Ch. 10
Applying the Concepts

<See the back of the chapter.>

Questions for Thought
 
 7. 	Remain the same. NaCl does not donate protons to form hydronium ions and pH is a measure of the hydronium ion concentration. Neither does NaCl accept protons to form hydroxide ions when it is dissolved in water.

<Attached Questions>

 9. T
10. T
16. C
17. D
22. B
23. D
24. C
25. D
	Ch. 18
Applying the Concepts

<See the back of the chapter.>

Questions for Thought
 
1.	A compound with carbon as its principal element is defined as an organic compound.

2.	Carbon's valence of four allows it to link up with up to four other atoms. These can be other carbon atoms as well as atoms of other elements. This ability is unique to carbon and allows it to form a wide variety of compounds.

6. (a) A mixture of hydrocarbon gases, mostly methane.
	(b) LPG is liquefied propane or butane.
	(c) Hydrocarbons in the C5 to C7 range.

7.	The octane number scale describes the burning rate of gasoline.  The scale is based on pure n-heptane, straight-chain molecules that are assigned an octane number of 0, and a multiple branched isomer of octane, 2,2,4-trimethylpentane, which is assigned an octane number of 100.  The “cracking and reforming” process used to increase the octane in unleaded gasoline is more expensive than simply adding a lead compound to the gasoline to increase its octane number.

12. 	A polymer is a long chain of repeating molecular units.  Cellulose is a polymer formed naturally in plants.  Polyethylene is a synthetically produced polymer.

<Attached Questions>

There are 12 pentagons in a C60 buckyball.

There are 20 hexagons in a C60 buckyball.

 1. F
 2. T
 3. T
 4. F
 5. T
 6. F
 8. T
11. a
13. a
15. c
16. a
17. d
18. b
19. b
20. c
23. a
26. c
28. c