Notesale: Turn your study into money

Document Preview

Extracts from the notes are below, to see the PDF you'll receive please use the links above

---

COMBINED SCIENCE A

OCR 2024
GCSE Combined Science A
(Gateway Science)
J250/03 Chemistry (Foundation Tier)
With Marking Scheme Merged

Oxford Cambridge and RSA

Friday 17 May 2024 – Morning
GCSE (9–1) Combined Science
A (Gateway Science)
J250/03 Chemistry (Foundation Tier)
Time allowed: 1 hour 10 minutes

F

You must have:
• a ruler (cm/mm)
• the Data Sheet for GCSE (9–1) Combined
Science A (Chemistry) (inside this document)

You can use:
• a scientific or graphical calculator
• an HB pencil
*

J

2

5

0

0

3

*

Please write clearly in black ink
...


Centre number

Candidate number

First name(s)
Last name
INSTRUCTIONS
• Use black ink
...

• Write your answer to each question in the space provided
...
The question numbers must be clearly shown
...

• Where appropriate, your answer should be supported with working
...

INFORMATION
• The total mark for this paper is 60
...

• Quality of extended response will be assessed in questions marked with an asterisk (*)
...

ADVICE
• Read each question carefully before you start your answer
...

Write your answer to each question in the box provided
...

Which state symbol describes these bubbles?
A aq B
gClD
s

Your answer
2

[1]

Magnesium reacts with oxygen to make magnesium oxide
...


What is made at the negative electrode during the electrolysis of molten zinc chloride?
A Chlorine
B Hydrogen C
Oxygen D
Zinc

Your answer
5

[1]

The table shows the colours of an indicator at different pH values
...
What is the energy change in kJ?
A 3 B 30
C 300 D
3000

Your answer

© OCR 2024

[1]

Turn over

4
7

Which row describes a formulation?
Description

Amount of chemicals

A

compound

exact

B

mixture

exact

C

compound

random

D

mixture

random

Your answer
8

[1]

What is the ionic equation for an aqueous neutralisation reaction?
+
+
A H + OH

H2O

+
–
B H + OH

H2O

–
+
C H + OH

H2O

–
–
D H + OH
Your answer

© OCR 2024

H2O
[1]

5
9

The diagram represents the particle model for a change in the arrangement of some particles
...


B

chemical

The particles stay the same but are arranged in a different way
...


D

physical

The particles stay the same but are arranged in a different way
...

(a) Atoms are made from three particles called protons, neutrons and electrons
...

(i)

Label the names of the three particles on the diagram
...

Put a ring around the correct option
...


[1]

(iii) The first of these three particles to be discovered was by J
...
Thomson
...

Put a ring around the correct option
...


[1]

(b) Write the symbol of the element made from atoms with nine
protons
...


...


H

Li

Be

B

C

N

O

F

Na

Mg

Al

Si

P

S

Cl

K

Ca
Cu

Rb

V

Zn
Sr

Ag
(i)

Ti

As
Y

Cd

Cr

Zr
In

Nb
Sn

Mn
Se

Fe
Br

Ni

Mo
Sb

Ru
Te

Co

I

Rh
Pd

Which property did Mendeleev use to arrange the elements in his Periodic Table?
Tick (3) one box
...


...
[1]
(iii) Elements from which Group(s) are present in both Mendeleev’s Periodic Table and the
modern Periodic Table?
Use the Periodic Table on the Data Sheet
...

Group 1
Group 7
Group 0
[1]

© OCR 2024

Turn over

8
12 This question is about diamond and graphite
...


(i)

Which element is diamond made from?

...
[1]

(iii) The atoms in diamond have a diameter of 0
...
What is the diameter of the atoms in standard form?
Tick (3) one box
...
54 × 10
m
–10
1
...
54 × 10 m

[1]

© OCR 2024

9
(iv) The properties of diamond can be explained in terms of its structure and bonding
...

Property

Explanation
It has many strong covalent bonds
...


Does not conduct electricity

It is a simple molecule
...

[2]
(b) This diagram shows the structure of graphite
...

Properties of graphite

True

False

It conducts electricity
...

It has a high melting point
...

