Gases Chemistry Worksheet - Chapter 13, An Introduction To Chemistry Page 48
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Chapter 13
Gases
109. With reference to the relationships between properties of gases, answer the
following questions.
a. When the air is pumped out of a gallon can, the can collapses. Why?
b. A child’s helium balloon escapes and rises into the air where it expands and
pops. Why?
110.
When people inhale helium gas and talk, their voices sound strange, as if it had
been recorded and played back at a faster rate. Why do you think that happens?
111. If the following reaction is run in a cylinder with a movable piston that allows
the pressure of gas in the cylinder to remain constant, and if the temperature is
constant, what will happen to the volume of gas as the reaction proceeds? Why?
(g) + 3H
(g) → 2NH
N
(g)
2
2
3
Discussion Problems
112. Consider two identical boxes, one containing helium gas and one containing
xenon gas, both at the same temperature. Each box has a small hole in the side
that allows atoms to escape. Which gas will escape faster? Why?
113. Is it easier to drink from a straw at the top of Mt Everest or at the seashore in
Monterey, California? What causes the liquid to move up through a straw?
114. Like any other object that has mass, gas particles are attracted to the Earth by
gravity. Why don’t gas particles in a balloon settle to the bottom of the balloon?
115. When you look at a beam of sunlight coming through the window, you can see
dancing particles of dust. Why are they moving? Why don’t they settle to the
floor?
116. Which of the following statements is/are true about a gas in a closed container?
a. When the particles collide, the temperature rises in the container.
b. When more gas is added to the container, the greater number of collisions
between particles leads to an increase in temperature.
c. If the gas is heated to a higher temperature, the number of collisions per
second between particles will increase.
117. Baking powder contains sodium hydrogen carbonate, NaHCO
, and a weak
3
acid. Why does the reaction between these two components cause a donut to
rise?
118. Use our model for gases to answer the following questions.
a. How does a vacuum cleaner work?
b. Why does a suction cup on a dart cause the dart to stick to a wall? Why
does it help to wet the suction cup first?
c. NASA is developing suction cup shoes for use in space stations. Why will
they work inside the space station but not outside the space station?
119. To ensure that tennis balls in Denver will have the same bounce as tennis balls
along the California coast, manufacturers put different gas pressures in them.
Would you expect the gas pressure to be greater in a tennis ball intended for
Denver or in one for San Francisco? Why?
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