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COMBINED SCIENCE B

OCR 2024
GCSE Combined Science B Twenty First Century Science
J260/02: Chemistry (Foundation Tier)

with Marking Scheme Merged
...
Do not write in the barcodes
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You can use an HB pencil, but only for graphs and diagrams
...
If you need extra space use the
lined pages at the end of this booklet
...

• Answer all the questions
...
Marks might
be given for using a correct method, even if your answer is wrong
...

• The marks for each question are shown in brackets [ ]
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• This document has 24 pages
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© OCR 2024 [601/8690/2]
DC (PQ/FC) 342830/3

OCR is an exempt Charity

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2
1
(a) Table 1
...

Table 1
...

Sodium
Chlorine
Calcium

(i)

Atomic
Number

Group
Number

Period

Electron
Configuration

8

16(6)

2

2
...



...

20

2
...
1
2
...
7


...
1
...


[5]

(ii) When atoms lose or gain electrons, they form charged particles called ions
...

+
Na
...

[2]

© OCR 2024

3
(b) Ionic compounds form when electrons are transferred from one atom to another
...

Complete the diagram to show the arrangement of electrons and the charge of the ions in
calcium oxide
...
2 gives information about some other ionic compounds
...
2
Compound

Ions Present

Formula

Relative Formula Mass


...
5

Magnesium chloride


...


2+
2–
Mg and O


...
3

...
2
...
3, Cl = 35
...

[5]

© OCR 2024

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4
2

This question is about climate change
...

Put a ring around each correct option
...

[2]
(ii) Name one other greenhouse gas
...
[1]

(b) One method to reduce the amount of carbon dioxide in the atmosphere is called carbon capture
...

State one other method to reduce the amount of carbon dioxide in the atmosphere
...


...

Their next step was to have a peer review of their findings
...

Members of the public
...

The media
...

To make sure it is cost effective
...

To make sure results can be repeated
...


(a)
(i) Complete the balanced symbol equation for the reaction between solid zinc carbonate
and dilute acid
...

ZnCO3(s) +
...


[4]
)

ZnCl 2(
...
) + H2O(
...

Acid
...

[2]
(b) The student adds zinc carbonate to dilute acid in a conical flask
...


(i)

Which statement explains what will happen to the reading on the mass balance as the reaction
goes on?
Tick (✓) one box
...

The mass will go down because the water dilutes the acid
...

The mass will go up because some of the reactants are still present
...

Which two pieces of apparatus should be used?
Tick (✓) two boxes
...
They add copper carbonate to
sulfuric acid in a beaker until there is unreacted solid at the bottom of the container
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So that all the acid is used up
...

So that no product is left in the solution
...

[1]
(b) How can the student speed up the reaction?
Tick (✓) two boxes
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Heat the solution in the beaker
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Use a more concentrated acid
...

[2]

© OCR 2024

9
(c) Which stages of the method to produce blue crystals of copper sulfate are true and which are
false?
Tick (✓) one box in each row
...

Filter and collect solution
...

Leave solution to cool slowly and collect crystals
...


Solid

Liquid

Gas

(a)
(i)

Which descriptions about the states of matter are true and which are false?
Tick (✓) one box in each row
...

The particles in a liquid are far apart
...

[2]
(ii) Describe what happens to the movement and arrangement of the particles when a solid is heated
until it melts
...


...


...
What is the state of mercury at 20 °C?

...

(i)

What does a scientist mean by a pure substance?
Tick (✓) one box
...

It contains only one type of atom
...

[1]

(ii) How does the melting point of a substance show if it is pure?

...
[1]

© OCR 2024

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12
(d) Chromatography can also be used to test for
purity
...

A
B
C
D

(i)

Draw lines to connect each letter with its correct label
...


...

Use a locating agent at the end
...

Use an extra solvent
...

Allotropes
Diamond

Graphite

Structure

Melting Point (°C)

3550

3550

10

1–2

Low

High

drills (used for making holes)

electrodes, lubricants

Hardness
(1 = softest, 10 = hardest)
Electrical Conductivity
Uses

Explain why diamond and graphite are suitable for the uses that are stated in the table
...


...


...


...


...


...


...
[6]

© OCR 2024

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14
7

Crude oil is mainly a mixture of hydrocarbons
...