(a) The student has a solution of salt dissolved in water
...


Thermometer
Boiling tube
Glass tube
Solution of salt
dissolved in water

Test tube

Pure water

(i)

What name is given to this method of separation?
Tick (3) one box
...

Which diagram represents what happens in the boiling tube?
Tick (3) one box
...
Give one reason why the glass tube becomes hot
...


...

What other piece of equipment can they use instead of the glass tube?

...

The table shows their results
...

Draw a bar on the bar chart for the results when 4 g of salt are added to the ice
...


...
[1]

© OCR 2024

13
(iii) The student thinks the results show that pure ice will have a melting point of 0
°C
...


...
[1]

© OCR 2024

Turn over

14
14 A teacher uses paper chromatography to show which dyes are in four different food
colourings, A, B, C and D
...
14
...

Fig
...
1

A

B

C

D

(a) Which food colouring contains the most dyes?

...
[1]
(c) The teacher repeats the experiment with a new food colouring Q
...

Draw the results for the food colouring Q on Fig
...
2
...
14
...
14
...

Fig
...
3

Solvent front

49 mm
37 mm

Base line
D
Calculate the Rf value for the dye in the food colouring
...


Use the equation: R =
f

distance travelled by the ink

distance travelled by the solvent

Rf value =
...

+
–
It is made from sodium ions, Na , and chloride ions, Cl ions
...


+ – +
+–– ++ –
– + –
–++ –– +
+ – +
+–– ++ –

Key:
+

+
= Na

–

= Cl

–

The table show information about four materials
...

Describe properties of material C that shows it is sodium chloride
...


...


...


...


...


...


...
[6]
© OCR 2024

17
16 The formula of a compound is X(OH)2
...
The relative formula mass of X(OH)2 is 74
...

(a) Calculate the relative formula mass of one OH
...
0 O = 16
...
[1]
(b) Use your answer to part (a) to calculate the relative atomic mass of X
...
[2]
(c) Use your answer to part (b) to identify X
...



...

The symbols for lithium and oxygen on the Periodic Table are:

3
Li
6
...
0

(a) Explain how the positions of lithium and oxygen in the Periodic Table are used to decide
that lithium is a metal and oxygen is a non-metal
...


...
[1]
(b) Lithium reacts with oxygen to make lithium oxide
...



...
Li2O
[2]

(c) Write the electron arrangement for an atom of lithium
...
[1]
(d) When an atom of lithium reacts with oxygen it forms a lithium ion,
+
Li
...



...
[2]
(e) A student thinks that sodium reacts in a similar way to
lithium
...

Use the Periodic Table on the Data Sheet
...


...


3
Li
6

3
Li
7

Explain what isotope means
...


...
[2]
(g) Lithium can be added to aluminium to make an alloy
...
A student draws a diagram of the alloy
...


Percentage of lithium atoms in the alloy =
...


...
[1]

END OF QUESTION PAPER

© OCR 2024

20
EXTRA ANSWER SPACE
If you need extra space use this lined page
...


...


...


...


...


...


...


...


...


...


...


Oxford Cambridge and RSA
Copyright Information
OCR is committed to seeking permission to reproduce all third-party content that it uses in its assessment materials
...
To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced in the OCR Copyright Acknowledgements Booklet
...
ocr
...
uk) after the live examination series
...

For queries or further information please contact The OCR Copyright Team, The Triangle Building, Shaftesbury Road, Cambridge CB2 8EA
...

© OCR 2024

Oxford Cambridge and RSA

June 2024
GCSE (9–1) Combined Science A
(Gateway Science)
J250 03/04/09/10 Chemistry

Data Sheet
* 1 9 2 7 5 6 6 9 4 2 *

INSTRUCTIONS
• Do not send this Data Sheet for marking
...

