Chemistry Reference
In-Depth Information
4.
What factors are assumed to be constant, when doing a Boyle's Law
calculation?
5.
A sample of neon gas occupies 200 cm
3
at 4.0 atm. What would be the
volume of this sample at 1.0 atm, assuming the temperature is held
constant?
a) 100 cm
3
b) 200 cm
3
c) 500 cm
3
d. 800 cm
3
6.
A student collects a 4.5 dm
3
sample of hydrogen gas 1.0 atm. If the
temperature remains constant, at what pressure would this sample
have a volume of 9.0 dm
3
?
a) 0.50 atm
b) 1.0 atm
c) 2.0 atm
d) 5.5 atm
7.
A sample of oxygen gas has a volume of 4.0 L at standard
temperature and pressure. If the temperature remains constant, what
would be the volume of this gas at 202.6 kPa?
a) 1.0 L
b) 2.0 L
c) 4.0 L
d) 8.0 L
8.
What volume would a 60 ml sample of neon gas at STP occupy if the
pressure were tripled, while the temperature remains the same?
a) 20 ml
b) 180 ml
c) 3.0 atm
d) 760 torr
9.
If a sample of hydrogen occupies 2.5 L at STP, how much space would
it occupy at 120 kPa, assuming the temperature remains constant?
10. At what pressure would a sample of neon occupy 4.0 L, if it occupies
3.4 L at 720 mm of Hg? Assume temperature remains constant.
Lesson 8-3: Charles's Law
Like Boyle's Law, Charles's Law can explain many phenomenas that
you have experienced in your real life. Maybe you have had the experience
of inflating a pool float to the point where it seems quite firm, and then
throwing it into a cold pool. Then you jump in the pool and climb on top of
the pool float, which no longer seems nearly as firm as it did outside of the
pool. Your first thought might be that the float has sprung a leak. It is
probably more likely that you have simply experienced an example of
Charles's Law, which states that the volume of an ideal gas, at constant
pressure, varies directly with its Kelvin temperature. In simpler terms, this
tells us that when gases get hot, their volumes increase, and when gases get
cold, their volumes decrease. Putting your float in the cold water just made
the volume of the gas inside decrease.
