|
In this experiment column chromatography, two different elution solvent systems were used. Why? If their order had been reversed (i.e., 20:80 EtOAc–Hex was used first), how would the separation of the fractions have changed? |
In: Other
As GC content increases, the value for the Gibbs free energy of melting _______, which indicates that the reaction becomes more __________.
A. decreases; exergonic
B. increases; exergonic
C. decreases; endergonic
D. increases; endergonic
8. Therefore, the thermodynamic parameters indicate that the _______ of duplex DNA is enthalpically opposed and entropically favored, while the _________ of duplex DNA is enthalpically favored and entropically opposed (hint: see the discussion of entropy in Chapter 1).
A. melting; formation
B. formation; melting
In: Other
the farm security administration of u.s. department of agriculture
a. encourages future farmers of America to photograph activities relate to Everyday farming and rituals of life
b. owned controlling shares of Eastman kodak company
c. paid photographers to document the Great Depression
d. sponsored photography classes in high school cross country
In: Other
One mole of ideal gas, initially at 50OC and 1 bar, is changed to 150oC and 4bar by 2 different mechanically reversible processes as follows:
process 1: the gas is first heated at constant pressure until its temperature is 150oC and then it is compressed isothermally to 4 bar
process 2:the gas is first compressed adiabatically to 4bar and then it is cooled at constant pressure to 150OC
i)Assume Cv =2.5R and Cp=3.5R, estimate the heat(J) and work(J) for both processes
ii)Select the most energy efficient process.Justify your answer.
In: Other
Which core step of the so-called ‘Central Dogma’ (DNA replication; transcription; or translation) do therapies like RNAi regulate?
In: Other
Risk Management and Insurance 2nd Edition Chapter 11 Problem 1 Solution. Can you explain how to do this problem? How did you come up with the marginal cost and marginal benefit numbers?
Thank you,
Sam
In: Other
What do archeologist do?
What are the goals of archaeology?
What is of value to archaeology?
In: Other
What is the primary goal of capitalism? What is the primary goal of socialism? What do you think are the pros and cons of each?
In: Other
What is Saltwater intrusion ?
What causes this problem ?
What measures could be taken to prevent this?
In: Other
What is biodiversity? Describe three levels of biodiversity. What are the benefits of biodiversity? What are the five primary causes of biodiversity loss? Give specific examples of each. What is a biodiversity "hot spot”?
In: Other
A 500 mL water sample was analyzed for solids concentrations. The sample was filtered through an ash-free 1.5 µm filter paper having a tare weight of 1.115 g. After drying at 105 °C for 24 h, the filter paper weighed 1.552 g. The filter paper was then placed in a crucible having a tare weight of 32.216 g and which was then placed in an ashing oven at 550 °C for 24 h. After cooling, the crucible weighed 32.521 g. A subsample consisting of 50 mL of the filtrate was placed in a crucible having a tare weight of 41.814 g. After drying (105 C for 24 hr), the crucible weighed 41.828 g, and after ashing (550 C for 24 hr) it weighed 41.820 g.
Required: Determine the following concentrations in mg/L: a. Total suspended solids (TSS) b. Fixed suspended solids (FSS) c. Volatile suspended solids (VSS) d. Total dissolved solids (TDS) e. Fixed dissolved solids (FDS) f. Volatile dissolved solids (VDS) g. Total solids (TS) h. Total volatile solids (TVS) i. Total fixed solids (TFS)
In: Other
Which type of intermolecular forces (hydrogen bonding, dipole-dipole forces, London dispersion forces) would occur for each compound?
Sucrose
Benzoic Acid
Naphthalene
2 - Naphthol
Phenol
A short descrition to why each compound has each type of bondig would be awesome! Thank you!
In: Other
characterise solid particles based on their sphericity
a) i )calculate the sphericity of a cuboid particle of dimensions 1mmx1 mmx2mmi
ii) compare the value caculated in part i to the sphericity of a sphere
answer part i) and ii) please 6 marks
In: Other
A food engineer stated that the milk sample he analyzed in the
laboratory was “FRESH MILK” in terms of acidity; reported that the
concentration of non-sodium hydroxide base used in the experiment
was 4 times higher than normal, and the sample analysis amount was
used at the standard value.According to this information, how many
microliters of base did most people use in the analysis?
In: Other
a) What is the monsoon? b) and what causes it?
In: Other