions, which statement is correct?
a)
Cl–(aq) can oxidise Br2(aq).
b)
Cl–(aq) can reduce Br2(aq).
c)
Cl 2(aq) can oxidise Br–(aq).
d)
Cl 2(aq) can reduce Br–(aq).
17.
Total removal of the pollutant sulfur dioxide, SO2, is difficult. The quantities emitted from furnace chimneys can be lowered by using desulfurisation plants. The gases are reacted with calcium hydroxide to remove the SO2.
What is the main product formed initially?
What is the main product formed initially?
a)
Ca(HSO4)2
b)
CaS
c)
CaSO3
d)
CaSO4
18.
Which oxide does not react with cold dilute sodium hydroxide to produce a salt?
a)
Al2O3
b)
P4O10
c)
SO2
d)
SiO2
19.
Which row correctly describes the reaction between propene and bromine, Br2(l)?
a)
A
b)
B
c)
C
d)
D
20.
Use of the Data Booklet is relevant to this question.
Which compound has an Mr of 84 and will react with HBr to give a product with an Mr of 164.9?
Which compound has an Mr of 84 and will react with HBr to give a product with an Mr of 164.9?
a)
A
b)
B
c)
C
d)
D
21.
1,1-dichloropropane reacts with aqueous sodium hydroxide in a series of steps to give propanal.
Which term describes the first step of this reaction?
Which term describes the first step of this reaction?
a)
addition
b)
elimination
c)
oxidation
d)
substitution
22.
Considering only structural isomers, what is the number of alcohols of each type with the formula
C5H12O?
C5H12O?
a)
A
b)
B
c)
C
d)
D
23.
Lactic acid, CH3CH(OH)CO2H, causes pain when it builds up in muscles.
Which reagent reacts with both of the –OH groups in lactic acid?
Which reagent reacts with both of the –OH groups in lactic acid?
a)
acidified potassium dichromate(VI)
b)
ethanol
c)
sodium
d)
sodium hydroxide
24.
In the hydrolysis of bromoethane by aqueous sodium hydroxide, what is the nature of the
attacking group and of the leaving group?
attacking group and of the leaving group?
a)
A
b)
B
c)
C
d)
D
25.
Corticosterone is a hormone involved in the metabolism of carbohydrates and proteins.
How many chiral centres are there in one molecule of corticosterone?
How many chiral centres are there in one molecule of corticosterone?
a)
5
b)
6
c)
7
d)
8
26.
Methyl methylpropenoate is the monomer used to make Perspex.
Which diagram correctly shows methyl methylpropenoate?
Which diagram correctly shows methyl methylpropenoate?
a)
A
b)
B
c)
C
d)
D
27.
The ester CH3CH2CH2CO2CH3 is responsible for the aroma of apples.
When this ester is hydrolysed by acid in the stomach, what is the empirical formula of the organic
acid produced?
When this ester is hydrolysed by acid in the stomach, what is the empirical formula of the organic
acid produced?
a)
CH2O
b)
CH4O
c)
C2H4O
d)
C3H6O2
28.
Which equation correctly represents the balanced equation for the complete combustion of a
hydrocarbon with the formula CxHy?
hydrocarbon with the formula CxHy?
a)
CxHy + (x + y/2 )O2 → xCO2 + y/2 H2O
b)
CxHy + (x + y/4 )O2 → xCO2 + yH2O
c)
CxHy + (x + y/4 )O2 → xCO2 + y/4 H2O
d)
CxHy + (x + y/4 )O2 → xCO2 + y/2 H2O
29.
β-carotene is responsible for the orange colour of carrots.
β-carotene is oxidised by hot, concentrated, acidified KMnO4.
When an individual molecule of β-carotene is oxidised in this way, many product molecules are formed.
How many of these product molecules contain a ketone functional group?
β-carotene is oxidised by hot, concentrated, acidified KMnO4.
When an individual molecule of β-carotene is oxidised in this way, many product molecules are formed.
How many of these product molecules contain a ketone functional group?
a)
4
b)
6
c)
9
d)
11
30.
Use of the Data Booklet is relevant to this question.
Which ions contain one or more unpaired electrons?
1 Cu2+
2 Mn3+
3 V3+
Which ions contain one or more unpaired electrons?
1 Cu2+
2 Mn3+
3 V3+
a)
1, 2 and 3
are correct
are correct
b)
1 and 2
only are correct
only are correct
c)
2 and 3
only are correct
only are correct
d)
1 only
is correct
is correct
31.
Use of the Data Booklet is relevant to this question.
The bond energy of the Br – O bond is 235 kJ mol-1.
Which reactions are exothermic?
1 OH• + HBr → H2 + BrO•
2 OH• + HBr → H2O + Br•
3 H• + HBr → H2 + Br•
The bond energy of the Br – O bond is 235 kJ mol-1.
Which reactions are exothermic?
