Warm Up #3 How does the kinetic energy and number collisions relate to the temperature? With this logic, how could someone die from hypothermia (being.

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Warm Up #3 How does the kinetic energy and number collisions relate to the temperature? With this logic, how could someone die from hypothermia (being in cold temperatures too long)? 230 kPa = ____ atm? … _____ mmHg? How does pressure relate to elevation? Why does this relationship exist? Name two phase changes (going from one state of matter to another), and describe this phase change.

Properties of Liquids Phase Changes Chapter 13.2 Properties of Liquids Phase Changes

Review: Gasses Kinetic Theory – all matter in constant motion Except absolute zero (0K) Pressure: # collisions/unit volume mmHg, atm, kPa Temp. = DIRECT relationship Elevation = INDIRECT relationship

Liquids Liquids – take shape of container, definite volume More dense than gas More attractive forces at work Liquids = condensed Difficult to compress

Liquids and Pressure…a straw Gases/Liquids prefer moving from HIGH to LOW pressure Sucking action = DECREASES pressure INSIDE straw/mouth Pressure of water draws liquid UP straw into mouth To a point (20 meters)

Siphoning Siphoning – flowing liquids through tubes Atmospheric Pressure pushes liquid up HIGH to LOW pressure Gravity pushes liquid from top of straw into bottom container

Phase Change: Vaporization/Evaporation Vaporization – liquid to a gas/vapor Evaporation – occurs on surface of liquid not boiling MINIMUM kinetic energy required to become gas Lower than that = liquid Evaporation = a cooling process!

Vapor Pressure Boiling in CLOSED container Condensation – gas becoming a liquid Sides of cup of water Equilibrium – a balance Evaporation rate = Condensation rate Boiling Point – temp. when vapor pressure = external pressure Liquid NEVER hotter than this

Boiling Point and Elevation B.P. when vapor pressure = external pressure Normal boiling point = when pressure = 101.3 kPa As elevation increases, pressure decreases Inverse proportion SO As elevation increases, boiling point decreases

Quick Quiz #2 How does the kinetic energy influence the state of matter something will be in? Why are liquids not really compressible? Review: you transfer water from one container, to another container at the same temperature. How will that effect the kinetic energy of the water? Why? Why will the boiling point lower as elevation increases?