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Test Review. Thermodynamics. Factors effecting the rates of reaction. Number of collisions Concentration of reactants Temperature Surface area Catalysts. Potential Energy Diagrams. Activated Complex Heat of Reaction Exothermic vs Endothermic Result of a catalyst. Exothermic Reactions.

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Test review

Test Review

Thermodynamics


Factors effecting the rates of reaction
Factors effecting the rates of reaction

  • Number of collisions

  • Concentration of reactants

  • Temperature

  • Surface area

  • Catalysts


Potential energy diagrams
Potential Energy Diagrams

  • Activated Complex

  • Heat of Reaction

  • Exothermic vs Endothermic

  • Result of a catalyst


Exothermic reactions
Exothermic Reactions

  • Releases heat

  • Sign of DH is negative

  • Temperature of the surroundings increases


Endothermic reactions
Endothermic reactions

  • Absorbs energy

  • Sign of DH is positive

  • Temperature of the surroundings decreases


Entropy
Entropy

  • Solid < Liquid < Gas

  • Dissolving a solute into a solvent INCREASES entropy.


Specific heat calculations
Specific Heat Calculations

  • Q = mcDT

  • Specific heat (c) = 4.18 J/goC

  • Use when you have a temperature change


Calculating heat of fusion
Calculating heat of fusion

  • Q = mass x heat of fusion

  • Used only for a phase change

  • NO temperature change


Calculating heat of reaction
Calculating Heat of Reaction

  • Sum of products – sum of reactants

  • H = nHf(products) - mHf(reactants)


Calculating d g
Calculating DG

  • Determines whether a reaction is spontaneous.

  • DG + is nonspontaneous.

  • DG negative is spontaneous.

  • DG = DH-TDS


D g d h t d s
DG = DH - TDS


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