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Exam #1 Chem 100 Summer 2007 Ch 1 & 2.1-2.9 100 pts (110pts possible)
Name _____________________________________________
Helpful Hints: 2.54 cm = 1 in 454 g = 1 lb
Part 1. Fill in the blanks 5 pts
Prefix Symbol Math equiv.
d 10
3
deci 10
centi c
milli m
Part 2. Choose the Single closest or best answer. 5 pts each
- What is the total length of two pieces of tubing which measure 4.50 cm and 3.222 cm? Express
the answer to the correct number of significant figures.
A) 7.72 cm
B) 4.72 cm
C) 7.722 cm
D) D) 7.7 cm
E) E) 8 cm
- Malic acid, a compound used to increase the acidity of fruit-flavored products, freezes at 128°C and
boils at 150°C. What is its phase at 100°C, a temperature used in food processing applications?
A) solid
B) liquid
C) gas
D) a mixture of solid and liquid
E) a mixture of liquid and gas
- A laboratory technician reports that the mass of a growth removed from a patient is 274.06 g. How
many significant figures does this measurement contain?
A) 2
B) 3
C) 4
D) 5
E) none of the above
- Vegetable oil is a(an) ________, and is found in the ________ phase.
A) mixture; solid
B) compound; solid
C) element; liquid
D) mixture; liquid
E) compound; gas
- Amphetamine, a commonly abused drug, is composed of nine atoms of carbon, 13 atoms of
hydrogen, and one atom of nitrogen. The chemical formula of amphetamine is written
A) C
H
N
B) C
H
C) C
H
N
D) C
H
N
E) C
H
N
- The formula for calcium sulfate, CaSO 4
, represents a compound composed of
A) two atoms of calcium, four atoms of sulfur, and four atoms of oxygen.
B) one atom of calcium, four atoms of sulfur, and four atoms of oxygen.
C) one atom of calcium, one atom of sulfur, and four atoms of oxygen.
D) one atom of calcium and four atoms of sulfate.
E) one atom of calcium and one atom of sulfate.
- Find the difference between two masses measured as 123.60 grams and 115.972 grams. Express
the answer to the correct number of significant figures.
A) 7.6 grams
B) 7.63 grams
[Use: 1 L = 2.113 pints]
14.A solid that had a mass of 132.4 g was found to have the following measurements: length = 9.
cm; width = 46.6 mm; height = 0.111 m. What is its density in g/cm?
- If a person smokes 10.0 packs of cigarettes a week and each cigarette contains 5.00 mg of tar,
how many weeks will she have to smoke to inhale 0.500 pounds of tar? [Use: 20 cigarettes = 1 pack
and 1 pound = 454 g]
- The dosage of quinine when a 145-lb adult takes a 200.-mg tablet is ________ μg drug per kg ofg drug per kg of
