1) Draw the structure of the product formed by addition of vitamin B1 and benzaldehyde.
2) Ammonia adds to carbonyl groups but is ineffective as a catalyst for the benzoin condensation. Explain.
3) Write a balanced oxidation-reduction equation for the oxidation of benzoin by ammonium nitrate (the cupric ion catalysis need not to be considered).
4) In the benzil oxidation the initial blue color changes to gren as the reaction proceeds. Why?
5) In dilantin sodium it is the imide proton that is abstracted rather than the amide proton. Why?
In: Chemistry
1. Discuss the implications of the spread and change of species distributions after the retreat of the Pleistocene glaciers for evolutionary changes in species and for the species composition of ecological communities.
2. Describe the major mass extinctions over geological time. When did each occur? What was the most probable cause for each mass extinction event? What is the evidence to support each cause? How does the background rate of extinction over most of geological time compare to our current rate of extinction in present time?
In: Biology
write a one page letter to your loan lender,convincing him on how your facility can pay his money. Tell him what your assisted living facility do,
summarizing your financial needs and discussing any assumptions or limitations of your budget. Be sure to also address any unexpected things that might occur (downturn in the economy, policy or legislative changes to insurance, etc.). This written narrative will be given to the commercial lender in support of your application for the loan.
In: Operations Management
Consider an electron initially moving in the positive x-direction along the negative x-axis with an energy E. At the origin the electron encounters a square barrier; the potential energy U (x) changes abruptly, from ? U(x)=0? for x<0, to U ( x) 1.0eV for 0<x<a. to U(x)=0 for x>a, where the barrier width a=1 nm . Graph the transmittance as a function of energy, for the range 0 <E<5eV . For what values of energy is there a transmission resonance?
In: Physics
Consider the following equilibrium for the exothermic reaction: 2NaHSO3(s) <=> Na2SO3(s) +H2O(g) +SO2(g)
How will the equilibrium shift when each of the following changes are made separately? Answer with shift towards products, shift towards reactants or no shift. Provide a reason for your choice.
a.) Adding H2O to the reaction vessel:
b.) Adding Helium to the reaction vessel:
c.) Removing Na2SO3:
d.) Increasing the volume of the reaction vessel:
e.) Increasing the temperature of the reaction vessel:
In: Chemistry
A survey found that women's heights are normally distributed with mean 63.5in and standard deviation 2.2in. A branch of the military requires women's heights to be between 58 in and 80 in.
a. Find the percentage of women meeting the height requirement. Are many women being denied the opportunity to join this branch of the military because they are too short or too tall?
b. If this branch of the military changes the height requirements so that all women are eligible except the shortest 1% and the tallest 2%, what are the new height requirements?
In: Statistics and Probability
A buffer solution contains both a weak acid (HA) and its conjugate base (A-) so buffers do not have large changes in pH after addition of a small amount of strong acid or strong base.
What is the pH of 500.0 mL of a buffer composed of acetic acid (0.300 moles) and sodium acetate (0.200 moles) before and after addition of solid sodium hydroxide (5.84 g)? Assume no change in volume with addition of NaOH. pKa = 4.756 for acetic acid.
In: Chemistry
In matlab.write a program that converts a numerical date given by the user into a month, day, and year. Specifically, the user should input a sequence of eight numbers 05141956.
the program should print out the same date in complete format. In this example it would print "The date is May 14th, 1956". Notice the "th" addition after the day. This changes depending on the number. Make sure this feature is included. MATLAB has built-in date conversion functions. You cannot use them in this exercise.
In: Mechanical Engineering
Answer True or False.
A.1 Open market policy is an effective way of conducting
monetary policy by the Central Bank.
A 2 According to liquidity preference theory, an increase in
interest rates results in a reduction in the prices of securities
resulting in speculators selling them and increasing the
withholding of cash.
A.3 The money supply curve is completely inelastic due to the fact
that it does not depend on income changes.
A 4 The increase in the money supply from the Central Bank has
resulted in the shift of the LM curve to the right.
In: Economics
Compose an essay on the following subject: The world witnessed rapid changing in technology, trade position, political relations, etc., besides there are also occasionally unexpected disturbance in business. Firms are in urgent need to analyze their international business environment to flexibly react and make certain strategic adjustment. Pick up a firm and analyze those critical factors in its international business environment and suggest how the firm should be responsive to those factors and what could be done to react to the rapid changes.
In: Economics