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NATIONAL QUALIFICATIONS 2011 THURSDAY, 26 MAY 10.50 AM – 12.20 PM
CHEMISTRY
STANDARD GRADE
Credit Level
Fill in these boxes and read what is printed below. Full name of centre Town
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Date of birth Day Month
Year
Scottish candidate number
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1 All questions should be attempted. 2 Necessary data will be found in the Data Booklet provided for Chemistry at Standard Grade and Intermediate 2. 3 The questions may be answered in any order but all answers are to be written in this answer book, and must be written clearly and legibly in ink. 4 Rough work, if any should be necessary, as well as the fair copy, is to be written in this book. Rough work should be scored through when the fair copy has been written. 5 Additional space for answers and rough work will be found at the end of the book. 6 The size of the space provided for an answer should not be taken as an indication of how much to write. It is not necessary to use all the space. 7 Before leaving the examination room you must give this book to the Invigilator. If you do not, you may lose all the marks for this paper.
PART 1 In Questions 1 to 10 of this part of the paper, an answer is given by circling the appropriate letter (or letters) in the answer grid provided. In some questions, two letters are required for full marks. If more than the correct number of answers is given, marks will be deducted. A total of 20 marks is available in this part of the paper. SAMPLE QUESTION A CH4 D CO (a) Identify the hydrocarbon. A D B E C F E C2H5OH B H2 F C C CO2
The one correct answer to part (a) is A. This should be circled. (b) Identify the two elements. A D B E C F
As indicated in this question, there are two correct answers to part (b). These are B and F. Both answers are circled. If, after you have recorded your answer, you decide that you have made an error and wish to make a change, you should cancel the original answer and circle the answer you now consider to be correct. Thus, in part (a), if you want to change an answer A to an answer D, your answer sheet would look like this: A D B E C F
If you want to change back to an answer which has already been scored out, you should enter a tick (✓) in the box of the answer of your choice, thus:
✓
A D
B E
C F
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Marks KU PS 1. Limewater can be made by dissolving calcium hydroxide in water. Identify the term used to describe the water. A B C D solute solvent solution insoluble
A B C D (1)
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2.
Distillation of crude oil produces several fractions.
Number of carbon atoms per molecule
Marks KU PS
Fraction
A
1– 4
B
4 –10
C
10 –16
crude oil
D
16 –20
E
20+
(a) Identify the fraction which is used to tar roads.
A B C D E (b) Identify the fraction which is most flammable. A B C D E 1 (2) 1
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3.
The grid shows the symbols of some elements. A O D F E Li B K F Al C P
Marks KU PS
(a) Identify the element with the lowest density. You may wish to use the data booklet to help you. A D B E C F 1
(b) Identify the two elements which can form ions with the same electron arrangement as argon. You may wish to use the data booklet to help you. A D B E C F 1
(c) Identify the two elements which would react together to form a molecule with the same shape as an ammonia molecule. A D B E C F 1 (3)
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4.
The table contains information about some substances. Melting point/°C –7 1492 1407 606 –39 –78 Boiling point/°C 59 2897 2357 1305 357 –33 Conducts as Conducts as a solid a liquid no yes no no yes no no yes no yes yes no
