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GNUR 160 - Chemistry Chapter 1
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GNUR 160 - Chemistry Chapter 1
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GNUR 160 - Chemistry Chapter 1Suppose that while rearranging your room a few months ago, you moved your favorite
plant. Now you notice that the plant is dying. Which of the following explanations are
testable hypotheses?
1. The plant is dying because it was moved to a darker location.
2. The plant is dying because it is sad.3. The plant is dying because it was moved to a
warmer location. - ANS-Statements 1 and 3 are testable hypotheses. You could test
hypothesis 1 by adjusting the amount of light in the room, and hypothesis 3 by varying
the temperature.
Which of the following terms describes things that are consistently and reproducibly
observed? - ANS-Law
You pick up a rubber band and stretch it. What change takes place in the potential
energy of the rubber band? - ANS-The rubber band contains more stored energy, so its
potential energy increases.
Is stretching then releasing the rubber band a physical change? - ANS-Yes, nothing new
is created.
You let go of the rubber band and it snaps back to its original shape. What change takes
place in the potential energy of the rubber band? What changes take place in its kinetic
energy? - ANS-Its potential energy decreases as it releases back to its original shape.
As it snaps, the rubber band's kinetic energy (motion) initially increases but then
decreases
Which of the following is an example of potential energy?
Car rolling down hill
Climber going down mountain
Clock hands rotating
Hammer sitting atop a ladder - ANS-Hammer sitting atop a ladder
It was once common to reduce a fever by applying isopropyl alcohol to the skin. As the
alcohol evaporates (liquid becomes gas), the skin cools. Explain the changes in heat
energy as this process takes place. Note: Reducing a fever this way is no longer
recommended. - ANS-The heat energy required to convert rubbing alcohol from a liquid
to a gas is provided by the heat in the skin. As heat moves from the skin into the
rubbing alcohol, the skin cools.
, Which represents 0.000305 in correct notation?
3.05 x 10^4
0.305 x 10 ^4
3.05 x 10^-4 (NUMBER MUST BE BETWEEN 1 AND 10) - ANS-3.05 x 10^-4
(NUMBER MUST BE BETWEEN 1 AND 10)
Convert to scientific notation:
0.0144 - ANS-1.44 x 10^-2
Convert to scientific notation:
144 - ANS-1.44 x 10^2
Convert to scientific notation:
36.32 - ANS-3.632 x 10^1
A small hot tub holds 2000 L of water. Express this volume by adding an appropriate
prefix to "liter" - ANS-2 kL
(kiloliters)
kilo = 1,000
Thirty drops of water corresponds to 0.002 L of water. Express this volume by adding an
appropriate prefix to "liter." - ANS-0.002 L = 2 x 10^-3 L = 2 mL
(milliliters)
milli = .001
Significant Figures - ANS-- The digits in a measurement that are reproducible when the
measurement is repeated, plus ONE uncertain digit
Zeros:
- All zeros are significant except the ones at the end or the ones at the beginning unless
the ones at the end have a decimal point
Specify the number of significant figures in each measured value
30.1 - ANS-3
Significant Figures
0.00730 - ANS-3 (because the last 0 counts even though it is at the end because the
zeros at the end count if there is a decimal present)
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