UNIT 2 ANSWERS
1. A
2. C
3. D
4. C
5. B
6. D
7. B
8. C
9. D
10. C
11. F
12. B
13. G
14. H
15. I
16. E
17. L
18. D
19. G
20. J
21. Increased heat causes particles in solid to move faster.
Spaces increase between particles in the solid, weakening their connection with each other.
Particles begin to flow past each other, which makes it a liquid.
22. Sketch shows 5p and 6n together in a nucleus and electrons are arranged in the pattern 2, 3.
23. (a) Ca 20p 2, 8, 8, 2
(b) Al3+ 13p 2, 8
(c) Cl 17p 2, 8, 8
BLM 1-45
24. (a) silver
(b) oxygen
(c) boron
(d) manganese
(e) chlorine
25. For example, six of: silver/grey coloured, conduct heat, conduct electricity, malleable, ductile, shiny, react with
air, react with water, low melting point, soft.
26. (a) sodium chloride
(b) magnesium phosphide
(c) iron(II) oxide
(d) ammonium phosphate
(e) platinum(IV) sulphate
27. (a) CaBr2
(b) Cu3P
(c) K2CO3
(d) Al(OH)3
(e) Ru(SO4)2
28. (a) In a physical change, no new substances are formed, however in a chemical change new substances with
new properties are formed as new chemical bonds form, and old ones break.
(b) For example, melting ice is a physical change, while burning wood is a chemical change.
1. A
2. C
3. D
4. C
5. B
6. D
7. B
8. C
9. D
10. C
11. F
12. B
13. G
14. H
15. I
16. E
17. L
18. D
19. G
20. J
21. Increased heat causes particles in solid to move faster.
Spaces increase between particles in the solid, weakening their connection with each other.
Particles begin to flow past each other, which makes it a liquid.
22. Sketch shows 5p and 6n together in a nucleus and electrons are arranged in the pattern 2, 3.
23. (a) Ca 20p 2, 8, 8, 2
(b) Al3+ 13p 2, 8
(c) Cl 17p 2, 8, 8
BLM 1-45
24. (a) silver
(b) oxygen
(c) boron
(d) manganese
(e) chlorine
25. For example, six of: silver/grey coloured, conduct heat, conduct electricity, malleable, ductile, shiny, react with
air, react with water, low melting point, soft.
26. (a) sodium chloride
(b) magnesium phosphide
(c) iron(II) oxide
(d) ammonium phosphate
(e) platinum(IV) sulphate
27. (a) CaBr2
(b) Cu3P
(c) K2CO3
(d) Al(OH)3
(e) Ru(SO4)2
28. (a) In a physical change, no new substances are formed, however in a chemical change new substances with
new properties are formed as new chemical bonds form, and old ones break.
(b) For example, melting ice is a physical change, while burning wood is a chemical change.