Chemistry homework
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CHEM Homework # 1
1.
What properties of aluminum might cause you concern if you had to use the aluminum tableware
that Napoleon employed to impress his guests? (6 point)
2.
Which of the following items are matter and which are not? (a) a flashlight, (b) sunlight, (c) an
echo, (d) air at sea level, (e) air at the top of Mount Everest. (6 point)
3.
Which part of the description of a compound or element refers to its physical properties and which
to its chemical properties? (6 point)
(a) Calcium carbonate is a white solid with a density of 2.71 g/cm3. It reacts readily with an acid to
produce gaseous carbon dioxide.
(b) Gray powdered zinc metal reacts with purple iodine to give a white compound.
4.
All molecules attract each other to some extent, and the attraction decreases as the distance between
particles increases. Based on this idea, which state of matter would you expect has the strongest
interactions between particles, solids, liquids or gases? (6 point)
5.
Two golfers are practicing shots around a putting green. Each golfer takes 20 shots. Golfer 1 has 7
shots within 1 meter of the hole, and the other 13 shots are scattered around the green. Golfer 2 has
17 shots go into a small sand trap near the green and three just on the green near the trap. Which
golfer is more precise? Which is more accurate? (8 points)
6.
Convert the value 0.120 ppb into ppm. (Show detailed convert) (6 points)
7.
Express (a) 275C in K, (b) 25.55 K in C, (c) –47.0C in F, and (d) 100.0F in K. (10 points)
8.
How many significant figures are there in each of the following? (a) 0.136 m, (b) 0.0001050 g,
(c) 2.700 10–3 nm, (d) 6 10–4 L, (e) 56003 cm3 (5 points)
9.
Perform these calculations and express the result with the proper number of significant figures.
(10 points)
(a) (4.850 g – 2.34 g)/1.3 mL
(b) V = r3, where r = 4.112 cm
(c) (4.66 10–3) 4.666
(d) 0.003400/65.2
10.
Measurements indicate that 23.6% of the residents of a city with a population of 531,314 are
college graduates. Considering significant figures, how many college graduates are estimated to
reside in this city? (5 points)
11.
Carry out each of the following conversions: (a) 25.5 m to km, (b) 36.3 km to m, (c) 487 kg to g,
(d) 1.32 L to mL, (e) 55.9 dL to L, (f ) 6251 L to cm3. (Show detailed convert) (12 points)
12.
If a vehicle is traveling 92 m/s what is its velocity in miles per hour? (0.62 miles = 1.00 km).
(Show detailed convert) (8 points)
13.
The dimensions of aluminum foil in a box for sale in supermarkets are 66 2 yards by 12 inches.
3
The mass of the foil is 0.83 kg. If its density is 2.70 g/cm3, then what is the thickness of the foil in
inches? (Show detailed calculation) (12 points)
…
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