LAE Chemistry Y12 Summer Assessment Paper 2 - Modules 124 Final
LAE Chemistry Y12 Summer Assessment Paper 2 - Modules 124 Final
LAE Chemistry Y12 Summer Assessment Paper 2 - Modules 124 Final
INSTRUCTIONS
• Use black ink. You may use an HB pencil for graphs and diagrams.
• Complete the boxes above with your Centre number and candidate number.
• Answer all the questions.
• Write your answer to each question in the space provided.
• Additional paper may be used if required but you must clearly show your
candidate number, Centre number and question number(s).
INFORMATION
• The total mark for this paper is 70
• The marks for each question are shown in brackets [ ].
• This document consists of 21 pages.
Section A
You should spend a maximum of 15 minutes on this section. Circle the letter next to the correct answer.
(1) How many electrons are used to form the -bonds in a molecule of ethene?
ethene
A. 1
B. 2
C. 8
D. 10
A. An alicyclic aldehyde
B. An aromatic aldehyde
C. An alicyclic ketone
D. An aromatic ketone
2
(3) Which of the following pairs are cis-trans isomers?
A. 1 and 2
B. 1 and 4
C. 2 and 3
D. 3 and 4
(4) While carrying out a titration, a student recorded the following data.
Trial Experiment
1 2 3
Final volume / cm3 24.30 47.95 71.80 24.75
A. 23.90
B. 23.80
C. 23.70
D. 23.60
(6)
3
Which are the correct names for both SO2 and Na2SO4?
4
(7) What is the percentage by mass of nitrogen in ammonium nitrate, NH4NO3?
[Molar masses / gmol-1: N = 14.0; H = 1.0; O = 16.0]
A. 14.0%
B. 17.5%
C. 28.0%
D. 35.0%
A. SF4
B. NH4+
C. XeF4
D. AlH4-
(9)
5
Which of the alcohols are classified as primary?
A. alcohol P only
B. alcohols P and R only
C. alcohols P, R and S only
D. alcohol P, Q, R and S
(10) How many moles of oxygen are required for complete combustion of exactly one mole of
pentan-1-ol, C5H12O?
A. 7.0
B. 7.5
C. 8.0
D. 8.5
Section B
(11) Compound A is an unsaturated hydrocarbon used as the starting material for the production of
6
compound A
……………………………………………………………………….…………………………………………………………..[1]
…………………………………………………………………………………………………………..[1]
(i) In the boxes below, show the structures of the organic products formed in the reactions.
H2/Ni
Br2
compound A
H2O
mixture of isomers
[4]
(ii) What are the essential conditions for the reaction of compound A with H2O?
……………………………………………………………………………………………………………………..……………..[2]
7
(iii) Using curly arrows, outline the mechanism for the reaction of compound A with Br2.
[3]
(12) Some airbags in cars contain sodium azide (NaN3). Sodium azide is an ionic compound, formed
from Na+ ions and azide ions. The azide ion has the formula N3-
8
(a) Sodium azide is made by reacting dinitrogen monoxide gas with sodium amide (NaNH2) as
shown by the equation.
Calculate the mass of sodium amide needed to obtain 550 g of sodium azide, assuming there is a
95.0% yield of sodium azide.
………………………………………………………………………………………………………………………………………..…
…………………………………………………………………………………………………………………………………….......
………………………………………………………………………………………………………………………………………..…
…………………………………………………………………………………………………………………………………….......
………………………………………………………………………………………………………………………………………..…
…………………………………………………………………………………………………………………………………….......
………………………………………………………………………………………………………………………………………..…
…………………………………………………………………………………………………………………………………….......
………………………………………………………………………………………………………………………………………..…
…………………………………………………………………………………………………………………………………….......
………………………………………………………………………………………………………………………………………..…
……………………………………………………………………………………………………………………………………...[5]
(b) If a car is involved in a serious collision, the sodium azide decomposes to form sodium and
nitrogen as shown in the equation.
………………………………………………………………………………………………………………………………………..…
…………………………………………………………………………………………………………………………………….......
………………………………………………………………………………………………………………………………………..…
…………………………………………………………………………………………………………………………………….......
………………………………………………………………………………………………………………………………………..…
…………………………………………………………………………………………………………………………………….......
………………………………………………………………………………………………………………………………………..…
…………………………………………………………………………………………………………………………………….......
………………………………………………………………………………………………………………………………………..…
…………………………………………………………………………………………………………………………………….......
………………………………………………………………………………………………………………………………………..…
……………………………………………………………………………………………………………………………………...[3]
(c)* Sodium azide can be manufactured from sodium hydroxide and ammonia. The reaction is very
sensitive to the concentration of sodium hydroxide.
The sodium hydroxide required for this reaction is usually prepared as a standard solution. A
standard solution is a solution of a precise concentration - as used in laboratory titrations.
10
A chemist needs to prepare 250cm3 of a standard solution of sodium hydroxide, NaOH, with a
concentration of 1.50 moldm-3. He has access to solid sodium hydroxide and ordinary laboratory
apparatus.
Describe the procedure he should follow to prepare the standard solution. Include a calculation in
your answer.
………………………………………………………………………………………………………………………………………..…
…………………………………………………………………………………………………………………………………….......
………………………………………………………………………………………………………………………………………..…
…………………………………………………………………………………………………………………………………….......
………………………………………………………………………………………………………………………………………..…
…………………………………………………………………………………………………………………………………….......
………………………………………………………………………………………………………………………………………..…
…………………………………………………………………………………………………………………………………….......
………………………………………………………………………………………………………………………………………..…
………………………………………………………………………………………………………………………………………..…
………………………………………………………………………………………………………………………………………..…
……………………………………………………………………………………………………………………………………...[3]
On the following diagram, draw an arrowhead on one of the bonds to represent the
direction of donation of the lone pair in the dative bond.
11
[1]
[1]
12
(i) The empirical formula of the alkene is CH2.
Use the empirical formula and the mass spectrum to confirm the molecular
formula as C7H14.
………………………………………………………………………………………………………………………
………………………………………………………………………………………………………………………
………………………………………………………………………………………………………………………
………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………… [1]
Suggest possible structures for the species responsible for the labelled peaks I
and II in the mass spectrum of hept-3-ene
peak I peak II
[3]
13
(b) Hept-3-ene shows E/Z isomerism.
E-hept-3-ene Z-hept-3-ene
[2]
ii. State and explain the features of a hept-3-ene molecule that lead to E and Z
isomers.
………………………………………………………………………………………………………………………………..…………………………
………………………………………………………………………………………………………………………………...…………………………
……………………………………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………………………………
………………………………….……………………………………………………………………………………………………………………… [2]
(c) A section of polymer that can be made from an unsaturated hydrocarbon B is shown
below.
14
i. Add brackets to the section of polymer to show one repeat unit. [1]
[1]
Calculate the number of monomer molecules required to make one molecule of the
polymer.
15
Turn over for Question 14
16
(a) Why is propan-2-ol classified as a secondary alcohol?
……………………………………………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………………………………[1]
explanation…………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………………………………[4]
17
……………………………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………………………………[1]
A student plans to carry out this oxidation using the apparatus shown in the diagram.
(i)
propan-2-ol propanone
18
The boiling points of propan-2-ol and propanone are shown in the table.
Propan-2-ol Propanone
………………………………………………………………………………………………………………….……………………
……………………………………………………………………………………………………………………………………….
………………………………………………………………………………………………………………….……………………
……………………………………………………………………………………………………………………………………….
………………………………………………………………………………………………………………………………..… [2]
19
(15)
[5]
20
*
21
(16)
(a)
(b)