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Understanding Phase Changes: Exothermic and Endothermic Processes

This document explores the classification of phase changes into exothermic and endothermic processes, including melting, freezing, vaporization, condensation, sublimation, and deposition. It explains how these changes relate to molecular motion and energy transfer. Additionally, it includes two graphs illustrating heat versus time for both exothermic and endothermic processes, with detailed explanations for their shapes. The unique behavior of evaporation is also discussed, emphasizing its energy-neutral characteristics during the phase change.

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Understanding Phase Changes: Exothermic and Endothermic Processes

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  1. Thermochem HW 1

  2. Separate by exothermic and Endothermic • Melting • Freezing • Vaporization • Condensation • Sublimation • Deposition

  3. Explain • Explain why you grouped the phase changes the way you did. • Base your explanations around molecular motion.

  4. Draw and explain • Draw 2 graphs with heat on the y-axis and time on the x-axis. • Draw 1 for an exothermic process and 1 for an endothermic process. • Explain the reason for why you drew each graph the way you did. • 1 Paragraph each

  5. Not exo- or endo- thermic • Evaporation – explain how this process does not release or absorb energy?

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