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CP Assessment #1
Chemistry (General & Organic)
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The characteristic structural feature of a hemiacetal is a carbon atom bonded to an -OH group and an -OR group.
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1 point
False
True
In the formation of LiF during exposure of lithium crystal to fluorine gas, fluorine undergoes reduction by acquiring an electron.
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False
True
Reaction with acidified potassium dichromate could be used to convert oxaloacetate into malate.
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True
False
If addition of a catalyst decreases the activation energy of a chemical reaction from 80 kJ mol-1 to 40 kJ mol-1, the rate of the reaction at standard temperatures will be doubled.
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False
True
The molecular formula of sodium chloride is NaCl, so each molecule contains one atom of sodium and one atom of chlorine.
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False
True
Deflection of α particles in Rutherford's gold foil experiements occurred due to repulsions between positively charged α-particles and positively charged gold nuclei.
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True
False
Although there is no hydrogen bonding in pure acetaldehyde, it is miscible with water due to hydrogen bonding.
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False
True
HCl is a stronger acid than H3O+.
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False
True
On an atomic spectrograph for a particular atom all spectra correspond to an amount of energy that less than or equal to the ionization energy of that atom.
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False
True
Crowding around the carbon holding the leaving group reduces the rate of SN2 substitution by increasing activation energy.
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True
False
The electron affinity of chlorine is primarily responsible for the stability of NaCl.
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True
False
The cell potential for a redox reaction is the sum of the reduction potentials of cathode and anode reactions.
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True
False
Br79 has a natural abundance of 50.69%. Br81 has a natural abundance of 49.31%. For this reason, the mass spec of dibromomethane will contain two molecular ion peaks of approximately the same height.
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False
True
In determining the oxidation number for an atom within a molecule, electrons in each bond are assigned to the more electronegative element.
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True
False
In the phosphorylation mechanism with tyrosine, serine, or threonine kinase, the hydroxyl group of the amino acid residue of the kinase substrate protein performs as a nucleophile in a phosphoryl transfer reaction.
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1 point
False
True
Increasing the intensity of the incoming light will increase the energy but not the number of electrons emitted in the photoelectric effect.
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False
True
Steric hindrance is a significant barrier to the SN2 reaction.
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True
False
A solution where [H3O+] = 3 × 10-5 has a pH of approximately 4.5.
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True
False
In KNO3 (potassium nitrate) the oxidation number of nitrogen is +5.
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False
True
The carbon in a nitrile group is double-bonded to nitrogen and sp2 hybridized.
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False
True
When light is incident on a metal surface, whether or not the photoelectric effect occurs will depend on the intensity of the light source.
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True
False
In biological phosphoryl transfer reactions the electrophilicity of the phosphorus atom is often enhanced by the Lewis acid effect of one or more calcium ions.
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True
False
At the melting point of water, the free energy of liquid water equals the free energy of ice.
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False
True
The empirical formula for hydrogen peroxide is H2O2.
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True
False
CO2 is a polar molecule.
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True
Sodium atoms are larger in size than chlorine atoms.
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False
True
Reaction with excess LiAl4 in THF converts acetoacetate into β-hydroxybutyrate.
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True
False
The number of donor atoms in a chelate complex equals the number of ligands.
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False
True
To formulate a 0.5M solution of KOH, you would add 0.5mol KOH to 1 liter of water.
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False
True
In the mechanism of a chemical reaction, the activated complex is a species that is created in one elementary step and destroyed in a subsequent step.
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False
True
A polyatomic molecule will be nonpolar only if its bonds are nonpolar.
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False
True
Water is a good solvent for SN1 substitution to form an alcohol.
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False
True
Alcohols are ideal substrates for SN1 and SN2 substitution reactions.
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True
False
The pKa of an acid increases with increasing temperature, indicating that the dissociation of the acid is endothermic.
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False
True
A chemical reaction would occur if solutions of CuCl2 and NaOH were mixed.
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True
False
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E2 elimination would likely be favored in the reaction of a strong, hindered base with a secondary alkyl halide.
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False
True
The heat of vaporization represents the increase in the internal energy of a substance in transforming from a liquid to a gas.
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True
False
Phosphoryl transfer onto the hydroxyl group of tyrosine in a tyrosine kinase is a nucleophilic substitution mechanism with ADP as the leaving group.
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True
False
In UV spectroscopy absorbance of incident radiation is proportional to both the path length and concentration of the absorbing species.
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True
False
Methanethiol has a lower boiling point than methanol.
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True
False
If 9.0 g of water are decomposed, 1.0 g of hydrogen and 8.0 g of oxygen are obtaiined.
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False
True
A nonideal solution of two liquids is one where the total vapor pressure is lower or higher than predicted by Raoult's law.
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False
True
If the standard free energy change for an enzyme catalyzed biochemical reaction is positive, the reaction must be coupled with a second spontaneous reaction in order to proceed in the forward direction.
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True
False
Moving at the same speed, a proton has a shorter de Broglie wavelength than an electron.
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True
False
Although cis 1,2-dichloroethene has a higher boiling point than trans 1,2-dichloroethene, it has a lower melting point.
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False
True
The ionization energy of nitrogen is larger than that of oxygen.
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True
False
The four-membered lactam of penicillin is spontaneously esterified by transpeptidase active site serine without ATP cleavage despite the general tendency for amides to be more stable than esters.
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False
True
As bond order between atoms of the same pair of elements increases, bond length decreases, bond energy increases, and vibrational frequency increases.
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True
False
Strong field ligands are more likely to produce low spin coordination complexes.
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False
True
Fe2(SO4)3 dissociates in aqueous solution into Fe3+(aq) and SO42-(aq) ions. The sulfate ions will be solvated by water and the iron ions will form the hexaaquairon(III) complex, [Fe(H2O)6]3+. The solution will be acidic.
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False
True
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When the volume of the reaction vessel is decreased in which N2O4 (g) (dinitrogen tetroxide) is at equilibrium with NO2 (g) (nitrogen dioxide), this will decrease the value of the equilibrium constant causing the reaction shifts to the left to find the new equilibrium.
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False
True
When lithium iodide is added to water the mixture becomes warm, signifying that the solution process in this case is endothermic.
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True
False
When the solvent is water the concentration of a 1 molar solution is equal to the concentration of a 1 molal solution.
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True
False
In the case of H2O and NH3, the H-X-H bond angles are equal to the tetrahedral angle of 109° that is observed in the molecule CH4.
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True
False
If the nucleophile in acyl substitution upon a highly activated carboxylic acid derivative is inorganic phosphate, the product is a phosphate ester.
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False
True
Schiff base formation involves the reaction of a secondary amine with an aldehyde or ketone.
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True
False
Within an HNMR sample in an applied spectrometer magnetic field, the protons of the reference standard trimethylsilane (TMS) precess at a higher frequency than the protons of almost any organic molecule.
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False
True
A β-keto acid is a substance possessing a carbonyl group on the carbon adjacent to the carboxyl group.
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False
True
A Brønsted-Lowry base must have at least one nonbonding electron pair.
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False
True
Atoms on the far left side of the periodic table are generally less electronegative than atoms on the right side of the periodic table.
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1 point
False
True
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