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# Test Review - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about ' Test Review' - holt

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Presentation Transcript

### Test Review

Thermodynamics

• Number of collisions

• Concentration of reactants

• Temperature

• Surface area

• Catalysts

• Activated Complex

• Heat of Reaction

• Exothermic vs Endothermic

• Result of a catalyst

• Releases heat

• Sign of DH is negative

• Temperature of the surroundings increases

• Absorbs energy

• Sign of DH is positive

• Temperature of the surroundings decreases

• Solid < Liquid < Gas

• Dissolving a solute into a solvent INCREASES entropy.

• Q = mcDT

• Specific heat (c) = 4.18 J/goC

• Use when you have a temperature change

• Q = mass x heat of fusion

• Used only for a phase change

• NO temperature change

• Sum of products – sum of reactants

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

• Determines whether a reaction is spontaneous.

• DG + is nonspontaneous.

• DG negative is spontaneous.

• DG = DH-TDS

DG = DH - TDS