What is the basic reaction by which biological monomers form
polymers?
A. hydrolysis
B. dehydration
C. mechanical displacement
If the environment surrounding a cell has a lower concentration
of dissolved substances than the cell, the
A. environment is isotonic to the cell
B. environment is hypertonic to the cell
C. cell will not experience a net gain or loss of water
D. environment is hypotonic to the cell.
E. cell will die
Cell theory states that
A. life is spontaneously...
What is the difference between Addition and Condensation
reactions? How does this relate to polymers?
Write a balanced nuclear equation for the following:
When iridium-192 emits a beta particle as it decays
Compare and contrast the molecular structure and performance
characteristics of LDPE and HDPE. Provide an example of each type
of polymer
Describe two types of methods that can be used to mold plastic
products.
Tin (Sn), with a mass number of 126 and an atomic number of 50,...
Experiment - Claisen Condensation
Reactions:
In this experiment, we performed a Claisen condensation reaction
of ethyl phenylacetate using potassium tert-butoxide to form ethyl
3-oxo-2,4-diphenylbutanoate and ethanol without using a solvent.
This allowed us to reduce waste, have reagents that have a
relatively low toxicity level, and made the reaction much more
convenient.
Question 2: If this reaction were run in a
solution (as opposed to solvent-free) it would require several
hours of refluxing and provide a much smaller yield. Why...
1. In the dibenzylideneacetone synthesis by an aldol
condensation procedure
a) Explain why it is not necessary to acidify and warm in the
final step of the reaction
b) Explain why a mixture of products is not obtained in this
cross-aldol reaction and reflect on the stereochemistry of the
product around the double bond.
c) State the solubility of dibenzylideneacetone in different
solvents as this influences the experimental procedure.
If you can distinguish between addition and condensation
polymers, then you can figure out what the monomers are. Describe
how you would do this for the three kinds of polymers.
In general, condensation polymers have higher monomer feedstock
costs but lower capital costs to synthesis. False or
True.
Above the critical degree of polymerization, molecular weight
largely governs the mechanical properties of the polymer. True or
False.
A and B are monomers polymerized to form the following
copolymer:
A-A-B-A-B-B-A-A-A-B-A-B-A-A-B-B-B-B.
This is an example of a block copolymer. True or
False
Engineering Thermoplastics are a class of polymers which are
generally more expensive than commodity
polymers. True or
False.
The processes...
Substance C is formed at 600K from A and B according to the
reaction below:
A + B -> C
A 0.500 L pressure vessel is loaded with 0.350 mol of A and
0.350 mol of B. What are the concentrations of all three substances
at equilibrium, Kc=4.95 at 600K?