The Tools Of Chemistry Worksheets With Answer Key Page 7
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9Chapter 1 — Tools of Chemistry
Page 7
1-38. A floor is painted with 750. mL of paint. If the floor to be covered is 20.0 ft by 18.0 ft,
how thick is the paint layer?
(a)
2.08 cm
(b)
0.0145 cm
(c)
0.00224 cm
(d)
0.0234 cm
1-39. A ball of iron, which may be used in the “shotput” event at a track meet, has a mass of 16.0
3
pounds. If the density of iron is 7.874 g/cm
, and if 1.00 pound is equivalent to 454 g,
3
what is the diameter of the iron ball? (The volume of a sphere is (4/3) • (π) • r
, where r is
the radius of the sphere.)
(a)
24.0 cm
(b)
12.1 cm
(c)
9.23 cm
(d)
6.08 cm
1-40. You have purchased a piece of highly pure iron foil for $55.00. The foil is 50. mm square
3
and 1.00 mm thick. What is the cost per gram of foil? (Density of iron = 7.874 g/cm
.)
(a)
$2.79 / gram
(b)
$0.28 / gram
(c)
$0.36 / gram
(d)
$5.50 / gram
1-41. You want to purchase some very pure iron wire. If wire with a thickness of 2.00 mm costs
$54.10 for 24.8 grams, how many centimeters of wire can you buy for $100.00? (The
2
volume of a piece of wire is given by π • r
• length, where r is the radius of the wire.The
3
density of iron is 7.874 g/cm
.)
(a)
5.82 cm
(b)
100. cm
(c)
185 cm
(d)
1.85 cm
1-42. Which of the following is a chemical property of iron?
3
(a)
Density = 7.874 g/cm
(b)
Iron melts at 1808 K.
(c)
Iron corrodes in moist air.
(d)
Iron is soft when pure.
1-43. Aluminum metal melts at 934 K. Is this a description of a chemical or physical property of
aluminum?
(a)
chemical
(b)
physical
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