Question 1
When iron reacts with dilute hydrochloric acid, bubbles of hydrogen are produced.
Which state symbol describes these bubbles?
A aq
B g
C l
D s
[1]
OCR GCSE Combined Science A (Gateway) Chemistry Paper 3 Foundation June 2024 question paper J250/03
Practise the past exam questions by topic
Three states of matter46 Qs
Oxidation & reduction in terms of electrons21 Qs
Tests for gases10 Qs
PH scale & neutralisation16 Qs
Formulations6 Qs
Reactions of acids22 Qs
Metals & non-metals9 Qs
Subatomic particles26 Qs
Development of the model of the atom5 Qs
Periodic table45 Qs
Diamond, graphite, graphene & fullerenes8 Qs
Mixtures & separation techniques12 Qs
Pure substances9 Qs
Chromatography11 Qs
Bonding, structure & the properties of matter12 Qs
Relative formula mass17 Qs
Chemical bonds26 Qs
Conservation of mass & balanced equations52 Qs
Electronic structure18 Qs
+15 more
OCR J250 · Paper 3
17 questions
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Question 2
Magnesium reacts with oxygen to make magnesium oxide.
Which type of reaction is shown by the equation?
A Displacement
B Electrolysis
C Neutralisation
D Oxidation
[1]
Question 3
Which gas turns limewater cloudy?
A Carbon dioxide
B Chlorine
C Hydrogen
D Oxygen
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Question 4
Zinc chloride is an ionic compound made from Zn2+ and Cl– ions.
What is made at the negative electrode during the electrolysis of molten zinc chloride?
A Chlorine
B Hydrogen
C Oxygen
D Zinc
[1]
Answer
Question 5
The table shows the colours of an indicator at different pH values.
Which colour is this indicator in a neutral solution?
A Green
B Orange
C Pink
D Purple
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Question 6
The energy change in a reaction is 30 000 J.
What is the energy change in kJ ?
A 3
B 30
C 300
D 3000
[1]
Answer
Question 7
Which row describes a formulation ?
| Description | Amount of chemicals | |
| A | compound | exact |
| B | mixture | exact |
| C | compound | random |
| D | mixture | random |
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Question 8
What is the ionic equation for an aqueous neutralisation reaction?
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Question 9
The diagram represents the particle model for a change in the arrangement of some particles.
Which row describes this change?
| Type of change Explanation | |
| A | chemical The particles break up and then join together in a different way. |
| B | chemical The particles stay the same but are arranged in a different way. |
| C | physical The particles break up and then join together in a different way. |
| D | physical The particles stay the same but are arranged in a different way. |
[1]
Question 10
Question 11
Elements in the Periodic Table are made from atoms.
(a)
Atoms are made from three particles called protons, neutrons and electrons.
The diagram shows an atom.
(a)(i)
Label the names of the three particles on the diagram.
[2]
(a)(ii)
Complete the sentence about the atom.
The particle with the lowest relative mass is the proton / neutron / electron.
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(a)(iii)
The first of these three particles to be discovered was by J.J. Thomson.
Complete the sentence about the particles.
The particle that was discovered first was the proton / neutron / electron.
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(b)
Write the symbol of the element made from atoms with nine protons.
Use the Periodic Table on the Data Sheet.
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(c)
The table shows part of Mendeleev’s Periodic Table published in 1871.
| H | |||||||
| Li | Be | B | C | N | O | F | |
| Na | Mg | Al | Si | P | S | Cl | |
| K Cu | Ca Zn | Ti | V As | Cr Se | Mn Br | Fe Co Ni | |
| Rb Ag | Sr Cd | Y In | Zr Sn | Nb Sb | Mo Te | I | Ru Rh Pd |
(c)(i)
Which property did Mendeleev use to arrange the elements in his Periodic Table?
Tick (✓) one box.
[1]
(c)(ii)
Give one reason why Mendeleev left gaps in his Periodic Table.
