Main difference between phases is… the distance between particles… Unit 11: States of Matter …which depends on two competing factors: Attractions (Attractions.

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Presentation transcript:

main difference between phases is… the distance between particles… Unit 11: States of Matter …which depends on two competing factors: Attractions (Attractions between particles) Kinetic Energy (Kinetic Energy of the particles) vs. GASLIQUIDSOLID

1) have negligible volume (are tiny) compared to the great distance between 2) have negligible attractions because they are so far apart 10 x Kinetic-Molecular Theory 5 Parts of KMT (of Gases)

5 Parts of KMT 4) have perfectly elastic collisions (transfer KE without loss) elastic inelastic 3) are in constant, random motion

5) average KE is directly proportional to temperature ↑ Temp as ↑ KE avg 5 Parts of KMT absolute zero no KE K = o C K 373 K 273 K –273 o C –460 o F

highest KE, expands higher KE, flows low KE, vibrates GAS LIQUIDSOLID compressible video clip

melting freezing vaporization condensation sublimation deposition LIQUID GAS Energy Absorbed Energy Released Phase Changes

freezing: l to s (lose KE) liquid solid + energy melting: s to l (gain KE) liquid solid + energy

boiling: l to g beneath surface evaporation: l to g at surface energy + liquid gas vaporization:

condensation: g to l (lose KE) cold water inside glass condensed drops outside glass ice cubes warm water vapor in air Is water in glass cooler or warmer ? gas liquid + energy

1) According to the kinetic molecular theory, gas particles... A) are attracted to each other. B) are in constant random motion. C) have the same kinetic energy. D) have a significant volume. Quick Quiz!

2) The average kinetic energy of the particles in a substance is directly proportional to the A)molar mass B)density C)temperature D)size Quick Quiz.

3)Compared to liquids and solids, gases are easily compressed because the particles in a gas… A) attract each other significantly B) are spaced relatively far apart C) are extremely small D) move in constant, random motion Quick Quiz.

4)What is –88 o C in Kelvin temperature? A) 185 K B) 361 K C) –361 K D) 273 K K = – K = o C Quick Quiz.

5)Put a cup of water on a table. The process that occurs is… A)evaporation. B)condensation. C)BOTH A and B D)NONE of the above Quick Quiz.