Indicate, by letter(s), the position(s) on the ring at which
substitution occurs when the aromatic compounds...
Indicate, by letter(s), the position(s) on the ring at which
substitution occurs when the aromatic compounds shown undergo
bromination with Br2, FeBr3 (when
necessary).
What is the expected aromatic
hydrocarbon reactivity of these compounds and why ? (which is the
fastest and which is the slowest and why?) a bromine solution in
acetic acid was added to these compound.
Toluene , Acetanilide , Benzhydrol, Anisole, Diphenyl ether
What precautions must be taken when using concentrated
acids?
(a) At what position will electrophilic aromatic substitution
occur for the following compounds?
bromobenzene
nitrobenzene
benzoic acid
toluene
phenol
benzaldehyde
(b) In the list above, which compound is the most reactive?
Briefly explain.
(c) Which compound is the least reactive? Briefly explain.
3. Using the quantities given in the Procedure, calculate the
theoretical yields for the mononitration of (a) acetanilide and (b)
methyl benzoate. Record your results here and in your...
For each of the following compounds, indicate the pH at which
50% of the compound will be in a form that possesses a charge and
at which pH more than 99% of the compound will be in a form that
possesses a charge.
CH3COOH (pKa = 4.76)
CH3NH+3 (pKa = 10.7)
Determine a pH at which pH more than 99% of CH3COOH will be in a
form that possesses a charge. Express your answer using two decimal
places.
In each of the circumstances listed below, indicate, by
appropriate letter, which of the following types of opinions should
be rendered on the entity's financial statements?
Mix and match Each question should have a Letter by it (some
answers will apply to multiple questions)
A. Unmodified
B. Qualified
C. Adverse
D. Disclaimer
___ 1. Departure from generally accepted accounting principles
that is material but not pervasive.
___ 2. Going-concern uncertainties that may have a material (but
not pervasive) effect on...
Indicate whether each of the following compounds will gave an
acidic, basic or neutral solution when dissolved in water.
Clear All
ammonium bromide
barium cyanide
potassium chloride
potassium bromide
The pH will be less than 7.
The pH will be approximately equal to 7.
The pH will be greater than 7.
8. Draw a flow diagram for this experiment. Indicate which phase
contains each of the compounds in the mixture.
10. Why is it essential to carefully separate the layers during
an extraction? What would happen if the layers were not separated
completely?
11. You are given an impure solid that contains 70% of the
desired product. After extracting 15 g of the material, you recover
6 g of the pure compound. What is the correct recovery?
12. how extraction works...
When t = 0, the position of a point is s= 6m, and its velocity
is v= 2m/s. From t = 0 to t= 6s, the acceleration of the point is a
= 2+ 2t2 m/s2 .From t = 6s until it comes to
rest, its acceleration is a = -4m/s2
a.) What is the total time of travel?
b.) What total distance does the point move?
Which of the following occurs in photoreceptors when they are
exposed to the appropriate wavelength of light?
Opsin and all-trans retinal combine to form rhodopsin.
PDE enzyme is activated, which increases cGMP levels.
Light-gated Na+ channels open, which depolarizes the cell.
cGMP levels decrease, which closes Na+ channels and
hyperpolarizes the cell.
Which of the following would indicate an improvement in a
company’s financial position, holding other things constant? a. The
inventory and total assets turnover ratios both decline. b. The
total debt to total capital ratio increases. c. The profit margin
declines. d. The times-interest-earned ratio declines. e. Days
sales outstanding decreases.