H.
W- 1
Q-1:
A concise verbal statement or mathematical equation that
summarizes a broad variety of observations and experiences is called
a(n) __________.
A) law
B) theory
C) hypothesis
D) experiment
Q-2:
1 picometer = __________ centimeters
A) 1 × 1010
B) 1 × 10−10
C) 1 × 108
D) 1 × 10−8
Q-3:
Osmium has a density of 22.6 g/cm3 . The mass of a block of osmium
that measures 1.01 cm × 0.233 cm × 0.648 cm is __________ g.
A) 6.75 × 10−3
B) 3.45
C) 148
D) 6.75 × 103
Q-4:
The number 1.00430 has __________ significant figures.
A) 2
B) 3
C) 5
D) 6
Q-5:
The density of lead is 11.4 g/cm3 . The mass of a lead ball with a
radius of 0.50 mm is __________ g. V (sphere) = 4 / 3 π r 3
A) 6.0
B) 4.6 ×10 -2
C) 4.6 ×10 -5
D) 6.0 ×10 -3
Q-6:
The law of constant composition applies to __________.
A) solutions
B) heterogeneous mixtures
C) compounds
D) homogeneous mixtures
Q-7:
Which one of the following is often easily separated into its
components by simple techniques such as filtering or decanting?
A) heterogeneous mixture
B) compounds
C) homogeneous mixture
D) elements
Q-8:
The law of constant composition says __________.
A) that the composition of a compound is always the same
B) that all substances have the same composition
C) that the composition of an element is always the same
D) that the composition of a homogeneous mixture is always the same
Q-9:
Which of the following is an illustration of the law of constant
composition?
A) Water boils at 100°C at 1 atm pressure.
B) Water is 11% hydrogen and 89% oxygen by mass.
C) Water can be separated into other substances by a chemical process.
D) Water and salt have different boiling points.
Q-10:
In the following list, only __________ is not an example of a
chemical reaction.
A) dissolution of a penny in nitric acid
B) the condensation of water vapor
C) a burning candle
D) the rusting of iron
