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unit-4-review-answers

unit-4-review-answers - Answers to Unit 4 Review Gases...

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Answers to Unit 4 Review: Gases Answers to Unit 4 Review: Gases 1. Solid: fixed shape, incompressible. Liquid: takes shape of container, incompressible. Gas: expands to fill container, compressible. 2. Vibrational (solids, liquids, gas molecules) , rotational (liquid, gas) , translational (liquid, gas) . 3. a) The fastest molecules in a liquid leave the surface. This lowers the average kinetic energy (energy of movement). Recall average kinetic energy = temperature. b) gases have large spaces between molecules. c) Pressure is caused by collisions of molecules against the side of a container. A high temp. causes molecules to move faster. The # of collisions and their strength increases.
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4. Gas molecules move very fast (at the speed of a bullet). Yet, they will not diffuse at this speed because other molecules get in the way. At a high pressure, the rate of diffusion slows down because more molecules are in the way. 5. STP: standard temperature and pressure (0°C, 101.3 kPa). SATP: standard ambient temperature and pressure (25°C, 100 kPa).
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