PHASE CHANGES OF WATER & ENERGY

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Presentation transcript:

PHASE CHANGES OF WATER & ENERGY Page 10

LATENT HEAT- energy used to cause a phase change but does not increase the temperature of a substance (hidden heat) Page 10

Heat Energy and Phase Change Page 11

Questions No Yes Heat Energy Particles get further apart Boiling or evaporation or vaporization Page 10

Page 11 Phase Change Diagram Temperature F D E B C A Heat Energy Losing Heat Energy D condensation E evaporation freezing B Gaining Heat Energy C melting A Heat Energy A  B (_______) C  D (_______) solid E F (______) gas liquid

¾ OF THE ENERGY ABSORBED BY EARTH EVAPORATES WATER FROM THE OCEANS EVAPORATION 2260 JOULES/GRAM GAINED The gram of water absorbed 2260 calories of latent heat as it changed to vapor (require addition of energy) COOLING EFFECT CONDENSATION 2260 JOULES/GRAM RELEASED The gram of water released 2260 calories of latent heat as it changed to liquid (give off energy) WARMING EFFECT

Page 12 Found on Page 1 of Earth Science Reference Tables

Check the box which describes whether energy is gained or lost for each process. Process Energy Gained Energy Lost Condensation Evaporation Melting Solidification Page 11

Page 12 How many joules are gained or lost by water for each of the following processes? Process Joules Gained Joules Lost Condensation Evaporation Melting Solidification 2260 2260 334 334

Definition- the amount of energy required to raise the temperature of Page 12 Specific Heat Definition- the amount of energy required to raise the temperature of 1 gram of a substance 1°C Please go to Page 1 of the Earth Science Reference Tables.

Found on Page 1 of Earth Science Reference Tables

Why does water heat up and cool Water has a higher specific heat down slower than land? Water has a higher specific heat Page 12

because it has a lower specific heat If you heated equal masses of basalt and lead, which one would record a faster increase in temperature? Explain how you know. the lead because it has a lower specific heat Page 12

Which Earth material has the greatest specific heat? liquid water Page 12

Discussion Questions Page 13 C A B D C B C A B D