1 OH• + HBr → H2 + BrO•
2 OH• + HBr → H2O + Br•
3 H• + HBr → H2 + Br•
a)
1, 2 and 3
are correct
are correct
b)
1 and 2
only are correct
only are correct
c)
2 and 3
only are correct
only are correct
d)
1 only
is correct
is correct
32.
A reversible reaction is catalysed.
Which statements about the effects of the catalyst on this system are correct?
1 The catalyst alters the mechanism of the reaction.
2 The catalyst reduces the activation energy for both the forward and the backward reaction.
3 The catalyst alters the composition of the equilibrium mixture.
Which statements about the effects of the catalyst on this system are correct?
1 The catalyst alters the mechanism of the reaction.
2 The catalyst reduces the activation energy for both the forward and the backward reaction.
3 The catalyst alters the composition of the equilibrium mixture.
a)
1, 2 and 3
are correct
are correct
b)
1 and 2
only are correct
only are correct
c)
2 and 3
only are correct
only are correct
d)
1 only
is correct
is correct
33.
A student borrowed a friend’s chemistry notes and copied out the notes in the box below.
Which statements are correct?
Which statements are correct?
a)
1, 2 and 3
are correct
are correct
b)
1 and 2
only are correct
only are correct
c)
2 and 3
only are correct
only are correct
d)
1 only
is correct
is correct
34.
On being heated, hydrogen iodide breaks down more quickly than hydrogen chloride.
Which statements explain this faster rate?
1 The HI bond is weaker than the HCl bond.
2 The reaction of the breakdown of HI has a smaller activation energy than that of HCl.
3 The breakdown of HI is more exothermic than that of HCl.
Which statements explain this faster rate?
1 The HI bond is weaker than the HCl bond.
2 The reaction of the breakdown of HI has a smaller activation energy than that of HCl.
3 The breakdown of HI is more exothermic than that of HCl.
a)
1, 2 and 3
are correct
are correct
b)
1 and 2
only are correct
only are correct
c)
2 and 3
only are correct
only are correct
d)
1 only
is correct
is correct
35.
Which statements about calcium oxide are correct?
1 It reacts with cold water.
2 It is produced when calcium nitrate is heated.
3 It can be reduced by heating with magnesium.
1 It reacts with cold water.
2 It is produced when calcium nitrate is heated.
3 It can be reduced by heating with magnesium.
a)
1, 2 and 3
are correct
are correct
b)
1 and 2
only are correct
only are correct
c)
2 and 3
only are correct
only are correct
d)
1 only
is correct
is correct
36.
Propanal will react with hydrogen cyanide to form 2-hydroxybutanenitrile. A suitable catalyst for
this reaction is sodium cyanide.
Which statements about the reaction of propanal with hydrogen cyanide are correct?
1 The CN– ion attacks the propanal molecule to form an intermediate ion.
2 The product of the reaction has a chiral carbon atom.
3 The CN– ion is a stronger electrophile than the HCN molecule.
this reaction is sodium cyanide.
Which statements about the reaction of propanal with hydrogen cyanide are correct?
1 The CN– ion attacks the propanal molecule to form an intermediate ion.
2 The product of the reaction has a chiral carbon atom.
3 The CN– ion is a stronger electrophile than the HCN molecule.
a)
1, 2 and 3
are correct
are correct
b)
1 and 2
only are correct
only are correct
c)
2 and 3
only are correct
only are correct
d)
1 only
is correct
is correct
37.
X is an organic compound that gives a precipitate with aqueous silver nitrate. This precipitate remains undissolved when concentrated aqueous ammonia is added.
What is a possible identity for X?
1) iodomethane
2) 2-bromobutane
3) 2-chlorobutane
What is a possible identity for X?
1) iodomethane
2) 2-bromobutane
3) 2-chlorobutane
a)
1, 2 and 3
are correct
are correct
b)
1 and 2
only are correct
only are correct
c)
2 and 3
only are correct
only are correct
d)
1 only
is correct
is correct
38.
For which mixtures of reagents are the colour changes described correctly?
a)
1, 2 and 3
are correct
are correct
b)
1 and 2
only are correct
only are correct
c)
2 and 3
only are correct
only are correct
d)
1 only
is correct
is correct
39.
A reaction pathway diagram is shown.
Which reactions would have this profile?
1) (CH3)3CBr + NaOH (CH3)3COH + NaBr ->
2) CH3CH2Br + NaOH -> CH3CH2OH + NaBr
3) (CH3)3CCH2CH2Cl + 2NH3 -> (CH3)3CCH2CH2NH2 + NH4Cl
Which reactions would have this profile?
1) (CH3)3CBr + NaOH (CH3)3COH + NaBr ->
2) CH3CH2Br + NaOH -> CH3CH2OH + NaBr
3) (CH3)3CCH2CH2Cl + 2NH3 -> (CH3)3CCH2CH2NH2 + NH4Cl
a)
1, 2 and 3
are correct
are correct
b)
1 and 2
only are correct
only are correct
c)
2 and 3
only are correct
only are correct
d)
1 only
is correct
is correct
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