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

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

added heat breaks IMAFs & increases distance (↑PE) Heating Curve same temp during phase change (same KEavg) What happens to added heat? vaporize/condense added heat breaks IMAFs & increases distance (↑PE) melt/freeze

Heating Curve of Water KE PE KE PE handout 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 Heat Added (or Time)

Heating Curve of Water heat of vaporization heat of fusion handout 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) q = mcDT (c = 4.18 J/goC) (334 J) 0oC (∆Hfus) heat required to melt (or freeze) solid Heat Added (or Time)

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 Heat Removed (or Time)

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Quick Quiz! Complete WS 1 #3-8 Complete WS 2