Who wants to be a Chemist?
By receiving an “A” on the Weather Exam?
Who wants
an “A” on
the Weather
Exam?
Lifelines
50:50
Ask
Mr. G
Eliminate
Ask
2
The Class Answers
Question
Point Value
20 points
15 points
14 points
13 points
12 points
11 points
10 points
9 points
8 points
7 points
6 points
5 points
4 points
3 points
2 points
1 point
Total Possible points = 140
pts
As a class, if you earn
100% or 140 pts = 4 exam bonus pts
90% or 126 pts = 3 exam bonus pts
80% or 112 pts = 2 exam bonus pts
70% or 98 pts = 1 exam bonus pt
Below 98 pts = 0 quiz bonus pts
Game show rules…
There are 3 lifelines, which can only be used once each.
Lifelines cannot be used on the 20pt question.
Each member of the groups is required to participate!
Rude or disruptive behavior to your fellow classmates will
result in voiding of individual bonus point potential
earnings.
No student can use notes, or books.
Notebook paper and calculators are allowed.
Lets start with something
easy!
1 POINT
Ask Mr. G
Ask the class
What is Charles's Law?
Eliminate
2
Answers
Charles’s law: For a given sample of gas at
a certain pressure, the volume of gas is
directly proportional to its Kelvin
temperature.
Or
V1/T1 = V2/T2
2 POINTS
Ask Mr. G
Ask the class
A sample of gas has a volume of 120 L at a
temperature of 40 °C. The temperature
drops to –10 °C. What is the new volume of
the gas?
(A) 142.8 L
(C) 30 L
(B) 100.8 L
The Correct Answer is:
(D) Not enough
information
provided
B
Eliminate
2
Answers
3 POINTS
Ask Mr. G
Ask the class
Eliminate
2
Answers
Kinetic Molecular Theory
describes gases as a large number
of small particles, all of which are
in ______ and _______ motion.
Constant and
Random
4 POINTS
Ask Mr. G
Ask the class
What is Boyle’s Law?
Eliminate
2
Answers
Boyle’s law: The pressure of a given amount of gas is
inversely proportional to its volume, if the temperature
and amount of gas are not changed. The relationship
between pressure and volume can be expressed as PV
= k, or P = k(1/V), where k is the proportionality constant.
Or
P1 V1 = P2 V2
5 POINTS
Ask Mr. G
Ask the class
Eliminate
2
Answers
A balloon full of gas occupies 12.5 L, and the pressure on
the outside of the balloon is 1.6 atm.
What is the pressure on the outside of the balloon if its
new volume is 2.5 L?
(A) 0.32 atm
(C) 8 atm
(B) 16 atm
(D)
The Correct Answer
is: Not
C
enough
information provided
6 POINTS
Ask Mr. G
Ask the class
Which gas atoms move the
fastest?
(A) He
(B) Kr
(C) Ar
(D) Ne
The Correct Answer is:
A
Eliminate
2
Answers
7 POINTS
Ask Mr. G
Ask the class
What is Gay-Lussac’s Law?
Eliminate
2
Answers
Gay-Lussac’s law: The pressure of a given amount of
gas is directly proportional to temperature if the gas
volume and amount of gas do not change and if the
temperature is expressed in kelvins.
Or
P1/T1 = P2/T2
8 POINTS
Ask Mr. G
Ask the class
Eliminate
2
Answers
In the factory, a potato chip bag is filled at 1.0 atm, and the
temperature is 25°C. In a cars trunk the temperature rises
to 60°C. What is the new pressure?
(A) 0.89 atm
(C) 1.38 atm
(B) 1.12 atm
(D) Not enough
information
provided
The Correct Answer
is:
B
9 POINTS
Ask Mr. G
Ask the class
What is the Combined Gas Law?
Eliminate
2
Answers
The Combined Gas Law states the ratio between the
pressure-volume product and the temperature of a
system remains constant.
Or
P1V1/T1 = P2V2/T2
10 POINTS
Ask Mr. G
Ask the class
Eliminate
2
Answers
A sample of neon gas occupies a volume of 3.0 L at 300
K and 1.5 atm. Suppose you increase the temperature to
600 K and decrease the pressure to 0.50 atm, what is the
new volume?
(A) 18 L
(C) 2 L
(B) 4.5 L
The Correct Answer
is:
(D)
A
Not enough
information provided
Now for some
harder
questions…
11 POINTS
Ask Mr. G
Ask the class
Eliminate
2
Answers
Which Law states: the volume of gas is
directly proportional to its temperature in K?
(A) Boyle’s
(B) Ideal
(C) Charles
(D) Gay-Lussac’s
The Correct Answer is:
C
12 POINTS
Ask Mr. G
Ask the class
Eliminate
2
Answers
60mL of gas is cooled from 27°C
to 2.0°C, what is the new
volume?
(A) 65mL
(B) 55mL
The Correct Answer is:
(C) 40mL
(D) 70mL
B
13 POINTS
Ask Mr. G
Ask the class
Eliminate
2
Answers
You cap a 2.0 L plastic bottle on a mountaintop
where the air pressure is 0.85 atm and the
temperature is 3°C. How many moles of gas are in
the bottle?
(A) 1.35 moles
(B) 0.007 moles
The Correct Answer is:
(C) 0.075 moles
(D) 18.2 moles
C
14 POINTS
Ask Mr. G
Ask the class
Eliminate
2
Answers
A balloon with a volume of 7.5L @ 1.0 atm is taken into
a chamber where the volume changes to 2.5 ml, what
is the new pressure?
(A) 3,000 atm
(B) 3.0 atm
(C) 0.33 atm
(D) 1.5 atm
The Correct Answer is:
A
15 POINTS
Ask Mr. G
Ask the class
Eliminate
2
Answers
A vehicle’s tire in the morning had pressure of 1.9 atm @
4.4°C. In the afternoon the pressure was 2.17 atm. What was
the temperature in the afternoon?
(A) 265 K
(B) 323 K
(C) 301 K
(D) 317 K
The Correct Answer is:
D
20 POINTS
Ask Mr. G
Ask the class
Eliminate
2
Answers
How many molecules of He gas are in a
25,000 L weather balloon at 2.0 atm and
25°C?
(A) 3.85 x 1024
molecules
(B) 7.00 x 1024
molecules
The Correct Answer is:
(C) 9.67 x 1025
molecules
D
(D) 1.27 x 1027
molecules
Are you ready for an “A” on
your Weather Exam?