CHAPTER 3 ANSWERS
1. D
2. A
3. B
4. D
5. D
6. C
7. A
8. C
9. D
10. D
11. B
12. H
13. F
14. A
15. E
16. D
17. (a) The atoms are joined by covalent bonds.
(b) It has an overall electric charge.
18. (a) Mg3N2
(b) NiF3
(c) (NH4)2SO4
19. (a) strontium phosphide
(b) vanadium(V) oxide
(c) cesium dichromate
20. In a chemical change new substances with new properties are produced, while in a physical change no new
substances are produced.
1. D
2. A
3. B
4. D
5. D
6. C
7. A
8. C
9. D
10. D
11. B
12. H
13. F
14. A
15. E
16. D
17. (a) The atoms are joined by covalent bonds.
(b) It has an overall electric charge.
18. (a) Mg3N2
(b) NiF3
(c) (NH4)2SO4
19. (a) strontium phosphide
(b) vanadium(V) oxide
(c) cesium dichromate
20. In a chemical change new substances with new properties are produced, while in a physical change no new
substances are produced.