OCR GCSE Chemistry A (Gateway) Paper 1 Foundation June 2024 question paper (J248/01)

Which part of an atom is negatively charged?

A Electron

B Neutron

C Nucleus

D Proton

$Question 1, shown as an image$

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Which of these changes is a chemical change?

A Ice melting

B Shaping hot metal with a hammer

C Water condensing

D Wood burning

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Which group of elements on the Periodic Table has a full outer shell of electrons?

A 0

B 1

C 2

D 7

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Sodium chloride, NaC l, is an ionic compound.

How are the ions held together in sodium chloride?

A Covalent bonds

B Delocalised electrons

C Electrostatic forces

D Intermolecular forces

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Which equipment is used for filtration ?

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Which scientist suggested the idea that electrons exist in electron shells?

A Bohr

B Dalton

C Rutherford

D Thomson

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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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The table shows information about some atoms and ions.

Which two are isotopes?

Atom or ion	Number of protons	Number of neutrons	Number of electrons
1	17	18	17
2	17	18	18
3	17	20	17
4	18	20	18

A 1 and 2

B 1 and 3

C 2 and 4

D 3 and 4

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Which dot and cross diagram shows the structure of a fluorine molecule, F₂?

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What is the balanced symbol equation for the reaction of methane with oxygen?

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The table shows the start and end temperatures of four reactions.

Which reaction is endothermic?

	Temperature at start (°C)	Temperature at end (°C)
A	19.0	19.0
B	19.0	15.2
C	20.0	23.2
D	20.0	21.0

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Which reaction profile shows an exothermic reaction with the arrow marking the activation

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The electrolysis of molten copper chloride makes copper metal and chlorine gas.

Which row describes what happens to the inert electrodes during the electrolysis of molten copper chloride?

A Mass of both electrodes decreases

B Mass of both electrodes increases

C Mass of one electrode increases, mass of one electrode decreases

D Mass of one electrode increases, mass of one electrode stays the same

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The diagram shows the electrolysis of molten sodium chloride.

Which products are made in the electrolysis of molten sodium chloride?

	Product at anode	Product at cathode
A	chlorine	hydrogen
B	chlorine	sodium
C	hydrogen	chlorine
D	sodium	chlorine

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Water boils at 100 °C and freezes at 0 °C.

(a)

Draw lines to connect each temperature with the particle mode l of water.

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(b)

Water, H₂O, contains hydrogen and oxygen atoms.

(b)(i)

How many protons does an oxygen atom have?

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(b)(ii)

How many neutrons does a hydrogen atom have?

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(b)(iii)

What is the relative charge of a proton?

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(c)

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(d)

Water is formed from the reaction of hydrogen, H₂, and oxygen, O₂.

Hydrogen is oxidised in the reaction.

Explain how you can tell from the equation.

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Answer

A student investigates a neutralisation reaction between an acid and an alkali.

(a)

Complete the sentences about how the student investigates the neutralisation reaction.

Use words from the list.

Clamp stand Conical flask Measuring cylinder

pH meter
Pipette
Thermometer

The student uses a........ to measure the volume

of acid.

They use a........ to test the pH of the acid.

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(b)

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(c)

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(d)

Complete the word equation for a neutralisation reaction.

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(e)

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(a)

The diagram shows how a town is recycling plastic waste.

The town generates a total of 45 000 kg of plastic waste in a year.

Calculate the mass of plastic waste that is not able to be recycled in the town.

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(b)

Plastics are polymers. Polymers have covalent bonds between the atoms.

(b)(i)

Explain what a covalent bond is in terms of electrons.

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(b)(ii)

Describe two differences between a polymer used to make a plastic bag and a polymer used to make a plastic bottle.

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(c)

A scientist wants to choose a polymer that is suitable for making a plastic ruler.

The scientist says that a polymer that stretches will not be suitable for making a ruler.

The diagram shows the ruler before and after stretching.

Explain why the scientist is correct.

