OCR GCSE Chemistry A (Gateway) Paper 1 Foundation June 2018 question paper J248/01

1h 45m 90 marks

26 questions

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Which of these pH values shows the pH of a strong acid?

A 1

B 5

C 7

D 10

$Question 1, shown as an image$

[1]

Answer

Which of these general properties correctly describes a metal?

A Ductile and good conductor of heat

B High density and forms negative ions

C Malleable and low density

D Shiny and brittle

$Question 2, shown as an image$

[1]

Answer

A number of scientists contributed to the development of the atomic model.

Which of these scientists discovered the electron?

A Bohr

B Dalton

C Rutherford

D Thomson

$Question 3, shown as an image$

[1]

Answer

This is a section of the Periodic Table.

In which section of the Periodic Table would you find non-metals ?

$Question 4, shown as an image$

[1]

Answer

What is the typical size of the radius of an atom?

10^–2 m A

10^–5 m B

10^–10 m C

10^–20 m D

$Question 5, shown as an image$

[1]

Answer

[1]

Answer

Look at the equation.

$Question 7, shown as an image$

Which substance is oxidised in this reaction?

A CH₄

B CO₂

C H₂O

D O₂

$Question 7, shown as an image$

[1]

Answer

Look at the equation.

$Question 8, shown as an image$

Which substance is the oxidising agent in this reaction?

A CH₄

B CO₂

C H₂O

D O₂

$Question 8, shown as an image$

[1]

Answer

Which statement about covalent bonding is true?

A Electrons are transferred from one atom to another.

B Electrons are delocalised.

C Electrons are shared between atoms.

D Ions are formed.

$Question 9, shown as an image$

[1]

Answer

The electronic structure of an atom of an element is 2.8.8.2.

In which period of the Periodic Table is this element found?

A 1

B 2

C 4

D 8

$Question 10, shown as an image$

[1]

Answer

The electronic structure of an atom of an element is 2.8.8.2.

In which group of the Periodic Table is this element found?

A 1

B 2

C 4

D 8

$Question 11, shown as an image$

[1]

Answer

What is the name of the gas made when zinc carbonate reacts with hydrochloric acid?

A Carbon dioxide

B Chlorine

C Hydrogen

D Oxygen

$Question 12, shown as an image$

[1]

Answer

Which equation represents neutralisation ?

$Question 13, shown as an image$

[1]

Answer

Which of these statements about nanoparticulate materials is correct?

A Nanoparticles are much smaller than atoms.

B Nanoparticulate materials can be used as catalysts.

C Nanoparticulate materials have a very small surface area to volume ratio.

D There are no risks when using nanoparticulate materials.

$Question 14, shown as an image$

[1]

Answer

Ethanol is a liquid at room temperature. It has a low melting point and boiling point.

Why?

A Ethanol is an ionic compound.

B The forces of attraction between ethanol molecules are strong.

C The forces of attraction between ethanol molecules are weak.

D There are no forces of attraction between ethanol molecules.

$Question 15, shown as an image$

[1]

Answer

A student investigates the energy changes during some chemical reactions.

She measures the temperature at the start and end of each reaction.

Look at her results.

Reaction	Temperature at start (°C)	Temperature at end (°C)	Temperature change (°C)	Type of reaction
A	20	25	.............................	Exothermic
B	18	10	.............................	.............................
C	21	35	.............................	.............................
D	20	20	.............................	No reaction

(a)

Complete the table.

[3]

Answer

(b)

Which reaction has the largest energy change?

[1]

Answer

(c)

Look at the reaction profile for reaction A.

(c)(i)

Calculate the energy change in this reaction.

[1]

Answer

(c)(ii)

Calculate the activation energy.

[1]

Answer

Look at the diagram. It shows the displayed formula of succinic acid.

(a)

Complete the table to show the number of atoms of each element in this displayed formula.

Element	Number of atoms
C	..............................
H	..............................
O	..............................

[2]

Answer

(b)

What is the empirical formula of succinic acid?

[1]

Answer

(c)

Succinic acid has a melting point of 184 °C and a boiling point of 235 °C.

What is the state of succinic acid at 25 °C?

Explain your answer.

[2]

Answer

A student is separating some mixtures. She wants to make pure water from a solution of salt water. She filters the mixture.

Her method does not work.

(a)

Explain why her method does not work and describe the method she should use.

[2]

Answer

(b)

The student wants to separate a mixture of two liquids.

The liquids are:

Liquid	Boiling point (°C)
Water	100
Ethanol	78

Which separation technique should she use?

Explain how the method works.

[2]

Answer

(c)

The student separates two solid substances A and B. She wants to check that they are pure

(c)(i)

What is meant by a pure solid ?

[1]

Answer

(c)(ii)

The student measures the melting points of four samples of solid A.

Look at her results.

Sample	Melting point (°C)
1	115
2	119
3	114–118
4	120–122

She knows that a pure sample of solid A has a melting point of 120 °C.

She concludes that sample 4 is the purest sample of solid A.

Do the results support her conclusion?

