What makes the statement: Water

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What makes the statement Water boils at 96ºC
wrong?
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Boiling point has just as much to do with
PRESSURE as TEMPERATURE! This statement leaves
off how much pressure the water is under.
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A PRESSURE COOKER
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15
What is the normal boiling point of water?
NORMAL
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(No Transcript)
5
16
What is the term for the temperature at which a
substance changes phase from a. a solid to a
liquid? b. a liquid to a solid?
melting point freezing point
http//cwx.prenhall.com/petrucci/medialib/media_po
rtfolio/text_images/031_ChangesState.MOV
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A substance must have a melting point to be a
true solid.
That is why glass is actually a liquid
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How does the average kinetic energy of the
particles of a solid compare with the average
kinetic energy of the particles of a liquid at
the SAME TEMPERATURE?
Even though particles can be in different
phases (liquid, solid, gas, etc.) They can be at
the same temperature. However, at the same
temperature, the solid has the least kinetic
energy. the gas the most kinetic energy.

• Which one of these molecules
• of H2O would represent
• the kinetic energy of ice?
• of water?
• of vapor?

http//www.mhhe.com/physsci/chemistry/chang7/esp/f
older_structure/cl/m2/s2/index.htm
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Why does the temperature remain constant in a
mixture of ice and water while heat is being
supplied to melt the ice?
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http//www.mmartins.com/mmartins/animations/
Because while the ice is melting, all the energy
is going into the process of MELTING the ice.
When all the ice is melted, the temperature is
free to rise again.
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20
Why does a boiling liquids temperature remain
constant?
While boiling is taking place, all the energy is
going into breaking bonds between water
molecules.
http//www.dac.neu.edu/physics/b.maheswaran/phy112
1/data/ch04/anim/anim0405.htm