1. Which of the following statements is true for ideal gases, but is not always true...
1. Which of the following statements is true for ideal gases,
but is not always true for real gases?
Choose all that apply.
A. Replacing one gas by another under the same conditions, has no effect on pressure.
B. Collisions between molecules are elastic.
C. There are no attractive forces between molecules.
D. Molecules are in constant random motion.
2. Which of the following statements is true for real
gases?
Choose all that apply.
A. As molecules increase in size, deviations from ideal behavior become more apparent at relatively high pressures.
B. Attractive forces between molecules cause a decrease in pressure compared to the ideal gas.
C. Attractive forces between molecules cause an increase in pressure compared to the ideal gas.
D. As molecules increase in size, deviations from ideal behavior become more apparent at relatively low pressures.
3. In general, real gases behave most ideally
at _____highlowtemperatures
and _____highlowpressures.
The behavior of real gases can be described using the van der Waals
equation
[P + (n2a/V2)](V-nb) = nRT
The values of a and b are given below for the two real gases
oxygen and argon.
The gas in which deviations from ideal behavior due to
intermolecular forces are expected to be the
smallest is _______oxygenargon.
The gas that would be expected to behave most like
an ideal gas at high pressures is _______oxygenargon.
|
gas |
a (L2atm/mol2) |
b (L/mol) |
|
O2 |
1.36 |
3.18×10-2 |
|
Ar |
1.35 |
3.22×10-2 |
Homework Answers
Solution:
1) The correct options are: A , B and C.
> Replacing one gas by other is applicable for ideal gases but not for real gases.
>The elastic collision is true for ideal gases not for real gases.
> Force of attraction is negligible for ideal gases but not true for real gases.
x Gas molecules are in constant random motion is true for both ideal and real gases.
2) Option A and C are correct.
Real gases behaves ideally at low pressure and high temperature.
Hence, option B and D are incorrect.
Deviation is more apparent at high pressure.
Attractive forces increases the pressure.
3) Optiona are : high , low
Real gases behaves ideally at high temperature and low pressure.
4) Smalest intermolecular forces in Ar.
Because a =1.35 is lower.
Behaves ideal at high pressure is oxygen.
Because a =1.36 is higher for oxygen.
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