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Answer

(d)

The properties of four different polymer samples are shown in the table.

Polymer	Melting point of sample (°C)	Distance the sample stretches before breaking (cm)
PET	260	0.0
PVC	110	12.5
PS	240	0.1
PE	125	10.4

(d)(i)

Describe the relationship between the melting point of the sample and the distance the sample stretches before breaking.

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(d)(ii)

The molecular formula of the monomer used to make PET is C₁₀H₁₀O₅.

State the empirical formula of the monomer used to make PET.

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(a)

A student investigates the reaction between sodium carbonate, Na₂CO₃, and sulfuric acid, H₂SO₄.

Sodium sulfate, water and carbon dioxide are made.

(a)(i)

Complete the balanced symbol equation for the reaction.

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(a)(ii)

Sulfuric acid has the state symbol (aq).

What does (aq) mean?

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(a)(iii)

One of the products is a gas. The student wants to collect the gas formed.

Complete the diagram to show how they can collect and measure the volume of gas.

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(b)

(b)(i)

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(b)(ii)

Draw a curve of best fit.

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(b)(iii)

Use the graph to estimate the volume of gas that has been collected at 7.5 minutes.

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(b)(iv)

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(a)

* A Periodic Table is shown with two sections, A and B.

An element, X, is shiny and conducts electricity.

State and explain if element X is found in section A or B.

In your answer, describe the differences in the physical properties of elements in sections A and B.

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(b)

In his Periodic Table, Mendeleev noticed that when elements were arranged in order of atomic mass, some elements seemed to be in the wrong place.

Complete the sentences about Mendeleev’s Periodic Table.

Use words from the list.

had the wrong mass left gaps for neutrons properties

reweighed were undiscovered

Mendeleev grouped the elements according to their........

He predicted that some elements........

He........ these elements.

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(c)

Lithium is in Group 1 of the Periodic Table and helium is in Group 0.

Explain why Group 1 elements are reactive, but Group 0 elements are unreactive.

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(a)

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(b)

Calculate the number of carbon atoms that fit in the width of the diamond.

Give your answer in standard form to 1 decimal place.

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(c)

The diagram shows the structure of diamond.

Explain why diamond cannot conduct electricity.

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(d)

Some properties of forms of carbon are shown in the table.

(d)(i)

Which form of carbon should you choose to use as an electrode in an electrolysis experiment with a molten electrolyte?

Explain your answer.

Form of carbon........

Reason........

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(d)(ii)

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(a)

(a)(i)

Calculate the surface area to volume ratio of tablet C.

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(a)(ii)

Complete the sentence to describe the relationship between the surface area to volume ratio and the time taken to dissolve.

As the surface area to volume ratio........,

the tablet will take........ time to dissolve.

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(a)(iii)

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(b)

The scientist performs thin layer chromatography on solutions of each of the tablets.

(b)(i)

The spots on the chromatogram are colourless.

State what the scientist could use to see the spots.

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(b)(ii)

After the scientist uses a method to see the spots, the chromatogram for Tablet A is shown.

Calculate the R_f value for the spot seen from tablet A.

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A student wants to separate a mixture of compounds.

Different separation methods are used depending on the mixture.

(a)

Draw lines to connect each separation method to the correct mixture.

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(b)

The student decides to use simple distillation to separate a mixture.

They set up the apparatus shown in the diagram.

(b)(i)

A liquid in the mixture is flammable.

Suggest a change the student could make to the apparatus to make the distillation safer.

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(b)(ii)

The student wants to record the boiling point of the pure liquid that is collected in the collection flask.

Suggest an improvement the student could make to the apparatus so that they can record the boiling point.

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(c)

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(d)

Calculate the relative formula mass of a (C₂H₅)₂O molecule.

Relative atomic mass (A_r): C = 12.0 H = 1.0 O = 16.0

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OCR J248 · Paper 1

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15

Question 16

Question 17

Question 18

Question 19

Question 20

Question 21

Question 22

Question 23