...
[1]

(b) The hydrocarbons in crude oil are separated using fractional distillation
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Crude oil

Furnace
(i)

Which property is used to separate hydrocarbons by fractional distillation?
Put a ring around the correct option
...

Use words from the list
...

Smaller hydrocarbons reach the top of the column where it is
...

This means they need
...

[4]
© OCR 2024

15
(c) The hydrocarbons in crude oil are mostly alkanes
...


2n+2

Larger hydrocarbon molecules are broken down into smaller hydrocarbon molecules using
cracking
...


C12H26

C6H12 +


...


...
[1]

(d) Other types of formula can be used to show hydrocarbon molecules
...

Complete the table
...


Molecular
Formula

Empirical
Formula

CH4

CH4

Displayed Formula

3D Structure


...


Propane

CH
3

H H
H HH
HCCCH

8


...


HHHH
[5]

© OCR 2024

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16
8

The diagram shows the structure of a metal
...

Complete the sentences to explain the properties of metals
...


Atoms

Electrons

Ions

Metals conduct electricity when solid because the
...

Metals are malleable because the
...


Metals have high melting points because there is a strong attraction between the

...

[3]
(b) A student does some experiments to find the reactivities of some metals
...

They see a reddish metal formed and the blue solution fades to colourless
...
Put a ring around the correct option
...

[1]

© OCR 2024

17
(ii) The table shows the student’s results from the other experiments:
Cu

2+
(aq)

Cu(s)

Fe

2+
(aq)

No change

Fe(s)

Change

Mg(s)

Change

Change

Ag(s)

No change

No change

2+
Mg (aq)

+
Ag (aq)

No change

Change

No change

Change
Change

No change

Write down the metals in order of reactivity
...


...


Least reactive


...
The general equation for the reaction between a metal and an acid is:
Metal + acid
(i)

salt + hydrogen

How will the results of their experiment show the order of reactivity of the metals?

...


...


...
[1]

(iii) What is the test for hydrogen gas?
Tick (✓) one box
...

Pops a lighted splint
...

Turns limewater milky
...
1 shows the diameters of some particles
...
1
Particle

(i)

Diameter (m)

Carbon atom

–10
1
...
10 × 10

Silver atom

–10
2
...
00 × 10

Which two particles have diameters with the same order of magnitude?

...
[1]

(ii) Write down the particles in order of diameter
...


...

Largest
...

Table 9
...

Table 9
...
1

0
...
001

Surface Area to
Volume Ratio

Describe the relationship between the size of a particle and its surface area to volume ratio
...


...


...
This nanoparticle has a volume of 1000 nm
...

Use the formula: surface area = 6 × (h × w)

2
Surface area =
...

Ca(OH)2(s) + 2HCl (aq)

CaCl 2(aq) + 2H2O(l)

(a) They want to find the temperature change during the reaction
...


Describe two measurements the student needs to make and the apparatus needed to make
the measurements
...


...


...
0

1

29
...
0

3

44
...
0

5

59
...

Two points have already been plotted
...


© OCR 2024

[2]

[1]

21
60

50

Temperature of
hydrochloric
40
acid (°C)

30

20 0

1

2

3

4

5

Mass of calcium hydroxide (g)
(d) Which relationship describes the graph?
Put a ring around the correct option
...
8 g of calcium hydroxide is added to the
hydrochloric acid
...


Temperature change =
...
8 g of calcium hydroxide is added to 50 cm
of hydrochloric acid
...
2 × temperature change (°C) × mass of hydrochloric acid
3
(g) 1 cm hydrochloric acid = 1
...
J [3]
END OF QUESTION PAPER
© OCR 2024

22
EXTRA ANSWER SPACE
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© OCR 2024

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Foundation
GCSE
Combined Science B Twenty First Century Science
J260/02: Chemistry (Foundation Tier)
General Certificate of Secondary Education

Mark Scheme for June 2024

Oxford Cambridge and RSA Examinations

OCR (Oxford Cambridge and RSA) is a leading UK awarding body, providing a wide range of
qualifications to meet the needs of candidates of all ages and abilities
...


It is also responsible for developing new specifications to meet national requirements and
the needs of students and teachers
...

This mark scheme is published as an aid to teachers and students, to indicate the requirements
of the examination
...
It does not
indicate the details of the discussions which took place at an examiners’ meeting before
marking commenced
...

