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Chemistry

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Heather Tremblay

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Cards in this guide (7)
What happens to a substances temperature during a phase change

The temperature either increases or decreases which causes the different phase changes

How is Hess's law used to measure enthalpy of a desired reaction

... Intermediate equations with known enthalpies are added together.

How is the Hfusion used to calculate the mass of solid that 1kJ of energy will melt

1kJ 1/Hfusion g/mol solid

How does temperature affect spontaneity

If H and S have the same sign, the temperature will determine spontaneity.

How is the Hfusion used to calculate the energy released when a mass of liquid freezes

Grams Liquid x mol/g x Hfusion

How much energy is generated from freezing 2.5g water

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If you need to multiply the following reaction by 2 to be an intermediate reaction in a Hess's law problem what would be the final value for the enthalpy of reaction you use for this intermediate reac

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