INFORMATION
• This Data Sheet has 2 pages
...
0
3
Li

2
4
Be

lithium

beryllium

6
...
0
12
Mg

helium

relative atomic mass

13
5
B

magnesium

24
...
1
37
Rb

40
...
0
39
Y

47
...
9
41
Nb

52
...
9
43
Tc

55
...
5
55
Cs

87
...
9

91
...
9
73
Ta

95
...
1
76
Os

102
...
9
87
Fr

137
...
0
10
Ne

boron

carbon

nitrogen

oxygen

fluorine

neon

10
...
0
14
Si

14
...
0
16
S

19
...
2
18
Ar

aluminium

silicon

phosphorus

sulfur

chlorine

argon

12
30
Zn

27
...
1
32
Ge

31
...
1
34
Se

35
...
9
36
Kr

copper

zinc

gallium

germanium

arsenic

selenium

bromine

krypton

63
...
4
48
Cd

69
...
6
50
Sn

74
...
0
52
Te

79
...
8
54
Xe

palladium

silver

cadmium

indium

tin

antimony

tellurium

iodine

xenon

106
...
9
79
Au

112
...
8
81
Tl

118
...
8
83
Bi

127
...
9
85
At

131
...
9
45
Rh

58
...
8
106
Sg

186
...
2
108
Hs

192
...
1
110
Ds

197
...
6
112
Cn

207
...
0

89–103

180
...
4

•

178
...
0
19
K

14
6
C

GCSE
Combined Science Chemistry A Gateway Science
J250/03: Paper 3 (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
...


5
...
Where no
alternative response has been provided, examiners may give candidates the benefit of the doubt and mark the crossed out response where
legible
...
Enter a mark for each question answered into RM
assessor, which will select the highest mark from those awarded
...
)
Multiple Choice Question Responses
When a multiple choice question has only a single, correct response and a candidate provides two responses (even if one of these
responses is correct), then no mark should be awarded (as it is not possible to determine which was the first response selected by the
candidate)
...

Contradictory Responses
When a candidate provides contradictory responses, then no mark should be awarded, even if one of the answers is correct
...
The response space should be marked from left to right on each line and then line by line until the required number of responses
have been considered
...
Examiners will have to apply judgement as to whether a
‘second response’ on a line is a development of the ‘first response’, rather than a separate, discrete response
...
)
Short Answer Questions (requiring a more developed response, worth two or more marks)
If the candidates are required to provide a description of, say, three items or factors and four items or factors are provided, then mark on a
similar basis – that is downwards (as it is unlikely in this situation that a candidate will provide more than one response in each section of
the response space
...
Examiners will need to apply professional judgement as to
whether the second (or a subsequent) response is a ‘new start’ or simply a poorly expressed continuation of the first response
...


Always check the pages (and additional objects if present) at the end of the response in case any answers have been continued there
...


7
...


Award Zero ‘0’ if:
• anything is written in the answer space and is not worthy of credit (this includes text and symbols)
...

8
...
Please refer to
these comments when checking your practice responses
...

If you have any questions or comments for your Team Leader, use the phone, the RM Assessor messaging system, or email
...


Assistant Examiners will send a brief report on the performance of candidates to their Team Leader (Supervisor) via email by the end of the
marking period
...
Constructive
criticism of the question paper/mark scheme is also appreciated
...


Mark Scheme

June 2024

For answers marked by levels of response:
Read through the whole answer from start to finish, using the Level descriptors to help you decide whether it is a strong or weak answer
...
Using a ‘best-fit’ approach based on the skills and science content evidenced within the
answer, first decide which set of level descriptors, Level 1, Level 2 or Level 3, best describes the overall quality of the answer
...

The lower mark should be awarded where the level descriptor has been evidenced but aspects of the communication statement (in
italics) are missing
...

The communication statement determines the mark within a

level
...


5

J250/03
11
...

Annotation

Meaning

/

alternative and acceptable answers for the same marking point



Separates marking points

DO NOT ALLOW

Answers which are not worthy of credit

IGNORE

Statements which are irrelevant

ALLOW

Answers that can be accepted

()

Words which are not essential to gain credit

__

Underlined words must be present in answer to score a mark

ECF

Error carried forward

AW

Alternative wording

ORA

Or reverse argument

J250/03
12
...
This material includes:
•

the specification, especially the assessment objectives

•

the question paper

•

the mark scheme
...

You should ensure also that you are familiar with the administrative procedures related to the marking process
...
If you are examining for the first time, please read carefully Appendix 5 Introduction to Script Marking:
Notes for New Examiners
...
Your first point of contact is your Team Leader
...