Mark schemes should be read in conjunction with the published question papers and the
report on the examination
...


Make sure that you have accessed and completed the relevant training packages for on -screen marking: RM Assessor Online Training; OCR
Essential Guide to Marking
...


Make sure that you have read and understood the mark scheme and the question paper for this unit
...


3
...


MARKING
1
...


2
...


3
...
It is essential that you meet the RM Assessor 50% and 100% (traditional 50% Batch 1 and 100%
Batch 2) deadlines
...


4
...


2

J260/02
5
...


where a candidate crosses out an answer and provides an alternative response, the crossed out response is not marked and gain s no
marks

b
...


6
...
If the
candidate has continued an answer there then add a tick to confirm that the work has been seen
...


There is a NR (No Response) option
...
g
...
g
...

Note: Award 0 marks – for an attempt that earns no credit (including copying out the question)
...


The RM Assessor comments box is used by your Team Leader to explain the marking of the practice responses
...
Do not use the comments box for any other reason
...


9
...
The report should contain notes on particular strengths displayed as well as common errors or weaknesses
...


3

J260/02
10
...
The
indicative scientific content in the Guidance column indicates the expected parameters for candidates’ answers, bu t be prepared to recognise
and credit unexpected approaches where they show relevance
...

Once the level is located, award the higher or lower mark:
The higher mark should be awarded where the level descriptor has been evidenced and all aspects of the communication statement (in
italics) have been met
...

In summary:
The skills and science content determines the level
...


Level of response question on this paper is Q6

4

J260/02
11
...


Mark scheme

June 2024

Abbreviations, annotations and conventions used in the detailed Mark Scheme (to include abbreviations and subject -specific
conventions)
...


Mark scheme

June 2024

Subject-specific Marking Instructions

INTRODUCTION
Your first task as an Examiner is to become thoroughly familiar with the material on which the examination depends
...


You should ensure that you have copies of these materials
...
These are set out in the OCR
booklet Instructions for Examiners
...

Please ask for help or guidance whenever you need it
...


7

J260/02

Mark scheme

June 2024

The breakdown of Assessment Objectives for GCSE (9-1) in Combined Science B:
Assessment Objective
AO1

Demonstrate knowledge and understanding of scientific ideas and scientific techniques and procedures
...
1

Demonstrate knowledge and understanding of scientific ideas
...
2
AO2

Demonstrate knowledge and understanding of scientific techniques and procedures
...


AO2
...


AO2
...


AO3
AO3
...

Analyse information and ideas to interpret and evaluate
...
1a

Analyse information and ideas to interpret
...
1b

Analyse information and ideas to evaluate
...
2

Analyse information and ideas to make judgements and draw conclusions
...
2a

Analyse information and ideas to make judgements
...
2b

Analyse information and ideas to draw conclusions
...
3

Analyse information and ideas to develop and improve experimental procedures
...
3a

Analyse information and ideas to develop experimental procedures
...
3b

Analyse information and ideas to improve experimental procedures
...
2

Answer
(i)
Element

Atomic Group
Number Number

June 2024

Guidance

Period Electron
configuration

Oxygen
✓

(Sodium)
(Chlorine)
(Calcium)
(ii)
(b)

(i)

17

✓

1

✓

3

✓

2
...
8
...
8
✓
(Cl-) 2
...
8
Ca as 2
...
8 AND oxygen as 2
...
3

✓
MgO

✓

✓

2

2
...
2

5

2
...


June 2024

Marks
2

AO
element
1
...
1

ALLOW water vapour, nitrous oxide, CFCs,
ozone
IGNORE carbon monoxide

1

1
...
1
1
...
✓

10

Guidance

J260/02

Mark scheme

Question
3

(a)

Marks

Answer
(i)

2(HCl)

✓
4

(HCl)aq
(ZnCl2)aq
(CO2)g
(H2O)l

June 2024
AO
element

Guidance

2
...
2 x 3 All 4 state symbols correct = 3 marks
3 or 2 state symbols correct = 2 marks
1 state symbol correct = 1 mark

✓✓✓

(b)

✓

(ii)

Hydrochloric (acid)
✓
Zinc chloride

(i)

The mass will go down because carbon dioxide gas
leaves the flask
...
2

1

2
...
2

ALLOW Hydrogen Chloride

J260/02

4

Question
(a)
(b)

