Objective:
Describe the 3 Phases of Water
______
________
_________
Does the ice cool the drink?
Or does the water warm the ice?
-Energy always flows from:
________ to _______.
What is happening to the water
molecules to make it boil?
As Temp. _____
Kinetic energy___
Molecules ______
________________
Look at ESRT page 1
How much energy is needed
(gained) to MELT ice? __________
Phase Changes:
How much energy is gained/released during:
Melting (solid-liquid):
_____ Joules of energy are _________
Freezing (liquid-solid):
_____ Joules of energy are _________
Vaporization (liquid-gas): evaporation
_____ Joules of energy are _________
Condensation (gas- liquid): clouds
_____ Joules of energy are _________
-clouds provide ‘fuel’ for storms by releasing
energy into the atmosphere: ______________
How much energy will 2g of water vapor
release during cloud formation? _________.
-Energy gained/released during a phase
change is called latent heat.
-Latent Heat-“hidden/potential” energy
gained or released during a phase change.
-Temperature does NOT change during a
phase change!!
-Energy is absorbed or released by the
molecular bonds to change it from a solid to
liquid to gas or vice versa.
Between which letters is LATENT HEAT energy
added? How do you know?
Heat Curve for 1g of Water
418 Joules added per minute
HW: Castlelearning & Labs
STUDY: Unit Test FRIDAY!!
EM Spectrum; Energy Transfer:
convection/conduction/radiation.
Specific Heat (calculations)
Sea and Land Breezes (be able to draw)
Greenhouse Effect (be able to draw it)
Phase Changes
Name ________________
Date ______________
Phase Changes of Water
Mrs. Brighton
Earth Science
Heat Curve for 1g of Water
418 Joules added per minute
F
D
B
E
C
A
Answer the following questions based on the graph above, your ESRT and notes. Use the lettered
locations to answer the question, write ALL POSSIBLE LOCATIONS!!
1. When is latent heat being added? __________________________________________________
2. When is latent heat being released? ________________________________________________
3. When are phase changes occurring? _______________________________________________
4. List the differences between Melting and Freezing. _____________________________________
________________________________________________________________________________
5. How many Joules of latent heat are required to evaporate 1g of water? _____________________
6. How many Joules of latent heat are required to evaporate 10g of water? _____________________
7. How many Joules of latent heat are released during condensation? ________________________
8. What is latent heat?_______________________________________________________________
9. Why doesn’t the temperature change during a phase change? _____________________________
________________________________________________________________________________
10. Describe how the arrangement of molecules changes as you travel up the Heat Curve from Ice to
Steam (you can draw pictures).
ICE
LIQUID
GAS
11. State the relationship between phase changes and temperature. __________________________
Define the following terms and specify how much energy is gained OR released. Give real-world
examples when possible.
Melting- _________________________________________________________________________
________________________________________________________________________________
Freezing- _______________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
Vaporization- _____________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
Condensation- ___________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
Latent Heat- _____________________________________________________________________
________________________________________________________________________________
Potential Energy- __________________________________________________________________
________________________________________________________________________________
Kinetic Energy- ____________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________