AS CHEMISTRY Paper 2 June 2021 - Organic and Physical Chemistry

AS CHEMISTRY Paper 2 Organic and Physical Chemistry JUNE 2021 AS CHEMISTRY Paper 2 Organic and Physical Chemistry JUNE 2021

Please write clearly in block capitals.

Centre

number

Candidate

number

Surname

Forename(s)

Candidate

signatu

re

*JUN217404201*

IB/M/Jun21/ 7404/2

E7

 AqACHEMISTRY2021

AS

CHEMISTRY

Paper 2 Organic and Physical

Chemistry

JUNE 2021

Time allowed: 1 hour 30 minutes

Materials

For this paper you must have:

 the Periodic Table/Data Sheet, provided as an insert (enclosed)

 a ruler with millimetre measurements

 a scientific calculator, which you are expected to use where appropriate.

Instructions

 Use black ink or black ball-point pen.

 Fill in the boxes at the top of this page.

 Answer all questions.

 You must answer the questions in the spaces provided. Do not

write outside the box around each page or on blank pages.

 If you need extra space for your answer(s), use the lined pages at

the end of this book. Write the question number against your

answer(s).

 All working must be shown.

 Do all rough work in this book. Cross through any work

you do not want to be marked.

Information

 The marks for questions are shown in brackets.

 The maximum mark for this paper is 80.

Advice

You are advised to spend about 65 minutes on Section A and 25 minutes on Section B.

For Examiner’s Use

Question Mark

1

2

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Section

B

TOTAL

2

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There are no questions printed on this page

DO NOT WRITE ON THIS PAGE

ANSWER IN THE SPACES PROVIDED

box

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Section A

Answer all questions in this

section.

box

Figure 1 shows the Maxwell–Boltzmann distribution of molecular energies in a

sample of gas.

Figure 1

. Label the y-axis on Figure 1.

[1 mark]

. State why the curve starts at the origin.

[1 mark]

. State what X indicates on Figure 1.

[1 mark]

X indicates

. Half of the gas molecules in the sample are removed.

The remaining gas molecules are kept at the same temperature.

Draw the new distribution of molecular energies for the remaining gas on Figure 1.

[2 marks] 5

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