(c)

Mark scheme

Answer
So that all the acid is used up
...
✓
Use a more concentrated acid
...
2
3
...
2

Guidance

4 statements correct = 3 marks
3 or 2 statements correct = 2 marks
1 statements correct = 1 mark

J260/02

Mark scheme

Question
5
(a)

Answer
(i)

T
F
T

June 2024

Marks
2

AO
element
1
...
1

Guidance
3 correct = 2 marks
1 or 2 correct = 1 mark

✓✓

(ii)

Movement – faster/more freely/vibrate more

✓

Arrangement – more random/move further apart/not in
a fixed position/spread out/spaced out/no longer
compact

Liquid

ALLOW idea of moving but still touching
ALLOW particles sliding past one another

✓

✓

(b)
(c)

(i)

It contains only one element or compound
...
/ORA

(d)

(ii)
(i)

A

Chromatography paper

B

Solvent

C

Solvent front

D

Starting line

1
1

3
...
1

1
3

1
...
2

ALLOW specific/precise temperature
4 correct = 3 marks
3 or 2 correct = 2 marks
1 correct = 1 mark

1
1

1
...
2

ALLOW a single colour(streak/line/blob)

✓

✓✓✓
(ii)
(iii)

Only one spot/dot (moves up the paper)
Use a locating agent at the end
...

Level 3 (5–6 marks)
Explains in detail, including reference to the structure
and bonding, why diamond and graphite are suitable
for the uses stated in the table
...
The information
presented is relevant and substantiated
...
The information presented is relevant and
supported by some evidence
...
The information is in the most part
relevant
...


14

Marks
6

June 2024
AO
element
1
...
1 Demonstrates knowledge and
understanding of the properties of diamond
and graphite in relation to their uses
• Diamond is hard because there are lots
of covalent bonds forming a giant
covalent structure
• Diamond also hard because it has 4
bonds
• All 4 electrons are used in bonding in
diamond
• Diamond has no delocalised electrons
to conduct electricity
• Diamond hard because strong bonds in
all directions
...

• Both high melting points because
strong bonds between carbon atoms
and therefore a lot of energy needed to
break bonds

J260/02

Mark scheme

Question
7

Contains hydrogen and carbon only
...
1

1
4

1
...
1

1
1
5

2
...
1
2
...
1

ALLOW in either order

✓

Magnesium
Iron
Copper
Silver

1
2

3
...
2b

2

1
...
✓

16

1

3
...
2

J260/02

9

Mark scheme

Question
(a)

(i)

June 2024

AO
Marks element
1
2
...
54 x 10-10 AND
silver (atom) / 2
...
54 x 10-10
Silver (atom) / 2
...
10 x 10-9
Platinum (nanoparticle) / 1
...
2

As size/particle gets bigger, (surface area to volume)

2

3
...
ORA

✓

OR

ALLOW size increases 10 times ratio
decreases to/by a tenth/words to the effect of
going up and down by factor of 10

Size increase ten times, (surface area to volume)
ratio decreases ten times/size and ratio are inversely
proportional ORA

(c)

✓✓

First check the answer on answer line

3

2
...
3a

Answer
Any two from:
Volume of acid/50cm3 of acid – measuring
cylinder/burette/pipette/graduated beaker ✓
Temperatures measured at start – thermometer

June 2024

✓

ALLOW temperature (change)
...

Any two points correctly plotted = 1 mark
ALLOW +/- Half square tolerance
Line must start at 0/22 and end at 5/59
...

ALLOW ECF from incorrectly plotted points
IGNORE line outside grid

✓

(b)

All points correctly plotted

(c)

Line of best fit

(d)
(e)

Y=mx+c

✓✓

✓

✓

First check the answer on answer line
o
If answer = 28
...
5oC

Mass of hydrochloric acid: 50 x 1
...
2

1
2

3
...
1a

3

✓

Substitution: change in thermal energy = 4
...
5 x
✓

= 6104
...
2

✓

First check the answer on answer line
If answer = 6104
...
5 – 22
...
5 oC

(f)

Guidance
IGNORE amount of acid/solid



18

2
...

ALLOW ECF from answer to (e)/ incorrectly
evaluated mass of acid
ALLOW correct evaluation from mp2
IGNORE incorrect rounding on answer line if
correct evaluation given in working

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