CHEM 2011 PAPER 1

8/7/2019 CHEM 2011 PAPER 1

1/20

Paper Reference(s)

7081/01London Examinations GCE

Chemistry

Ordinary Level

Paper 1

Wednesday 12 January 2011 AfternoonTime: 1 hour 15 minutes

Materials required for examination Items included with question papers

Nil Nil

Instructions to Candidates

In the boxes above, write your centre number, candidate number, your surname, initial(s) and signature.Answer ALL the questions. Write your answers in the spaces provided in this question paper.

Information for Candidates

A Periodic Table is printed on the back cover of this question paper.Calculators may be used.The total mark for this paper is 100.The marks for individual questions and the parts of questions are shown in round brackets: e.g. (2).

There are 13 questions in this question paper.Any blank pages are indicated.

DATAOne mole of any gas occupies 24 000 cm3 at room temperature and atmospheric pressure.One mole of electrons carries a charge of 96 500 coulombs or 1 faraday.

Advice to Candidates

Write your answers neatly and in good English.In calculations, show all the steps in your working.

Examiners use only

Team Leaders use only

Question LeaveNumber Blank

1

2

3

4

5

6

7

8

9

10

11

12

13

Total

Surname Initial(s)

Signature

Centre

No.

*N36637A0120*Turn over

Candidate

No.

Paper Reference

7 0 8 1 0 1

This publication may be reproduced only in accordance with

Edexcel Limited copyright policy.

2011 Edexcel Limited.

Printers Log. No.

N36637AW850/U7081/57570 5/5/5/

8/7/2019 CHEM 2011 PAPER 1

2/20

Leave

blank

2

*N36637A0220*

Answer ALL the questions.

1. Complete the table.

Name of compound Formula of compound

calcium bromide

NH4NO3

sodium sulphite

copper(I) oxide

PbO2

iron(III) sulphateQ1

(Total 6 marks)

8/7/2019 CHEM 2011 PAPER 1

3/20

Leave

blank

3

Turn over*N36637A0320*

2. Complete the following statements by inserting the missing colours.

(a) When water is added to anhydrous cobalt chloride, it turns

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

(1)

(b) When iodine is heated, it forms a ............................................... vapour.

(1)

(c) The element whose atomic number is 16 is a ............................................... solid at

room temperature.

(1)

(d) Ammonia and hydrogen chloride react to form a ............................................... solid.

(1)

(e) When nitrogen monoxide is mixed with air, a ............................................... gas is

formed.

(1)

(f) When calcium is burned in oxygen, the product is a ...............................................

solid.

(1) Q2

(Total 6 marks)

8/7/2019 CHEM 2011 PAPER 1

4/20

Leave

blank

4

*N36637A0420*

3. Identify, by name or formula, an element or compound that fits each of the descriptions.

(a) A gas molecule containing three atoms that is present in dry air.

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

(1)

(b) A white solid that is formed when magnesium carbonate is heated.

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

(1)

(c) The precipitate formed when aqueous potassium carbonate is added to aqueous

calcium nitrate.

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

(1)

(d) A diatomic gas molecule that consists of two different atoms covalently bonded

together.

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

(1)

(e) A metal that will burn with a brick red flame.

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

(1)

(f) A colourless solution with a pH of 14.

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

(1)

(g) The gas evolved when potassium nitrate is heated.

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

(1) Q3

(Total 7 marks)

8/7/2019 CHEM 2011 PAPER 1

5/20

Leave

blank

5


4. Complete the following statements, using the Periodic Table where necessary.

(a) The electron configuration for phosphorus is ............................................... .

(1)

(b) The element that is in Group 6 and Period 4 is ............................................... .

(1)

(c) The number of electrons in the outer shell of tin (atomic number = 50)

is ............................................... .

(1)

(d) The atom with an electron configuration 2,8,8 is ............................................... .

(1)

(e) A Group 1 element that is more reactive than potassium

is ............................................... .

