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Heat & Heating Curves Energy Absorbed SOLID LIQUID GAS Energy Released.

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Presentation on theme: "Heat & Heating Curves Energy Absorbed SOLID LIQUID GAS Energy Released."— Presentation transcript:

1 Heat & Heating Curves Energy Absorbed SOLID LIQUID GAS Energy Released

2 Heat If you touch ice, energy passes from _________ into ______.
your hand the ice

3 Heat = “transfer” of thermal energy
80oC heat 20oC It’s incorrect to say matter “contains” heat. Matter “contains” KE and PE. Energy of Motion Stored Energy (moving or vibrating) (bonds & attractions) Thermal Energy Chemical Energy

4 WHY? Describe: The same amount of heat is added to each container, but the temperature of the container with less water increases more. Explain: Temp is higher b/c a measure of _____ KE. avg

5 Ice melts by absorbing heat, but without increasing temperature.
0oC solid  0oC liquid (avg KE stays same) HOW? …by changing phase.

6 added heat breaks IMAFs & increases distance (↑PE)
Heating Curve same temp during phase change (=KEavg) What happens to added heat? vaporize/condense added heat breaks IMAFs & increases distance (↑PE) VLC – media file (Changes of State) melt/freeze

7 Heating Curve of Water KE PE KE PE
heat raises Temp endothermic (↑KE) gas exothermic KE PE boiling 100oC boiling point condensation (↑PE) heat breaks IMAFs liquid Temp (oC) heat breaks IMAFs (↑KE) heat raises Temp (↑PE) melting melting point 0oC freezing freezing point solid (↑KE) heat raises Temp Time (of Heat Added)

8 Heating Curve of Water heat of vaporization heat of fusion
Why is ∆Hvap >>> ∆Hfus? heat of vaporization LG takes more energy to break IMAFs than SL gas (2260 J) 100oC (∆Hvap) heat required to vaporize (or condense) liquid Temp (oC) heat of fusion (418 J) 4.18 J/goC (334 J) 0oC (∆Hfus) heat required to melt (or freeze) solid Time (of Heat Added)

9 The phase change sequence is reversible.
Cooling Curve of Water gas condensation 100oC boiling liquid The phase change sequence is reversible. Temp (oC) freezing 0oC melting solid Time (of Heat Removed)

10 Quick Quiz! Temperature is directly proportional to the _________ of a substance. thermal energy vibrational kinetic energy average kinetic energy total kinetic energy

11 Quick Quiz. Heat is simply another word for _________. temperature internal energy energy transferred from hot to cold thermal energy

12 Quick Quiz. 3. Molecules with stronger IMAFs will have… higher heats of vaporization higher heats of fusion higher boiling points higher melting points higher viscosity higher surface tension ALL of the above

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