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Which of the following will decrease the percentage ionization of 1.0 M acetic acid, CH3CO2H(aq)
A STRONG ACID LIKE HCL, will increase the amount of H+ in solution and thus decrease the percentage of CH3CO2H that ionizes, (Le Châtelier's principle) to identify that adding a strong acid to a solution of weak acid will decrease the amount of ionization of the latter.)
What percentage of standard atmospheric pressure is the pulse pressure of a healthy adult?
pulse pressure in a healthy adult is (120 − 75) mmHg = 45 mmHg, and so the percentage is 45 mmHg/760 mmHg = 6%.
If a homogeneous catalyst cannot be separated from the products at the end of a reaction then
the products will be contaminated with the catalyst.
How will the rate of a catalyzed reaction be affected if the solid catalyst is finely ground before it is added to the reaction mixture?
he rate will be faster because a greater surface area of catalyst will be exposed.
BaCrO4(s) Ba2+(aq) + CrO42-(aq)
exists in a saturated aqueous solution of BaCrO4. Dissolution of Na2CrO4 in a saturated aqueous BaCrO4 solution would:
SHIFT TO LEFT, dissolution of Na2CrO4 would introduce the common ion, CrO42-, which would reduce the solubility of BaCrO4 due to the common ion effect.
volume of solution necessary to provide a given amount of solute in moles,
one needs to take the number of moles and divide by the solution concentration in molarity. EX volume of a 0.120 M CaI2 solution would contain 0.078 mol of the solute? 650 ML
In the chromatography of the reaction mixture, water absorbed on cellulose functioned as the stationary phase. What was the principal factor determining the migration of individual components in the sample?
Hydrogen bonding, the relative amount of hydrogen bonding to the stationary phase will determine the relative rate of migration of the various components in the sample
octahedral compounds have six σ bonds and no lone pairs. According to valence bond theory,
the central atom requires the hybridization of six atomic orbitals, d2sp3.
ratio of the distance traveled by the analyte relative to the solvent front during a chromatographic separation. Aspartic acid travelled two units, while the solvent front travelled ten units, giving an Rf of 2/10 = 0.20 for aspartic acid.
The term "ideal gas" refers to a gas for which certain assumptions have been made. Which of the following is such an assumption?
an "ideal" gas is that it is composed of particles that have negligible volume and do not exert intermolecular forces. PV=nRT
What type of functional group is formed when aspartic acid reacts with another amino acid to form a peptide bond?
the functional group that forms during peptide bond formation is known as an amide group
the rate of substitution of protonated alcohols is subject to
steric hindrance. This inhibits the ability of nucleophiles to collide with the reacting electrophilic center and slows the rate of reaction.
If a solution containing the compounds shown in Figure 4, is injected into a gas-liquid chromatograph, the first peak observed in the gc trace is attributable to which compound
2-methyl-2-butene (one with lowest molecular weight and weakest intermolecular forces. This substance will therefore migrate the fastest and be the first peak in the gas chromatograph (gc) trace
incoming nucleophile displaces the leaving group from the ________ of the reacting center during an SN2 reaction.
In determining which reactant loses the -OH group, which of the following isotopic substitutions would be most useful?
labeling a group which does not exchange with other groups present prior to reaction and will therefore give information about the true identity of the groups, which are exchanged during the reaction.
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