(1)

(f) The type of bond formed between strontium (atomic number 38) and bromine

is .................................................................................................................................. .

(1) Q4

(Total 6 marks)

8/7/2019 CHEM 2011 PAPER 1

6/20

Leave

blank

6

*N36637A0620*

5. Give the number of:

(a) atoms in a molecule of (CH3)2CHCH2Br

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

(1)

(b) single covalent bonds in the alkene C4H8

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

(1)

(c) protons in an atom of calcium

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

(1)

(d) moles of ethane needed to form four moles of carbon dioxide on complete

combustion

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

(1)

(e) sulphate ions that ionically bond to two aluminium ions in aluminium sulphate

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

(1)

(f) moles of nitric acid in 250 cm3 of nitric acid of concentration 0.500 mol dm3

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

(1) Q5

(Total 6 marks)

8/7/2019 CHEM 2011 PAPER 1

7/20

Leave

blank

7


6. (a) Draw diagrams to show the arrangement and spacing of particles in the three states of

matter. Use a small circle to represent a particle.

solid liquid gas

(6)

(b) Explain why it requires less energy to convert one mole of ice to water than to convert

one mole of water to steam.

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

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

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

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

(2) Q6

(Total 8 marks)

8/7/2019 CHEM 2011 PAPER 1

8/20

Leave

blank

8

*N36637A0820*

7. (a) Complete and balance the equations.

(i) Al + Cl2

(2)

(ii) NaOH + Fe(NO3)3 +

(2)

(iii) KOH + K2SO4 +

(2)

(b) Write the ionic equation for the neutralisation of an alkali with an acid.

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

(1) Q7

(Total 7 marks)

8/7/2019 CHEM 2011 PAPER 1

9/20

Leave

blank

9


8. (a) What is meant by the term oxidation?

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

(1)

(b) (i) State with a reason which species has been oxidised.

Mg(s) + Cu2+(aq) Mg2+(aq) + Cu(s)

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

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

(1)

(ii) State with a reason which species has been reduced.

2Ag

+

(aq) + Sn

2+

(aq)

2Ag(s) + Sn

4+

(aq)

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

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

(1)

(c) Give two observations that could be made during the reaction in (b)(i).

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

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

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

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

(2) Q8

(Total 5 marks)

8/7/2019 CHEM 2011 PAPER 1

10/20

Leave

blank

10

*N36637A01020*

9. (a) Draw diagrams to show the shapes of the following molecules using a line to represent

a covalent bond. Do not show electron arrangements.

(i) Ammonia

(2)

(ii) Carbon dioxide

(2)

(b) (i) Complete the diagrams to show the electron arrangements in nitrogen and

oxygen.

Nitrogen, N2

Oxygen, O2

(4)

(ii) Explain in terms of bonding why nitrogen is much less reactive than oxygen.

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

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

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

(2) Q9

(Total 10 marks)

8/7/2019 CHEM 2011 PAPER 1

11/20

Leave

blank

11


10. Atoms of iron and nickel can be represented as5626Fe,

5826Fe and

5828Ni.

(a) (i) Give two ways in which the atomic structures of the atoms of iron are the same.

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

................................................................................................................................(2)

(ii) Give one way in which the atomic structures of the atoms of iron are different.

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

(1)

(iii) What name is given to these types of atoms of iron?

................................................................................................................................(1)

(b) Give one way in which the nucleus of the atom of nickel is the same as the nucleus

of one of the atoms of iron.

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

(1)

(c) Explain why the chemical reactions of the two different atoms of iron are identical.

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

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

(1)

(d) Explain why both iron and nickel are good conductors of electricity.

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

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

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

(2) Q10

(Total 8 marks)

8/7/2019 CHEM 2011 PAPER 1

12/20

Leave

blank

12

*N36637A01220*

11. (a) An unsaturated compound X has the following percentage composition by mass.

C = 38.4% H = 4.8% Cl = 56.8%

(i) Show that the empirical formula is C2H3Cl.

(2)

(ii) The relative molecular mass is 62.5. Use this to determine the molecular formula

ofX.

