CHAPTER 1 ANSWERS
4. A
5. B
6. A
7. B
8. C
9. C
10. A
11. B
12. E
13. D
14. H
15. A
16. G
17. (a) Something unexpected and hazardous might occur when working without supervision or on an unapproved
activity that you might not be able to deal with.
(b) Another person working in the laboratory might spill something into your eye.
(c) The lab is full of poisons–even the bench tops should be viewed as unclean from the point of view of food
safety. (Students might also mention the distractibility of eating while they should be paying attention to
their investigation.)
18. (a) All the atoms in a piece of copper are different from the atoms in a piece of gold. A copper atom cannot be
converted (by non-nuclear means) into an atom of gold.
(b) Atoms contain a tiny, dense, positively charged centre, which he called the nucleus.
(c) Electrons exist in atoms by occupying specific energy levels or shells.
19. (a) In the nucleus
(b) Electron(s)
(c) In the nucleus (or in the protons)
4. A
5. B
6. A
7. B
8. C
9. C
10. A
11. B
12. E
13. D
14. H
15. A
16. G
17. (a) Something unexpected and hazardous might occur when working without supervision or on an unapproved
activity that you might not be able to deal with.
(b) Another person working in the laboratory might spill something into your eye.
(c) The lab is full of poisons–even the bench tops should be viewed as unclean from the point of view of food
safety. (Students might also mention the distractibility of eating while they should be paying attention to
their investigation.)
18. (a) All the atoms in a piece of copper are different from the atoms in a piece of gold. A copper atom cannot be
converted (by non-nuclear means) into an atom of gold.
(b) Atoms contain a tiny, dense, positively charged centre, which he called the nucleus.
(c) Electrons exist in atoms by occupying specific energy levels or shells.
19. (a) In the nucleus
(b) Electron(s)
(c) In the nucleus (or in the protons)