AO1
...


AO1
...

Apply knowledge and understanding of scientific ideas and scientific enquiry, techniques and procedures
...
1

Apply knowledge and understanding of scientific ideas
...
2

Apply knowledge and understanding of scientific enquiry, techniques and procedures
...
1

Analyse information and ideas to interpret and evaluate, make judgements and draw conclusions and develop and improve
experimental procedures
...


AO3
...


AO3
...


AO3
...


AO3
...


AO3
...


AO3
...


AO3
...


AO3
...


9

J250/03

Mark Scheme

June 2024

For answers to Section A if an answer box is blank ALLOW correct indication of answer e
...
, circled or underlined
...
1

2

D

1

1
...
2

4

D

1

2
...
2

6

B

1

1
...
1

8

B

1

1
...
1

10

C

1

2
...
1 All three correct = 2 marks
One or two correct = 1 mark


(ii) The particle with the lowest relative mass is the proton /
neutron / electron
...
1

(iii) This particle was the proton / neutron / electron
...
1

1

1
...
1

1

1
...
2b

Both answers must be ticked to score this mark

J250/03

Mark Scheme

Question

Answer

12 (a) (i)
(ii)

Carbon / C



4



(iii)

June 2024

Marks

AO
element

1
1

1
...
1

1

2
...
1

1
...
54 x 10-10



1
...



13

Guidance

J250/03

Mark Scheme

(b)

2

Properties of graphite
It conducts electricity
...

It has a high melting point
...
1

All three correct = 2 marks
One or two correct = 1 mark

J250/03

Mark Scheme

Question
13

(a)

Answer

Marks

(i)

1



June 2024
AO
Guidance
element
1
...
2

1

3
...
3b

1

2
...
1a

Answer must be a comparison e
...
, just melting
point decreases scores no mark
DO NOT ALLOW the idea of just changing the
amount of salt

(iii) Idea that pure ice contains no salt / idea that increasing

salt by 1 g decreases melting point by 2 °C



16

1

3
...
2b

1

3
...
2b

(c)

Two ovals / dots / circles drawn at the same levels as
those for B and D 

1

(d)

First check answer on the answer line
If answer = 0
...
2

= 0
...
755 ✓

= 0
...
755 up to calculator
value 0
...

If no working shown this answer scores 2 marks
✓

1
...

Level 3 (5–6 marks)
Detailed explanation and use of information
Describes and explains properties of material C
...
The information presented is
relevant and substantiated
...
The information presented is relevant and
supported by some evidence
...
1
2 x 3
...
1 Apply knowledge and understanding of
scientific ideas e
...
,
Explains properties
• (is solid (at room temperature))
...
1a Analyse information and ideas to
evaluate
Describes properties of C
• is (white) solid (at room temperature)
• has a high melting point
• dissolves in water
• does not conduct heat
• conducts electricity when melted into a liquid

There is an attempt at a logical structure with a line of
reasoning
...

0 marks
No response or no response worthy of credit
...
0 / 17 award 1 mark

1

June 2024
AO
Guidance
element
2
...
0 + 1
...
0/17
(b)

First check answer on the answer line
If answer = 40
...
2

OH- x 2 = 17
...
0/34

74
...
0 = 40
...
1

ALLOW ECF from (b) only if element is in Group 2

J250/03
Question
17 (a)

Mark Scheme
Answer

Marks

Idea that lithium is on the left (of the Periodic Table) /
metals are on the left and oxygen is on the right (of the

1



Periodic Table) / non-metals are on the right

June 2024
AO
Guidance
element
1
...
1

✓



(c)

2,1

(d)

It loses (electrons)



1

2
...
1

2

2 x 2
...
1b

2

2 x 1
...
g
...
57 / 28
...
2

1

3
...
571428



= 28
...
6 / 29 (%)

(ii)

June 2024



Idea that the diagram contains too many atoms of lithium
/ too few aluminium atoms



ECF from an incorrectly calculated percentage
relating to the diagram e
...
value is below 2%
lithium
IGNORE any reference to percentage values

21



---