Chapter 2 heating and cooling of naphthalene

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Chapter 2 heating and cooling of naphthalene

  1. 1. The heating curve of naphthalene Temperature ( 0 C) Time (min) Melting point A <ul><li>The particle in solid gain kinetic energy and vibrate more vigrously. </li></ul>B <ul><li>Heat energy is absorbed by the particles in the solid is used to overcome the forces between particles and the solid change to liquid </li></ul>C D <ul><li>The particles in solid begin to melt. </li></ul><ul><li>Its temperature remain constants because the heat energy absorbed by the particles is used to overcome the forces between particles and the solid turn to liquid. </li></ul><ul><li>The particles in the liquid absorbed heat energy and move faster. </li></ul><ul><li>The liquid turn to gas. </li></ul>Heating of naphthalene x x x x x x x x
  2. 5. The cooling curve of naphthalene Discuss with group members the changes that take place in the cooling curve graph, involving the arrangement, the bond and the particles and energy content . (Refer textbook: pg15) Cooling of naphthalene

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