Math
Approximately how many Cr atoms are present in 3 moles of Cr2O72–?
3.6 × 1024
This binds to the active site along with the substrate in order to catalyze an enzymatic reaction.
cofactor
The distribution of electrons evenly in a molecule contributes to stability. This accounts for:
resonance
What is the number of completely filled orbitals in a ground-state atom with 6 protons?
2
This refers to the transition directly from a solid to a gas.
sublimation
A nugget of gold with a mass of 521 g is added to 50.0 ml of water. The water level rises to a volume of 77.0 ml. What is the density of gold?
19.3 g/ml
What would be the charge of glutamic acid at pH 7?
What would be the result of increasing the number of nucleophiles in a SN1 reaction?
increase, decrease, have no effect?
It would have no effect. SN1 reactions are substitution reactions that depend on reagents attracted to electrons (electrophiles). SN1 reactions do not depend on the number of nucleophiles involved in the reaction. Consequently, altering the concentration of nucleophiles does not alter the rate of reaction.
Which type of reaction is shown below?
2NaNO3 (s) → 2NaNO2 (s) + O2 (g)
Decomposition
This refers to two compounds that resist a change in the pH of a solution.
Buffer solution
Mg3N2 + 6H2O → 3Mg(OH)2 + 2NH3
How many moles of ammonia are liberated when 2 moles of Mg3N2 is reacted with 9 moles of H2O?
3
Which nutrient yields the most energy per unit?
Fat
The addition of HBr with peroxide and an alkene yields what product?
Markovnikov’s product
anti-Markovnikov’s product
Sayteffs product
the ortho product
anti-Markovnikov’s product
HBr plus an alkene yields Markovnikov’s product. But, in the presence of peroxide, the result of the reaction is an anti-Markovnikov’s product.
Which of the following compounds has the strongest electrostatic interactions between the constituent particles?
NH3, PCl5, NaCl, or NO2
NaCl
An electron pair donor is also known as
lewis base
An ideal gas has a pressure of 15 psi and a temperature of 400 K. If the volume of the gas is reduced from 3 liters to 2 liters at constant pressure, what is the final temperature of the gas?
*hint* leave as fraction
267 K
In a single strand of a nucleic acid, nucleotides are linked by
phosphodiester bonds
Which of the following alcohols is the most easily dehydrated?
A. (CH3)3C−OH
B. (CH3)2CH−OH
C. CH3CH2−OH
D. CH3−OH
A. (CH3)3C−OH
Classify the alcohols as primary, secondary, or tertiary: (A) is tertiary because the −OH group is directly attached to 3 alkyl groups; (B) is secondary because the carbon attached to the −OH is connected to 2 carbon atoms; (C) is primary because the carbon connected to the −OH group is connected to 1 carbon atom; and although (D) lacks an attached alkyl group, it is considered primary. As tertiary alcohols form the most stable carbocations, (A) is correct.
550 nm electromagnetic radiation is in what region of the electromagnetic spectrum?
Visible
What is the pH of a one liter solution containing 23.6 g of HCl in water?
0.19
The MW of HCl is 36.5 g/mole
23.6 g is 0.647 mole HCl
0.647 mole/ one liter so [0.647 M]
pH = -log[0.647] = 0.19
A mixture consists of 3 moles of N2, 2 moles of O2 and 2 moles of Xe. At 298 K, the gas has a pressure of 5 atm. What is the partial pressure of xenon in this mixture?
10/7 atm
In animals, consuming glucose causes insulin release from the pancreas, which causes the liver and muscles to take in glucose from the blood stream. This is an example of
negative feedback
A compound is particularly stable if all of its bonding molecular orbitals are filled with paired electrons. This is true of aromatic compounds, meaning they are quite stable. With aromatic compounds, 2 electrons fill the lowest energy molecular orbital, and 4 electrons fill each subsequent energy level (the number of subsequent energy levels is denoted by n), leaving all bonding orbitals filled and no anti-bonding orbitals occupied. This gives a total of 4n+2 ππ electrons.
Name is theory/rule
Huckel's Rule
What is the molecular geometry of SiF4
tetrahedral
A sugar molecule whose acyclic form is a five-membered oxygen-containing heterocyclic ring is called..
a furanose
(furan = a five-membered oxygen heterocyclic compound, a sugar that has the same basic skeleton is a furanose)