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Chemistry 14.1

Chemistry 14.1. Due Dates. 04/14 SA 14.1 04/15 SA 14.2 04/15 Do Mini Lab 04/16 Complete Behavior of Gases WS 04/17 Complete Combined Gas Law WS 04/20 Lab 04/21 Computer Lab 04/24 14.3 Due Work on Ideal Gas Law WS 04/27 Ideal Gas Law WS Due Work on A-14

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Chemistry 14.1

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  1. Chemistry 14.1

  2. Due Dates 04/14 SA 14.1 04/15 SA 14.2 04/15 Do Mini Lab 04/16 Complete Behavior of Gases WS 04/17 Complete Combined Gas Law WS 04/20 Lab 04/21 Computer Lab 04/24 14.3 Due Work on Ideal Gas Law WS 04/27 Ideal Gas Law WS Due Work on A-14 04/28 A-14 Due, Work on Study Guide 04/29 Assessment U-14

  3. Pick up unit!!

  4. Compressibility • Compressibility is a measure of how much the volume of matter decreases under pressure. • When a person collides with an inflated airbag, the compression of the gas absorbs the energy of the impact.

  5. Compressibility • Gases are easily compressed because of the space between the particles in a gas. • The distance between particles in a gas is much greater than the distance between particles in a liquid or solid. • Under pressure, the particles in a gas are forced closer together.

  6. Factors Affecting Gas Pressure • The amount of gas, volume, and temperature are factors that affect gas pressure.

  7. Factors Affecting Gas Pressure • Four variables are generally used to describe a gas. The variables and their common units are • pressure (P) in kilopascals • volume (V) in liters • temperature (T) in kelvins • the number of moles (n).

  8. Factors Affecting Gas Pressure • Amount of Gas • You can use kinetic theory to predict and explain how gases will respond to a change of conditions. If you inflate an air raft, for example, the pressure inside the raft will increase.

  9. Factors Affecting Gas Pressure • If the gas pressure increases until it exceeds the strength of an enclosed, rigid container, the container will burst.

  10. Factors Affecting Gas Pressure • Volume • If you increase pressure, volume decreases

  11. Factors Affecting Gas Pressure • When the volume of the container is halved, the pressure the gas exerts is doubled.

  12. Factors Affecting Gas Pressure • Temperature • An increase in the temperature of an enclosed gas causes an increase in its pressure. • As a gas is heated, the average kinetic energy of the particles in the gas increases. Faster-moving particles strike the walls of their container with more energy.

  13. Factors Affecting Gas Pressure • When the Kelvin temperature of the enclosed gas doubles, the pressure of the enclosed gas doubles.

  14. 14.1 Section Quiz. • 14.1.

  15. 14.1 Section Quiz. • 1. Compared to liquids and solids, gases are easily compressed because the particles in a gas • attract each other. • are spaced relatively far apart. • are very small. • repel each other.

  16. 14.1 Section Quiz. • 2. Gas pressure is affected by • temperature, volume, and the amount of the gas. • temperature, volume, and the molar mass of the gas. • phase diagram, volume, and the size of the container. • temperature, phase diagram, and the mass of the gas container.

  17. 14.1 Section Quiz. • 3. For gases, the SI units for volume (V), pressure (P), and temperature (T) are, respectively, • liters, kilopascals, and °C. • liters, kilopascals, and kelvins. • cm3, kilopascals, and kelvins. • liters, atmospheres, and °C.

  18. END OF SHOW

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