Period 3 Advanced Chemistry

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Presentation transcript:

Period 3 Advanced Chemistry Bell Task-Determine the type of intermolecular force present in each of the following. check quizzes with each other! A. CH3OH B. CH3CH2CH3 Agenda: Bell Task and review Weekly agenda Review quizzes from last week Phase Diagrams

Period 3 Advanced Chemistry Bell Task- Identify the following statements as endothermic or exothermic reactions and identify the sign of delta H and delta S. 1. Carbon Dioxide subliming 2. N2 gas condensing 3. Ethanol evaporating 4. Sodium Thiosulfate liquifying 5. Water crystallizing

Examples of Phase Changes Phase Change (State Change): A change in physical form but not the chemical identity of a substance. Fusion (melting): Vaporization : Sublimation: solid to liquid liquid to gas solid to gas Freezing: Condensation: Deposition: liquid to solid gas to liquid gas to solid

When randomness increases, S with + (endothermic) H = Enthalpy which is associated with heat flow and making or breaking the attractiions that hold liquids and solids together (+) = endothermic reaction (-) = exothermic reaction S = Entropy and is the measure of disorder When randomness increases, S with + (endothermic) When randomness decreases, S with - (exothermic) G= Gibbs Free Energy and is thought as the maximum amount of work obtainable from a reaction and is an indicator of spontaneity! This formula helps determine the temperature at which a change occurs! when delta G = 0 helps calculate the temperature when two phases are in equilibrium!

Question: In terms of intermolecular forces, why are Hf and Hv so different? Hf- Hv- Values

Prove that water melts at 273K using Free Energy Change calculation

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For phase changes that are endothermic delta H and delta S are + For phase changes that are exothermic delta H and delta S are -

Phase Changes

Heat (Enthalpy) of Fusion (DHfusion ): The amount of energy required to overcome enough intermolecular forces to convert a solid to a liquid. Heat (Enthalpy) of Vaporization (DHvap): The amount of energy required to overcome enough intermolecular forces to convert a liquid to a gas.

Phase Changes

Enthalpy