2025 OCR AS Level Chemistry B (Salters) H033/01 Foundations of chemistry Combined Question
Paper & Final Marking Scheme
Oxford Cambridge and RSA
Tuesday 13 May 2025 – Morning
AS Level Chemistry B (Salters)
H033/01 Foundations of chemistry
Time allowed: 1 hour 30 minutes
You must have:
• the Data Sheet for Chemistry B
You can use:
• a scientific or graphical calculator
• an HB pencil
* H 0 3 3 0 1 *
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined page at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• This document has 20 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025 [601/5446/9] OCR is an exempt Charity
DC (ST/JG) 344603/5 Turn over
,*1428844795*
, 2
SECTION A
You should spend a maximum of 25 minutes on this section.
Write your answer to each question in the box provided.
1 What is correct about atomic number?
A It is half the mass number for most elements.
B It is the number of neutrons in the nucleus.
C It determines the position of an element in the periodic table.
D It varies between isotopes of the same element.
Your answer [1]
2 Which of these is a tertiary alcohol?
A CH3CH(OH)CH3
B
OH
C H H H
H C C C OH
H H H
D OH
Your answer [1]
3 Which row has the homologous series named correctly?
Compound Homologous series
A CH3CHO ketone
B CH3NH2 amine
C CH3COOCH3 carboxylic acid
D CH3COCH3 aldehyde
Your answer [1]
© OCR 2025
, 3
4 Ethanol can be dehydrated.
C2H5OH C2H4 + H2O
What process describes this reaction?
A drying
B elimination
C oxidation
D reduction
Your answer [1]
5 A student is measuring the effect of temperature on the rate of reaction of hydrochloric acid with
calcium carbonate.
What is a variable that must be controlled?
A mass of calcium carbonate
B size of reacting flask
C temperature
D volume of CO2 produced
Your answer [1]
6 A substance has a high melting point and is soluble in water.
What is the structure type of the substance?
A covalent network
B ionic
C metallic
D simple molecular
Your answer [1]
© OCR 2025 Turn over
Paper & Final Marking Scheme
Oxford Cambridge and RSA
Tuesday 13 May 2025 – Morning
AS Level Chemistry B (Salters)
H033/01 Foundations of chemistry
Time allowed: 1 hour 30 minutes
You must have:
• the Data Sheet for Chemistry B
You can use:
• a scientific or graphical calculator
• an HB pencil
* H 0 3 3 0 1 *
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined page at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• This document has 20 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025 [601/5446/9] OCR is an exempt Charity
DC (ST/JG) 344603/5 Turn over
,*1428844795*
, 2
SECTION A
You should spend a maximum of 25 minutes on this section.
Write your answer to each question in the box provided.
1 What is correct about atomic number?
A It is half the mass number for most elements.
B It is the number of neutrons in the nucleus.
C It determines the position of an element in the periodic table.
D It varies between isotopes of the same element.
Your answer [1]
2 Which of these is a tertiary alcohol?
A CH3CH(OH)CH3
B
OH
C H H H
H C C C OH
H H H
D OH
Your answer [1]
3 Which row has the homologous series named correctly?
Compound Homologous series
A CH3CHO ketone
B CH3NH2 amine
C CH3COOCH3 carboxylic acid
D CH3COCH3 aldehyde
Your answer [1]
© OCR 2025
, 3
4 Ethanol can be dehydrated.
C2H5OH C2H4 + H2O
What process describes this reaction?
A drying
B elimination
C oxidation
D reduction
Your answer [1]
5 A student is measuring the effect of temperature on the rate of reaction of hydrochloric acid with
calcium carbonate.
What is a variable that must be controlled?
A mass of calcium carbonate
B size of reacting flask
C temperature
D volume of CO2 produced
Your answer [1]
6 A substance has a high melting point and is soluble in water.
What is the structure type of the substance?
A covalent network
B ionic
C metallic
D simple molecular
Your answer [1]
© OCR 2025 Turn over
