Pearson Edexcel Level 1/Level 2 GCSE (9-1) Chemistry

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Pearson Edexcel

Level 1/ Level 2 GCSE (9-1)

Chemistry

Paper 1

Foundation Tier

Thursday 17 May 2018 ¨C Morning

Time: 1 hour 45 minutes

Paper Reference

1CH0/1F

You must have:

Calculator, ruler

Total Marks

Instructions

black ink or ball-point pen.

? Use

Fill in the boxes at the top of this page with your name,

? centre

number and candidate number.

Answer

? Answer allthequestions.

in the spaces provided

? ¨C there may bequestions

more space than you need.

may be used.

? Calculators

diagrams may NOT be accurately drawn, unless otherwise indicated.

? Any

You

must

all your working out with your answer clearly identified at

? the end ofshow

your solution.

Information

total mark for this paper is 100

? The

for each question are shown in brackets

? ¨CTheusemarks

this as a guide as to how much time to spend on each question.

questions marked with an asterisk (*), marks will be awarded for your

? Inability

to structure your answer logically showing how the points that you

make are related or follow on from each other where appropriate.

A periodic table is printed on the back cover of this paper.

?

Advice

each question carefully before you start to answer it.

? Read

to answer every question.

? Try

Check

? your answers if you have time at the end.

P52472RA

?2018 Pearson Education Ltd.

1/1/1/1/1/1/1/

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Answer ALL questions. Write your answers in the spaces provided.

and then

1 Figure 1 shows the dot and cross diagram for a molecule of ammonia.

H

N

H

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Some questions must be answered with a cross in a box .

If you change your mind about an answer, put a line through the box

mark your new answer with a cross .

H

(a) (i) What do the dots and crosses represent in the diagram?

(1)

A electrons

B neutrons

C protons

D nuclei

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Figure 1

(ii) Give the formula for the molecule of ammonia.

(1)

. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............ ............................................................................................................................... . . . . . . . . . . . . . . . . . . . . . .

(b) (i) Ammonia can be manufactured by the Haber process.

nitrogen + hydrogen U ammonia

State the meaning of the

symbol.

(1)

. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............ ............................................................................................................................... . . . . . . . . . . . . . . . . . . . . . .

2

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The word equation for the reaction is

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(ii) In the Haber process, the percentage yield of ammonia at equilibrium

changes with temperature.

Figure 2 shows how the percentage yield of ammonia at equilibrium changes

with temperature.

percentage yield 100

of ammonia

90

at equilibrium

80

70

60

50

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40

30

20

10

0

200 250 300 350 400 450 500 550 600 650 700

temperature in ¡ãC

Figure 2

State what happens to the percentage yield of ammonia at equilibrium as the

temperature increases.

(1)

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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . . . . .

(iii) Use the graph to find the percentage yield of ammonia at equilibrium at 450¡ãC.

(1)

percentage yield of ammonia at equilibrium = ........................ . . . . . . . . . . . . . . . . . . . . . .

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(c) Ammonia reacts with nitric acid to form ammonium nitrate.

(1)

. . . . . . . . . . . .................................... . . . . . . .

+

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .....

¡ú

....................................................................................................................... . . . . . . . . . . . . . . . . . . . . .

(ii) An ammonium ion has the formula NH4+.

A nitrate ion has the formula NO3¨C.

Which of the following is the formula for ammonium nitrate?

(1)

A (NH)4NO3

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(i) Complete the word equation for this reaction.

B (NH4NO)3

C NH4NO3

D (NHNO)12

(2)

. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............ ............................................................................................................................... . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . . . . .

(Total for Question 1 = 9 marks)

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(iii) Explain why farmers spread ammonium nitrate on their fields.

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BLANK PAGE

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5

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