(1)

(iii) Draw the displayed formula forX.

(1)

(iv) Draw a section of the polymer chain formed ifX were to be polymerised.

(1)

(v) State three conditions used in industry in the polymerisation of an alkene.

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

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

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

(3)

8/7/2019 CHEM 2011 PAPER 1

13/20

Leave

blank

13


(b) A section of a polymer chain is shown below. Write the structural formulae of the two

monomers.

OC (CH2)4 CO.NH (CH2)6 NH

Monomer 1

Monomer 2

(2) Q11

(Total 10 marks)

8/7/2019 CHEM 2011 PAPER 1

14/20

Leave

blank

14

*N36637A01420*

12. A student was asked to perform titrations to determine the relative molecular mass, and

hence the identity, of a white solid which was known to be one of the following two

organic acids.

A HOOC.CH2.COOH B HOOC.CH2CH2.COOH

The student dissolved a weighed amount of the acid in water in a conical flask and titratedit against sodium hydroxide of concentration 0.400 mol dm3. Phenolphthalein indicator

was used to obtain an accurate end-point. The results obtained are recorded in the table.

Mass of acid used / g Volume of NaOH used / cm3

0.25 12.0

0.40 15.0

0.46 22.1

0.65 31.3

0.85 40.9

(a) Give the colour of phenolphthalein at the end-point.

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

(1)

8/7/2019 CHEM 2011 PAPER 1

15/20

Leave

blank

15


(b) Plot these results on the grid below. The position of one of the points indicates a poor

result that should be ignored; on the grid draw a circle around that point. Using a

ruler, draw a straight line of best fit through the other four points.

(4)

45.0

40.0

35.0

30.0

25.0

20.0

15.0

10.0

5.0

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

0.90

Mass of acid / g

0

Volumeof0.

400moldm

3NaOHadded/c

m3

8/7/2019 CHEM 2011 PAPER 1

16/20

Leave

blank

16

*N36637A01620*

(c) The equation for the reaction can be written using H2X to represent the acid.

H2X + 2NaOH Na2X + 2H2O

(i) Use the graph to find the mass of acid that would give a titration value of 25.0 cm3

of sodium hydroxide of concentration 0.400 mol dm3.

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

(1)

(ii) Use the mass of acid in part (i) to find the relative molecular mass of the acid,

H2X.

Moles of NaOH in 25.0 cm3:

Moles of acid used:

Relative molecular mass of H2X:

(4)

(iii) Calculate the relative molecular mass of each of the organic acids A and B and

hence identify the unknown acid.

Mr(A) = ..................................................................................................................

Mr(B) = ..................................................................................................................

Unknown acid is ....................................................................................................

(2) Q12

(Total 12 marks)

8/7/2019 CHEM 2011 PAPER 1

17/20

Leave

blank

17

*N36637A01720*

13. Give a simple test to distinguish between each of the following pairs of substances. State

what would be observed for each substance.

(a) Sodium chloride and potassium chloride.

Test ................................................................................................................................

Observation for sodium chloride ..................................................................................

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

Observation for potassium chloride .............................................................................

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

(3)

(b) Ammonia and sulphur dioxide.

Test ................................................................................................................................

Observation for ammonia .............................................................................................

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

Observation for sulphur dioxide ...................................................................................

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

(3)

(c) Magnesium oxide and magnesium carbonate.

Test ................................................................................................................................

Observation for magnesium oxide ...............................................................................

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

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

Observation for magnesium carbonate .........................................................................

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

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

(3)

TOTAL FOR PAPER: 100 MARKS

END

Q13

(Total 9 marks)

8/7/2019 CHEM 2011 PAPER 1

18/20

18

*N36637A01820*

BLANK PAGE

8/7/2019 CHEM 2011 PAPER 1

19/20

19

*N36637A01920*

BLANK PAGE

8/7/2019 CHEM 2011 PAPER 1

20/20

Documents

CHEM 2011 PAPER 1