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Heating Curve

Heating Curve. evruC gnitaeH. Explain the plateau of heating and cooling curves. Include: IMFs, exothermic, endothermic Define melting and boiling point in terms of intermolecular forces and particle size. Additional KEY Terms. Heating Plateau :

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Heating Curve

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  1. Heating Curve evruC gnitaeH

  2. Explain the plateau of heating and cooling curves. • Include: IMFs, exothermic, endothermic • Define melting and boiling point in terms of intermolecular forces and particle size. • Additional KEY Terms

  3. Heating Plateau: Minimum amount of energyis needed to overcome the intermolecular forces–endothermic process. Alladded heat is used to overcome these forces, NOTincrease kinetic energy (temperature). Plateau ends when all particles have phase changed.

  4. Cooling Plateau: Particles lose energy and slow down - pulled together by the IMFs. Organizing into restrictivephasescauses the releaseof stored energy– exothermic process Freezing of Water Freezing Point Plateau ends when all particles have phase changed.

  5. Freezing of Water Freezing Point

  6. Melting and boiling points are a characteristicphysical property. Generally, as mass increases, melting/boiling point also increases. (more intermolecular forces to work against)

  7. Ionic compounds typically have higher melting point than molecular compounds. NaCl 801oC Sugar 160oC

  8. IMFs must be overcome in order for a substance to change states/phases. The greater the forces between the particles, the more energy needed to overcome these forces. O H H O H H Na+ Na+ Cl- Cl- So, the greater the IMFs, the higher the melting and boiling point.

  9. CAN YOU / HAVE YOU? • Explain the plateau of heating and cooling curves. • Include: IMFs, exothermic, endothermic • Define melting and boiling point in terms of intermolecular forces and particle size. • Additional KEY Terms

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