B742 02 QP Jun15 .pdf

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H

Oxford Cambridge and RSA

Monday 15 June 2015 – Morning
GCSE GATEWAY SCIENCE
CHEMISTRY B
B742/02 Chemistry modules C4, C5, C6 (Higher Tier)

* 3 7 7 5 4 0 4 3 6 2 *

Candidates answer on the Question Paper.
A calculator may be used for this paper.

Duration: 1 hour 30 minutes

OCR supplied materials:
None
Other materials required:

Pencil

Ruler (cm/mm)
*

B

7

4

2

0

2

*

INSTRUCTIONS TO CANDIDATES








Write your name, centre number and candidate number in the boxes above. Please write
clearly and in capital letters.
Use black ink. HB pencil may be used for graphs and diagrams only.
Answer all the questions.
Read each question carefully. Make sure you know what you have to do before starting
your answer.
Write your answer to each question in the space provided. Additional paper may be
used if necessary but you must clearly show your candidate number, centre number and
question number(s).
Do not write in the bar codes.

INFORMATION FOR CANDIDATES






Your quality of written communication is assessed in questions marked with a pencil (
The Periodic Table can be found on the back page.
The number of marks is given in brackets [ ] at the end of each question or part
question.
The total number of marks for this paper is 85.
This document consists of 32 pages. Any blank pages are indicated.

© OCR 2015 [D/601/6476]
DC (LK/SW) 88242/4

).

OCR is an exempt Charity

Turn over

2
Answer all the questions.
SECTION A – Module C4
1

Look at the electronic structures of some atoms.

(a) (i)

Atom

Electronic structure

W

2.8.1

X

2.8.4

Y

2.8.7

Z

2.8.8

One of the atoms is a metal which makes a positive ion.
Which one? Choose from the table.
answer ........................................

(ii)

[1]

One of the atoms has a stable electronic structure and is unreactive.
Which one? Choose from the table.
answer ........................................

(iii)

[1]

Two of the atoms can combine together by transferring electrons to form an
ionic bond.
Which two? Choose from the table.
.......................................... and ..........................................

© OCR 2015

[1]

3
(b) Ammonia has the formula, NH3.
The electronic structure of nitrogen is 2.5.
The electronic structure of hydrogen is 1.
Draw a ‘dot and cross’ diagram to show the covalent bonding in ammonia.
Show all the electrons.

[2]
(c) Sodium chloride is an ionic compound.
Sodium chloride


will not conduct electricity when it is a solid



will conduct electricity when it is dissolved in water.

Explain these two observations in terms of structure and bonding.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
.............................................................................................................................................. [2]

© OCR 2015

Turn over

4
2

Look at the information about a chlorine atom and an oxide ion.
37
17

16

Cl

8

O2–

(a) Complete the table to show the number of protons, neutrons and electrons in each particle.
Two have been done for you.
Chlorine atom, Cl

Oxide ion, O2–

Number of protons

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

8

Number of neutrons

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

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

Number of electrons

17

...............................
[3]

(b) Many scientists have helped in the development of the theory of atomic structure.
Two of these scientists were J. J. Thomson and Niels Bohr.
Describe what J. J. Thomson and Niels Bohr contributed to the theory of atomic structure.
J. J. Thomson ............................................................................................................................
...................................................................................................................................................
Niels Bohr .................................................................................................................................
.............................................................................................................................................. [2]

© OCR 2015

5
BLANK PAGE

PLEASE DO NOT WRITE ON THIS PAGE

© OCR 2015

Turn over

6
3

This question is about the reaction of Group 1 elements with water.
Lithium, sodium and potassium are Group 1 elements.
They all react with water.
Group 1 elements

water

Look at the table.

Group 1 element

Observations

15

melts
moves across surface of water
makes a gas which burns with a ‘pop’
makes an alkaline solution

potassium

7

melts and catches fire
moves quickly across surface of water
makes a gas which burns with a ‘pop’
makes an alkaline solution

lithium

25

moves slowly across surface of water
makes a gas which burns with a ‘pop’
makes an alkaline solution

sodium

© OCR 2015

Time for 0.5 g of
metal to react
in seconds

7
Rubidium is another Group 1 element.
It is below potassium in Group 1 of the periodic table.
Predict the reaction time, and name the products, of the reaction between rubidium and water.
Include a balanced symbol equation for the reaction.
The quality of written communication will be assessed in your answer to this question.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..................................................................................................................................................... [6]

© OCR 2015

Turn over

8
4

This question is about substances that are found in different types of water.
(a) River water contains dissolved substances.
River water has to be purified before it can be drunk.
The water purification process has three stages.
These are


filtration



sedimentation



chlorination.

Pollutants such as fertilisers are still in the water after this purification.
Explain why.
...................................................................................................................................................
.............................................................................................................................................. [1]
(b) Sea water can be made into drinking water.
One way this can be done is by distillation.
Look at the diagram. It shows the apparatus used to distil water in the laboratory.
water out
condenser

sea water
water in
heat

fresh water
Explain the disadvantages of using distillation to make large amounts of drinking water.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
.............................................................................................................................................. [2]
© OCR 2015

9
(c) Pete analyses two samples.
Look at Pete’s results.

Sample

Addition of
sodium hydroxide solution

Addition of
barium chloride solution

A

blue solid made

white solid made

B

brown solid made

no reaction

Pete thinks that sample A is copper sulfate.
He thinks that sample B is iron(III) sulfate.
Is Pete right about each sample?
Explain your answer.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
.............................................................................................................................................. [4]

© OCR 2015

Turn over


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