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B. Heating Curves

Gas - KE . Boiling - PE . Liquid - KE . Melting - PE . Solid - KE . B. Heating Curves. B. Heating Curves. Temperature Change change in KE (molecular motion) depends on heat capacity. Heat Capacity energy required to raise the temp of 1 gram of a substance by 1°C

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B. Heating Curves

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  1. Gas - KE  Boiling - PE  Liquid - KE  Melting - PE  Solid - KE  B. Heating Curves

  2. B. Heating Curves • Temperature Change • change in KE (molecular motion) • depends on heat capacity • Heat Capacity • energy required to raise the temp of 1 gram of a substance by 1°C • Specific heat - different values for each substance

  3. B. Heating Curves • Phase Change • change in PE (molecular arrangement) • temp remains constant • Heat of Fusion (Hfus) • energy required to melt 1 gram of a substance at its m.p. • Hfus of ice = 6.009 kJ/mol

  4. B. Heating Curves • Heat of Vaporization (Hvap) • energy required to boil 1 gram of a substance at its b.p. • Hvap for water = 40.79 kJ/mol • usually larger than Hfus…why? • EX: sweating, steam burns

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