Pearson Edexcel International GCSE (9–1) Thursday 14 ...



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Pearson Edexcel

Centre Number

International GCSE (9?1)

Candidate Number

Thursday 14 January 2021

Morning (Time: 1 hour 15 minutes)

Chemistry

Unit: 4CH1 Paper 2C

Paper Reference 4CH1/2C

You must have: Calculator, ruler

Total Marks

Instructions

Use black ink or ballpoint pen.

?? Fill in the boxes at the top of this page with your name, centre number and candidate number. Answer all questions.

?? Answer the questions in the spaces provided ? ? there may be more space than you need.

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 and then mark your new answer with a cross .

Information

The total mark for this paper is 70.

?? The marks for each question are shown in brackets ? use this as a guide as to how much time to spend on each question.

Advice

Read each question carefully before you start to answer it.

? Try to answer every question. ?? Check your answers if you have time at the end.

P67081A

?2021 Pearson Education Ltd.

1/1/1/1/

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The Periodic Table of the Elements

1

7 Li

lithium

3

23 Na

sodium

11

39 K

potassium

19

85 Rb

rubidium

37

133 Cs

caesium

55

[223] Fr

francium

87

2

9 Be

beryllium

4

24 Mg

magnesium

12

40 Ca

calcium

20

88 Sr

strontium

38

137 Ba

barium

56

[226] Ra

radium

88

45 Sc

scandium

21

89 Y

yttrium

39

139 La*

lanthanum

57

[227] Ac*

actinium

89

Key

relative atomic mass atomic symbol

name

atomic (proton) number

48 Ti

titanium

22

91 Zr

zirconium

40

178 Hf

hafnium

72

[261] Rf

rutherfordium

104

51 V

vanadium

23

93 Nb

niobium

41

181 Ta

tantalum

73

[262] Db

dubnium

105

52 Cr

chromium

24

55 Mn

manganese

25

96 Mo

molybdenum

42

[98] Tc

technetium

43

184 W

tungsten

74

186 Re

rhenium

75

[266] Sg

seaborgium

106

[264] Bh

bohrium

107

1 H

hydrogen

1

56 Fe

iron

26 101 Ru

ruthenium

44 190 Os

osmium

76 [277] Hs

hassium

108

59 Co

cobalt

27

103 Rh

rhodium

45

192 Ir

iridium

77

[268] Mt

meitnerium

109

59

63.5

Ni

Cu

nickel

copper

28

29

106 Pd

palladium

46

108 Ag

silver

47

195 Pt

platinum

78

197 Au

gold

79

[271] Ds

darmstadtium

110

[272] Rg

roentgenium

111

3

4

5

6

65 Zn

zinc

30

112 Cd

cadmium

48

201 Hg

mercury

80

11 B

boron

5

27 Al

aluminium

13

70 Ga

gallium

31

115 In

indium

49

204 Tl

thallium

81

12 C

carbon

6

14 N

nitrogen

7

28 Si

silicon

14

31 P

phosphorus

15

73 Ge

germanium

32

119 Sn

tin

50

75 As

arsenic

33

122 Sb

antimony

51

207 Pb

lead

82

209 Bi

bismuth

83

16 O

oxygen

8

32 S

sulfur

16

79 Se

selenium

34

128 Te

tellurium

52

[209] Po

polonium

84

7

19 F

fluorine

9

35.5 Cl

chlorine

17

80 Br

bromine

35

127 I

iodine

53

[210] At

astatine

85

0

4 He

helium

2

20 Ne

neon

10

40 Ar

argon

18

84 Kr

krypton

36

131 Xe

xenon

54

[222] Rn

radon

86

Elements with atomic numbers 112?116 have been reported but not fully authenticated



* The lanthanoids (atomic numbers 58?71) and the actinoids (atomic numbers 90?103) have been omitted. The relative atomic masses of copper and chlorine have not been rounded to the nearest whole number.



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Answer ALL questions. Write your answers in the spaces provided. 1 The diagram shows an atom of an element.

Y

+ +

+

(a) (i) What is the name of the particle labelled Y? (1)

A electron

B ion

C neutron

D proton

(ii) Give the mass number of this atom. (1)

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

(iii) Name this element. Use the Periodic Table on page 2 to help you.

(1)

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

(b) There are two isotopes of this element. Give one way, in terms of sub-atomic particles, that these isotopes are the same

and one way that they are different. (2)

same .....................................................................................................................................................................................................................................................................

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

different ............................................................................................................................................................................................................................................................

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

(Total for Question 1 = 5 marks)

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2 This question is about gases. (a) The box gives the names of some gases.

argoncarbon dioxidehydrogennitrogenoxygen

Use gases from the box to answer these questions. Each gas may be used once, more than once or not at all. (i) Name the most abundant gas in the Earth's atmosphere.

(1)

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

(ii) Name the gas that is a compound. (1)

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

(iii) Name the least reactive of the gases. (1)

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

(iv) Name the gas formed by the complete combustion of hydrocarbons. (1)

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

(b) Describe the test for hydrogen gas. (1)

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

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

(Total for Question 2 = 5 marks)

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3 This question is about carboxylic acids. Solutions of carboxylic acids react with magnesium metal to form hydrogen gas. A student uses this apparatus to investigate the time taken to produce 10cm3 of hydrogen gas from different carboxylic acids.

magnesium

carboxylic acid solution

This is the student's method. pour some carboxylic acid solution into a conical flask add some magnesium powder quickly connect the gas syringe and start a timer record the time taken to collect 10cm3 of hydrogen gas

The student repeats the method with three other carboxylic acids. (a) (i) All the carboxylic acids are of the same concentration. Give two other variables the student should control in his investigation.

(2)

1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

(ii) Give a reason why it is important to connect the gas syringe quickly. (1)

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

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(b) The table shows the student's results.

Carboxylic acid

Methanoic acid

Ethanoic acid

Propanoic acid

Butanoic acid

Formula of carboxylic acid

HCOOH CH3COOH CH3CH2COOH CH3CH2CH2COOH

Time taken to produce 10 cm3 of hydrogen in s

Experiment Experiment Experiment Experiment

1

2

3

4

48

50

47

49

61

63

60

61

69

93

70

71

83

85

82

81

Mean time in s

49 61

83

(i) Calculate the mean (average) time for propanoic acid to produce 10cm3 of hydrogen gas. (2)

mean time = s ............................................................................. (ii) Deduce the relationship between the number of carbon atoms in the

molecule and the time taken to produce 10cm3 of hydrogen gas. (1)

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

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

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(c) An ester is formed by adding ethanoic acid to ethanol in the presence of sulfuric acid. Give the displayed formula of the ester produced when ethanoic acid reacts

with ethanol. (2)

(Total for Question 3 = 8 marks)

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