castlebraechs.files.wordpress.com€¦ · Web viewPast Paper. Answers. Chemical Changes and...
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Castlebrae Community High SchoolChemistry Department
NATIONAL 5 CHEMISTRY
Unit 1:Chemical Changes and Structure
Past PaperAnswers
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Chemical Changes and Structure PPQ answers
Rates of Reaction
1. 32 – 10 = 2.75 (1) accept 2.8 8
2. scales correct and both labels and units correct (1)plotting of points and joining of points (1)Max of 1 mark if bar graph/spike graph (labels, units and scale) or if both scales taken from tableAllow ½ box tolerance on plotting of points for eachAllow 1 plotting errorAxes can be reversed
3. Answer 0.0015 (1) Units not required
4. 0.017 (1) Units not required
5. D (1)
6. C (1)
7. A (1)
8. D (1)
9. (a) scales correct and both labels and units correct (1)plotting of points and joining of points (1)Max of 1 mark if bar graph/spike graph (labels, units and scale) or if both scales taken
from tableAllow ½ box tolerance on plotting of points for eachAllow 1 plotting errorAxes can be reversed
(b) Must check reading from graph 0.5 tolerance (1)No graph drawn 34-35
(c) (2.2-1.2)/10 = 0.1 (1)
10. (a) points and line correct (1)
(b) 1/0.0125 = 80secs (1)
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Atomic Structure and Bonding Related to Properties of Materials
1. (a)
(2)
(b)
(1)
2. (a)
(1)
(b)
3.(1)
4.
(1)
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5. (1)
6. sodium phosphate (1)
7. (a)
(1)
(b)
(1)
8. (a) (i)
(1)
(ii) 34 (1)
(b) 64 (1)
9.
(1)
10. (a)
(1)
(b)(1)
11.
(1)
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12. (1)
13. (a) (1)
(b)
(1)
(c) (1)
14. (a)
(1)
(b) 20 (1)
15.
(1)
16. (1)
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Formulae and Reaction Quantities
1. (1)
2. (a)
(1)
(b)
(2)
3.
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(2)4. (a)
(1)
(b)
(1)
5. (a)
(1)
(b)
(1)
6.
(1)
7.
(1)
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8. (a) 25g (1)
(b)
(1)
9.
(2)10.
(1)
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Acids and Bases
1.
(1)
2. (a)
(1)
(b) Spectator ions/spectate (1)
3. a higher (1)
4. Copper carbonate CuCO3 (1)
5. Neutralisation (1)
6. (a) Red/pink/orange/yellow (1)
(b)(1)
7. D (1)
8. A (1)
9. A (1)
10. A (1)
11. (a) Paper X − Blue; Paper Y – Red Both correct (1)
(b) Ammonium chloride (correct formula accepted) (1)