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MCAT Chemistry
A brief overview of some subjects presented in the Chemistry section.
8
Chemistry
Undergraduate 1
01/20/2010

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Cards

Term
When calculating the enthalpy change of a reaction, does the stoichiometry of the reaction matter?
Definition
Yes, it does. Enthalpy is an extensive process, so quantity does matter.
Term
What is the equation for the change in enthalpy?
Definition
ΔH=ΔU+PΔV and ΔH(rxn)=ΔH(products)- ΔH(reactants)
Term
Removing heat from an exothermic reaction will increase or decrease the product formation? An endothermic reaction?
Definition
Removing heat will push the exothermic reaction toward the products since heat is a product and is removed according to Le Chattle's principle. Removing heat from an endothermic reaction would slow the reaction and bring it toward products.
Term
What is more exothermic: a phase transition or a chemical reaction?
Definition
A chemical reaction will (in most all cases) be more exothermic than a phase change (eg. moving from liquid water to vapor water).
Term
What is the equation for the change in gibbs free energy?
Definition
ΔG=ΔH-TΔS
Term
The solubility product constant of mercury(I) iodide is 1.2x10^-28 at 25 degrees. Estimate the concentration of mercury ions and iodide ions in equilibrium with solid mercury(I) iodide?
Definition
[I-]=6x10^-10 mol/L, [Hg22+]=3x10^-10 mol/L
Term
What is the concentration of hydroxide ions in a saturated Ba(OH)2 solution? The Ksp=4x10^-3
Definition
2x10^-1 M
Term
What is Raoult's law?
Definition
An ideal solution with some non-volatile solute dissolved in it will have a linear vapor pressure depression depending on the mole fraction of the solvent: P(final)=X(solvent)P(stp)
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