MAIN FORMULAS!!!

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$q = mC\Delta T$

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m is mass (GRAMS) , C is specific heat capacity & $\Delta T$ is change in temperature (CELCIUS or KELVIN)

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$q = \Delta H * n$

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where n is moles, $\Delta H$ is change in Enthalpy

OR

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$q = \Delta H*m$

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where m is mass (GRAMS)

Also that random formula from the reading (5.1)

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$E_{el} = \frac {kQ_1Q_2} {d}$

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$E_{el}$ is Electrostatic potential energy, $Q_1$ and $Q_2$ are the 2 charges, $d$ is the distance and $k$ is a proportionality constant of $8.99*10^9$

Definition

• Heat exchange associated with any bond changes, including phase changes and chemical reactions

Exothermic VS Endothermic

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Energy Released = Exothermic

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Energy absorbed = Endothermic

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Information

• chemical and phase changes have corresponding enthalpy changes

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Breaking Bonds = Endothermic

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Forming Bonds = Exothermic

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