[1]
(c)(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.
Tick (✓) one, two or three boxes.
[1]
Question 12
This question is about diamond and graphite.
(a)
The diagram shows the structure of diamond.
(a)(i)
Which element is diamond made from?
[1]
(a)(ii)
What is the maximum number of covalent bonds that each atom in diamond can form?
[1]
(a)(iii)
The atoms in diamond have a diameter of 0.000000000154 m.
What is the diameter of the atoms in standard form?
Tick (✓) one box.
[1]
(a)(iv)
The properties of diamond can be explained in terms of its structure and bonding.
Draw lines to connect each property with its correct explanation.
[2]
Question 13
A student investigates mixtures of salt and water.
(a)
The student has a solution of salt dissolved in water. The diagram shows how they separate pure water from the solution.
(a)(i)
What name is given to this method of separation? Tick (✓) one box.
[1]
(a)(ii)
The particle diagrams represent changes of state.
Which diagram represents what happens in the boiling tube?
Tick (✓) one box.
[1]
(a)(iii)
After several minutes the glass tube becomes hot, and no more water is collected in the test tube.
Give one reason why the glass tube becomes hot.
[1]
(a)(iv)
The student wants the experiment to work for longer.
What other piece of equipment can they use instead of the glass tube?
[1]
(b)
The student also investigates how adding salt to ice changes the melting point of the ice.
The table shows their results.
| Mass of salt (g) | Melting point (°C) |
| 1 | – 2 |
| 2 | – 4 |
| 3 | – 6 |
| 4 | – 8 |
(b)(i)
The student draws a bar chart of the results.
Draw a bar on the bar chart for the results when 4 g of salt are added to the ice.
[1]
(b)(ii)
Describe how changing the mass of salt changes the melting point.
[1]
(b)(iii)
The student thinks the results show that pure ice will have a melting point of 0 
C.
Explain why the student is correct.
[1]
Question 14
A teacher uses paper chromatography to show which dyes are in four different food colourings, A, B, C and D.
Fig. 14.1 shows the result of their experiment.
Fig. 14.1
(a)
Which food colouring contains the most dyes?
[1]
(b)
Which food colourings contain the same dye?
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(c)
The teacher repeats the experiment with a new food colouring Q. They find it contains the same dyes that are also found in B and D.
Draw the results for the food colouring Q on Fig. 14.2.
Fig. 14.2
[1]
(d)
Fig. 14.3 shows the result for the food colouring D.
Fig. 14.3
Calculate the Rf value for the dye in the food colouring.
Give your answer to 2 significant figures.
[3]
Question 15
Question 16
The formula of a compound is X(OH)2. X is an element found in Group 2 of the Periodic Table.
The relative formula mass of X(OH)2 is 74.1.
(a)
Calculate the relative formula mass of one OH.
Relative atomic mass (Ar): H = 1.0 O = 16.0
[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.
Use the Periodic Table on the Data Sheet.
[1]
Question 17
Lithium reacts with oxygen to form lithium oxide.
The symbols for lithium and oxygen on the Periodic Table are:
(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.
Use the Periodic Table on the Data Sheet.
[1]
(b)
Lithium reacts with oxygen to make lithium oxide.
Complete the balanced symbol equation for the reaction.
[2]
(c)
Write the electron arrangement for an atom of lithium.
[1]
(e)
A student thinks that sodium reacts in a similar way to lithium.
Explain why they are correct.
Use the Periodic Table on the Data Sheet.
[1]
(f)
Lithium can exist as two isotopes.
Explain what isotope means.
[2]
(g)
Lithium can be added to aluminium to make an alloy. One alloy contains 2% lithium.
A student draws a diagram of the alloy.
(g)(i)
Calculate the percentage of lithium atoms in the alloy drawn by the student.
[2]
(g)(ii)
Suggest a reason why the student’s diagram is incorrect.
[1]
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