Explain your answer using evidence from the table.

[3]

Answer

Two students heat some calcium carbonate, CaCO₃.

Look at the equation for the reaction.

$Question 19, shown as an image$

(a)

What is the meaning of (s) in the equation?

[1]

Answer

(b)

Look at their results.

Mass of calcium carbonate (g)	Mass of calcium oxide (g)	Mass of carbon dioxide (g)
1.00	0.56	0.44
2.00	1.12	0.88
3.00	1.68	1.32
4.00	2.24	...............................

Complete the table.

[1]

Answer

(c)

Student A states:

‘If I heat 20 g of calcium carbonate, I will make 8.8 g of calcium oxide and 11.2 g of carbon dioxide.’

Is student A correct?

Explain your answer.

[2]

Answer

(d)

Student B investigates another reaction.

Look at the equations.

$Question 19, shown as an image$

magnesium + oxygen $fraction$ magnesium oxide

(d)(i)

Calculate the relative formula mass of magnesium oxide.

[1]

Answer

(d)(ii)

Use the relative formula mass of magnesium oxide and the relative atomic masses of magnesium and oxygen to show if mass is conserved during this reaction.

[2]

Answer

A student electrolyses dilute sulfuric acid.

Hydrogen gas is made at the cathode.

The student measures the volume of hydrogen made at the cathode every 2 minutes for 10 minutes.

Look at his results.

Time (minutes)	Volume of hydrogen(cm₃)
0	0.0
2	4.0
4	8.0
6	14.0
8	16.0
10	20.0

(a)

[2]

Answer

(b)

One of the results is anomalous.

Circle the anomalous result on the graph.

[1]

Answer

(c)

[1]

Answer

(d)

[2]

Answer

The diagrams show the structures of diamond and graphite.

Diamond Graphite

One property of diamond is that it is very hard. One property of graphite is that it is slippery.

(a)

Write about the other properties of diamond and graphite.

Diamond........

Graphite........

[4]

Answer

(b)

Describe the type of bonding between the carbon atoms in diamond.

[1]

Answer

(c)

Graphite is slippery.

Use the structure of graphite to explain why.

[2]

Answer

(a)

Which particles are present in the charge cloud?

[1]

Answer

(b)

Which two particles make up the nucleus?

[1]

Answer

(c)

Most of the mass of an atom is in the nucleus.

Explain why.

[2]

Answer

(d)

Look at these two atoms of chlorine. 35 37

$Question 22, shown as an image$

What is the relationship between these two atoms of chlorine?

Explain your answer.

[2]

Answer

A forensic scientist is investigating the ink that has been used to forge the signature on a cheque.

She separates the colours in some inks using paper chromatography.

Look at the diagram of her apparatus.

(a)

What is the mobile phase in this experiment?

[1]

Answer

(b)

Explain how paper chromatography separates the colours in ink.

[1]

Answer

(c)

(c)(i)

Look at the green spot for ink A.

Calculate the R_f value for the green spot.

[2]

Answer

(c)(ii)

Which ink was used to forge the signature on the cheque?

Explain how you can tell.

[2]

Answer

24* Look at the data about some substances.

Substance	Melting point (°C)	Boiling point (°C)	Does it conduct Electricity?	Density(g/cm₃)
A	0	100	No	1.0
B	1085	2562	Good conductor	9.0
C	801	1413	Solid does not conduct but conducts when melted or when dissolved in water	2.2

What is the type of bonding present in each of substances A, B and C?

Explain how you can tell.

[6]

Answer

Magnesium is an element. It is solid at room temperature.

(a)(i)

Solid magnesium cannot be compressed.

Why?

[1]

Answer

(a)(ii)

Solid magnesium cannot flow, but liquid magnesium can flow.

Explain why.

[3]

Answer

(a)(iii)

Magnesium gas completely fills any container it is put in.

Explain why.

[2]

Answer

(b)

Magnesium reacts with water. Magnesium hydroxide, Mg(OH)₂, and hydrogen, H₂, are made.

Write a balanced symbol equation for this reaction.

[2]

Answer

(c)

Magnesium nitrate has the formula Mg(NO₃)₂.

Calculate the relative formula mass of magnesium nitrate.

[1]

Answer

A student has a solution of hydrochloric acid, HC l, and a solution of sodium hydroxide, NaOH.

He wants to make a pure, dry sample of sodium chloride.

(a)

Describe how he can do this.

Include the apparatus he should use and his method.

[4]

Answer

(b)

Write a balanced symbol equation for the reaction.

[1]

Answer

(c)

The student also investigates other reactions.

The table shows the salts he can make from different starting materials.

Complete the table.

Acid used	Other starting material	Salt made
Sulfuric acid	Copper oxide	................................
................................	Zinc carbonate	Zinc nitrate
Hydrochloric acid	................................	Magnesium chloride

[3]

Answer

(d)

What type of reaction happens when sulfuric acid reacts with copper oxide?

[1]

Answer

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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

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Question 12

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Question 15

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Question 18

Question 19

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Question 26