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Review Midterm 1 CHE 209
The prefix centi means ________.
A scientific hypothesis is
Review Midterm 1 CHE 209
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1
A scientific hypothesis is
predictive.
testable.
explanatory.
all of the above.
2
The prefix centi means ________.
10-1
10-3
102
10-2
3
The formula mass of CO
2
is
28 g/mole.
44 u.
44 g/mole.
28 u.
4
Which developed first?
technology
chemistry
natural philosophy
alchemy
5
In a risk-benefit analysis, which situation is often the most difficult to evaluate from both an individual and society?
All are equally difficult to evaluate.
large benefit and low risk
small benefit and high risk
large benefit and high risk
6
Methapyrilene (used in sleeping pills) was found to be a potent carcinogen (causes cancer). The DQ for methapyrilene is
High
Uncertain
Low
Moderate
7
Which of the following does NOT contain Avogadro's number of particles?
6.02 × 1023 atoms of aluminum
23 g of sodium
1.0 mole of silver
12 g of water
8
In the SI system of measurement, the unit of length is the
yard.
kilogram.
liter.
meter.
9
With respect to the number of variables that are involved in experiments, which of the disciplines is the most complex?
chemistry
anatomy
mathematics
psychology
10
Which of these is a chemical change?
Bleaching powder dissolves in water.
The hair stylist cuts your hair.
Wool is spun into yarn.
Silkworms convert mulberry leaves into silk.
11
On Mars, gravity is one-third that on Earth. What is the weight on Mars of a person who is 200 pounds (lb) on Earth?
600 lb
66.7 lb
200 lb
133 lb
12
A chemical change always involves a change in the ________ of matter.
composition
volume
state
temperature
13
Mendeleev arranged elements in the periodic table primarily in order of their
atomic weights.
atomic masses.
umber of neutrons.
both atomic weights and atomic numbers.
14
Rachel Carson was an early proponent of
conservation.
pesticides to improve crops.
using insects to improve pollination.
environmental awareness.
15
Which of the following is a chemical property?
Sugar dissolves in water.
Gasoline and water do not mix.
Sugar is a solid at room temperature.
Potassium reacts with water to form potassium hydroxide.
16
Which of the following is NOT true for a scientific law?
It summarizes observed scientific data.
It is universal and will hold everywhere under the stated conditions.
It is often stated in mathematical terms.
It explains observed scientific data.
17
--- Chemistry is designed to meet needs of the present generation without compromising the needs of future generations.
Sustainable
Organic
Experimental
Green
