Question

12. Explain the effect of molecular size and motion on NOE(Nuclear overhauser effect).

The question is from structural biology(NMR spectroscopy).

Answer #1

The size of Nuclear overhauser effect (NOE) is directly proportional to the ratio of magnetogyric ratios of sending and receiving nuclei. For large molecules with high viscosity solvents, molecular motion reduces and become lesser than the Larmor precession frequency. In this situation, negative NOE approaches -100%. Sometimes, it is helpful to manipulate solvent viscosity and temperature to achieve negative NOE's, since these are inherently larger than the positive NOEs seen under conditions of fast molecular motion.

When the molecular weight is around 1000, the NOE effects will be very small, the ROESY experiment can be performed which does not have this limitation.

9. There is slight excess of nuclei in the ground state about a
13 million protons at 100 MHz. Would you expect in the case of
13C NMR same population difference to prevail ?
The question is from structural biology(NMR spectroscopy).

9.(or) 13. Which of the following conditions would be desirable
?
(a) more sample - measurement on a lower MHz spectrometer
(b) less sample - use of a higher MHz NMR spectrometer.
[3marks]
The question is from structural biology(NMR Spectroscopy).

Explain how atomic size and nuclear effective charge are
related.

Develop an effect size measure (round to 2 decimal places) for
Chapter 12 question 27 shown below: In an ANOVA table, the MSE is
equal to 10. Random samples of six were selected from each of four
populations, where the sum of squares total was 250. Numeric
Response?

explain the difference between effect size and confidence
interval.

Explain how number of subjects, effect-size, and statistical
power are related.
- Imagine there is a true effect, state how increasing the
number of subjects can influence statistical power?
- If the number of subjects are held constant, state how an
increase in the size of the true effect influences statistical
power.
- Explain how the type II error rate is different from the type
I error rate.
- State how increasing statistical power influences the type II
error rate.

please explain:
effect size f: 0.1
err prob : .05
power: .8
number of groups: 3
effect size f:
effect size: 0.1
ratio: 1
sample size: 484
number of groups
which one is type one error and type two error?
should i use a smaller sample size?

#1
How does kinetic molecular theory explain Dalton's law?
Select the correct answer below:
Question options:
Gas particles collide with the container with the same frequency
regardless of whether other gases are present.
Gas particles are different sizes and do not contribute equally to
the overall pressure, based on size.
Gas particles contribute to the overall pressure based on their
molar masses.
Gas particles have inelastic collisions, based on their individual
identity.
Question #2
How does kinetic molecular theory explain...

Question 6
A country's Energy Information Administration monitors all
nuclear power plants operating in that country. The table below
lists the number of active nuclear power plants operating in each
of a sample of 10 states.
State
Number of Power Plants
1
5
2
5
3
9
4
8
5
4
6
4
7
2
8
3
9
13
10
3
Eliminate the smallest and largest values from the data set.
Then, find the mean of this data set. (Round...

Using principles of kinetic-molecular theory, briefly explain
the change in volume from 4.0L to 11.2L using a few sentences. Note
that the changes in conditions may not have the same effect on the
final volume (i.e. which one has more of an effect?)

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