Example a sample of hydrogen h 2 was found to effuse

This preview shows page 31 - 41 out of 41 pages.

Example: A sample of hydrogen, H2, was found to effuse through a pinhole 5.2 times as rapidly as the same volume of unknown gas (at the same temperature and pressure). What is the molecular weight of the unknown gas?Gas Diffusion and Effusion: Graham’s Law31
The Behavior of Real GasesAll actual gases are real gases.They dont follow the ideal gas law exactly, especially as pressure increases.Gases can be compressed to liquids, and this suggest that gas molecules DO attract one another.Liquids are very difficult to compress, and this suggests that powerful repulsive forces are present.32
All deviations from ideality can be explained by the presence of ___________________, or attractions and repulsions between molecules.All molecules attract one another when they are a few molecular diameters apart but repel one another as soon as their electron clouds come into contact (assuming they do not react).33The Behavior of Real Gases
The Behavior of Real Gases• The ______________________ accounts for the behavior of real gases (i.e., gases at high pressure and low temperature).34P + n2aV2æèçöø÷V-nb()=nRT
Greenhouse GasesGreenhouse gases absorb infrared (IR) radiation. Whether or not molecules of a gas absorb IR radiation depends bond vibrations.35
Greenhouse GasesThink of molecular bonds like a spring that can stretch and retract.36Figure 10.21
Greenhouse GasesIn a polyatomic molecule like CO2, vibrations occur in different directions.37
Greenhouse GasesMolecules absorb IR radiation if:38
Greenhouse GasesIn carbon dioxide:
Greenhouse GasesGlobal-warming potential(GWP) is a relative measure of how much heat a greenhouse gas traps in the atmosphere on a per mass basis.41

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture