2023_chem_alevel_mj_paper2

Extracted Content: 2023_chem_alevel_mj_paper2

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CandidateName- —— —— — — — Centre Number Candidate Number

EE eS ye PR

©

Fee Pepemence Meare

ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Advanced Level

Kin

CHEMISTRY 6031/2
PAPER 2

JUNE 2023 SESSION 1 hour 30 minutes

Candidates answer on the question paper.
Additional materials:
Data Booklet
Electronic Calculator

TIME 1 hour 30 minutes
INSTRUCTIONS TO CANDIDATES

Write your name, centre number and candidate number in
the spaces at the top of this page.

FOR EXAMINER’S USE

Answer all questions.
Write your answers in the spaces provided on the question
paper.

INFORMATION FOR CANDIDATES
The number of marks is given in brackets [ ] at the end of
each question or part question.

This question paper consists of 12 printed pages.

Copyright: Zimbabwe School Examinations Council, J2023.
©ZIMSEC J2023

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an 2 Answer all questions ; @) @ State any two assumptions of the Kinetic theory of gases.

1,
rere —>0$@
—

2.

——

COT

(ii) A volume of 46.00 cm? of vapour was produced when 0.16 gofa
liquid, Y, was vapourised at a temperature of 100 °C anda pressure
of 1,02 x 105 Pa,

Calculate the relative molecular mass of Y.

(iii) Describe the afrangement of particles in Y,

TT
—_—_—_.So
ef) |

6031/2 12023 zimse
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3 (b) Hydrogen bromide decomposes according to the equation: F ZHBrig * Hog + Brac, U Table 1 shows results of the decomposition of HBr. Table 1 HBr 0.40 Br> 0.03 H 0.03 (ji) Write the K,, expression for the equilibrium reaction. (ii) Calculate Ky for decomposition of hydrogen bromide. (ili) Deduce the effect of increasing temperature on the Position of the equilibrium. [5] [Total:10] 6031/2 32023 [Turn over

ON A

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(b)

i s?-,
(i) Give the electronic configuration of

ee

(ii) Describe the shapes of the s and p orbitals.
soe

a nT

Gii) The chemical equation for the reaction of tin and nitric acid is
shown:

Sn+ 4HNO; > SnO, + 4NO, + 2H,0

Explain using changes in oxidation states the reaction occurring in
nitrogen,

ty
[5]
eee

A standard cell was set up using sodium iodide and hydrogen peroxide,

(1) State the type of electrodes appropriate for the reaction.

__

(ii) Write the half equations and the overall equation for the cell.

sn
te

(iii) Predict the feasibility of the Teaction,

I [5]

(Total: 10]

603172 32023

SON orient

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3 (a) Explain why Examine

. Use
(1) NaCl is a solid whereas SCI, is a liquid at room temperature,

(i) first ionisation energy of Mg is higher than that of Al,

Gili) SiO is insoluble in water.

[6]

(b) Write balanced chemical equations for the four steps of the contact process.

1.
2.
3.
4. {4]
[Total:10]
603172 12023
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IAN

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“af

(a) Methylbenzene reacts as shown in Figure 4.1.

CH, Cl
we va

Use
AH KM, Ht /KMnO, aC I
<x

Fig. 4.1
(i)

Draw the structure of the organic product A.

(ii) State the reagents and conditions for step 1,

reagents

——

conditions

ss

(iii) State the observation made when methylbenzene reacts with
bromine in the presence of FeBrs.

6031/2 12023

© Zimsec 2023
AO

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7 For iv Give t . oo f m™ he structure of the organic product for the reaction in (iii). = [5] ob) = @ Outline the formation of butan-2-one from an alcohol. (ii) Describe a chemical test for the carbonyl group in butan-2-one. test observation (iii) | Draw the structure of the product for the reaction in (ii). [5]

[Total:10]

31/2 32023
= [Turn over

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(a) —_ Explain why butane a @ does not react with aqueous bromine, Be

(ii) is insoluble in water,

Git) has a lower melting point than hexane.

[3]
(b) Describe any two environmental effects of the use of alkanes as fuels.
1.
2.
(2]
GIN Parts
«c \ Zimsec 2023

ALIN

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_— a

9
©) The structures of compounds X and Y are shown in Figure 5.1. i
xX Y Use
1
HO —O)- CH,CH,OH HO <O)- C—CH,
Fig. 5.1

Complete Table 5.1. by

(i) stating the observable changes that occur,

(ii) giving the structure(s) of the organic products formed when X and Y react

with sodium metal.

Table 5.1.

observation

structure of
organic product

Name one reagent that can be used to distinguish between

iii
” compound X and compound Y.

[5]

[Total:10]

6031/2 32023

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=

CUA CA

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10

k
(i) Identify two applications of nanoparticles.
Gi) Give two examples of nanoparticles,
[5]
NF I2935 :
Im Que

Tr

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= 11

For
. i Exam i 1

) @ A mixture of three amino acids shown in Figure 6.1 were separated using Use

electrophoresis buffered at pH 7.
COOH
H CH, 7

| | |
H,N-C—COOH H,N—C—COOH — H,N-(CH,);—C— COOH
|

|

H H NH,
glycine aspartic lysine
acid
Fig. 6.1

Results obtained with electrophoresis are shown in Fig. 6.2.

Q| | | |©

A B Cc
Fig. 6.2

Identify, with reasons, amino acid at A.

1. amino acid

2. reason

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For

(iii) State the overall charge of 0 zwitterion. Bxaminer'y
Use
Se
(iii) Write the formula of the peptide formed when glycine reacts with
aspartic acid.
(iv) Name the type of reaction between the two amino acids.
[5]
[Total:10]

ny

sc 3804
©) Zimsec 2023
VMI €

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