Honors Chemistry Review Packet KEY
Chapter 1 #s 19, 20, 22, 23, 25, 26, 33, 34, 55, 56
19. Articles are reviewed by experts in the author’s field of research.
20. To enable scientists to repeat the experiments and confirm the results.
22. A hypothesis is a proposed explanation for an observation. A theory is a well-tested explanation of
a broad set of observations and open to possibly be changed in the future; a scientific law is a
statement that summarizes the results of many observations/experiments.
23. It is a law because it is not an explanation (just says matter cannot be created nor destroyed in a
chemical change).
25. Known: 6 blocks there and 6 blocks back, so 12 blocks total Unknown: # min
12 blocks × 1 mile × 20 min = 24 min
1
10 blocks 1 mile
26. Known: 48 min Unknown: # blocks
48 min × 1 mile × 10 blocks = 24 blocks
1
20 min
1 mile
33. a) Known: 1 day
Unknown: # seconds Given (known) conversion factor: 3600 s = 1 hr
b) Conversion factors: 3600 s = 1 hr; 24 hr = 1 day
c) (3600 s/h)(24 h/day) = 86,400 s/day
1 day × 24 hrs × 3600 s = 86,400 s/day
OR 3600 s × 24 hrs = 86,400 s/day
1
1 day
1 hr
1 hr
1 day
d) There should be more seconds in a day than seconds in an hour; therefore, the relationship
was used correctly and has the correct units.
34. Although air is “invisible,” it has mass and occupies space (it’s a mixture of different gases).
55. Beats per minute = 72 Beats per hour? Per day?
72 beats × 60 min = 4320 beats/hr
1 min
1 hr
72 beats × 60 min × 24 min = 103,680 beats/day
1 min
1 hr
1 day
56. Pennies per s = 1
How many days for 1 million pennies?
6
1 × 10 pennies × 1 s × 1 min × 1 hr × 1 day = 11.57 days (12 days)
1
1 penny 60 s
60 min 24 hrs
OR 24 hrs × 60 min × 60 s = 86,400 seconds per day (or 1 day per 86,400 seconds)...
1 day
1 hr
1 min
…so 1 day × 1 s × 1 × 106 pennies = 11.57 days (12 days)
86,400 s 1 penny
1