**3**^{rd} Nine Weeks Test Review

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- Calculate the enthalpy from balanced equations.

- Calculate the enthalpy using heats of vaporization and heats of fusion.

- Calculate the change in heat of multiple equations.

- Calculate the heat of formations using standard heats of formations for equations.

- Be able to identify if a reaction is endothermic or exothermic. Explain what is meant by either one.