# 15-2 Behavior of Gases 15-3 Graphing Gas Behavior

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15-2 Behavior of Gases
15-3 Graphing Gas Behavior
Measuring Gases

• Volume – the amount of space matter fills
– Measured in cm3, mL, L
– Volume of a gas is the same as the volume of
its container
• Temperature – measure of the energy of
motion of particles
– Faster = higher temperature
• Pressure – an outward push of a gas on the
walls of a container
– Pressure = Force/ Area
Relating Pressure & Volume
• Boyle’s Law
– If pressure of a gas is increased = the volume of
the gas decreases
– If the pressure of a gas is decreased = the
volume of the gas increases
http://www.grc.nasa.gov/WWW/K-12/airplane/aboyle.html
Relating Pressure &
Temperature
• If increase temperature of
a gas = increase in
pressure
• If decrease temperature of
a gas = decrease in
pressure
• On long trips truck tires
heat up and the pressure
increases and the tire can
pop
Relating Volume & Temperature
• Charles’s Law
– When temperature of a gas increases = the
volume increases
– When temperature of a gas decreases = the
volume decreases
– Basketball left out overnight in cold becomes
soft because volume of air inside decreased
http://www.grc.nasa.gov/WWW/K-12/airplane/aglussac.html
Graphing Gas Behavior
• X – axis is horizontal
– Graph manipulated variable on x-axis
• Y –axis is vertical
– Graph responding variable on y-axis
• Label each axis with the name of the
variable, the units used, and the range of
variables
Directional Proportional Graphs

• If a graph shows a straight line passing
through point 0,0 the variables are
directional proportional to each other
– Ex. Charles’s Law
Inversely Proportional Graphs
• When a graph forms a curve, the variables
vary inversely with each other.
– Ex. Boyle’s Law
Temperature is a measure of the
motion of particles in a substance                                                               10
1. True
0 of 45
2. False

0%                  0%

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volume :                   cm3        :: distance :
1.        cm2
2.        mL                        0 of 45

3.        kg
4.        cm

0%        0%         0%         0%
2

cm
kg
L
cm

1    2    3     4    5    6    7    8      9    10   11   12   13    14    m
15    16   17    18   19   20
21   22   23    24   25   26   27   28     29   30   31   32   33    34   35    36   37    38   39   40
41   42   43    44   45
Pressure is force/area
1. True
2. False                                  0
of
45

20

0%                  0%

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1    2    3     4    5    6    7    8    9    10   11   12   13   14     15   16   17   18     19    20
21   22   23    24   25   26   27   28   29   30   31   32   33   34     35   36   37   38     39    40
41   42   43    44   45
According to Boyle’s Law, as
volume decreases, pressure
1.        decreases
2.        increases                                0
of
3.        doesn’t change                           45

4.        none of the above

1    2    3     4    5    6    7    8    9    10   11   12   13   14   15   16   17   18   19   20
21   22   23    24   25   26   27   28   29   30   31   32   33   34   35   36   37   38   39   40
41   42   43    44   45
If the temperature of a gas
increases, then the pressure
1.        decreases                                    45

2.        increases
0
3.        doesn’t change
4.        none of the above                             0

1    2    3     4    5    6    7    8    9    10   11       12   13   14   15   16   17   18   19   20
21   22   23    24   25   26   27   28   29   30   31       32   33   34   35   36   37   38   39   40
41   42   43    44   45
According to Charles’s Law, if
the temperature of a gas
increases, volume
1.        decreases
2.        increases
3.        doesn’t change
4.        none of the above
0 of 45

1    2     3    4    5      6   7    8    9    10   11   12   13   14   15   16   17   18   19   20
21   22   23    24   25    26   27   28   29   30   31   32   33   34   35   36   37   38   39   40
41   42   43    44   45
Boyles’s Law is a directional
proportional graph
1. True
2. False

20
Seconds
0 of 45                       Remaining

0%                  0%

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21   22   23   24   25   26   27   28   29   30   31   32   33   34     35   36   37   38     39    40
41   42   43   44   45
Charles’s Law is a directional
proportional graph
1. True
2. False                                20

0
of
45

0%                  0%

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ue

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Fa
1    2    3    4    5    6    7    8    9    10   11   12   13   14     15   16   17   18     19    20
21   22   23   24   25   26   27   28   29   30   31   32   33   34     35   36   37   38     39    40
41   42   43   44   45
This shows Boyle’s Law
1. True
20
2. False

0 of 45

0%                  0%

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1    2    3    4    5    6    7    8    9    10   11   12   13   14     15   16   17   18     19    20
21   22   23   24   25   26   27   28   29   30   31   32   33   34     35   36   37   38     39    40
41   42   43   44   45
directional proportional : straight
line :: Boyle’s Law :
1.    straight line
2.    volume
3.    temperature
4.    curved line
0 of 45                                 0%               0%           0%             0%

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21   22   23   24   25   26   27    28   29   30   31   32    33      34     35        36    37       38     39     40
41   42   43   44   45

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