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A. Why can't a pen be used to draw the baseline on the chromatography paper?
B. Why is it important to stop the chromatograph before the solvent reaches the top of the paper?
C. Why is it important to keep the dye spots above the solvent level?
D. Why is it important to mark the solvent level on the chromatography paper when you remove it from the petri dish?
Extra credit and/or extra fun possibilities: Experiment with different solvents such as pure water, rubbing alcohol, or a mixture of alcohol and water. Do not use flammable solvents to experiment! There are often interesting dyes making up the colors of marker pens (especially black). If you want to experiment with marking pens remember not to use permanent ink markers for this experiment.
a 125 g metal block at a temperature of 93.2 degrees celsius was immersed in 100 g of water at 18.3 degrees celsius.
At 0.0oC, if the volume of air is 2.9 mL and the pressure of the atmosphere that day is 675 mmHg, what is the number of moles of air?
For every one of the carbonyl-containing products listed below, pick a appropriate starting material and reagent(s) for oxidative cleavage
elemental exonium not a real element consists of two major isotopesabundance mass59 94 amu41 112 amuwhat is the atomic
If the density of gasoline is 0.66 g/mL , how many kilocalories of energy are obtained from 2.2 gal of gasoline?Express your answer using two significant figures.
when pcl5 solidifies it forms pcl4 cations and pcl6- anions. according to valence bond theory what hybrid orbitals are
A 460 mL sample of oxygen (O2) was collected by displacement of water at 24 ? C under a total barometric pressure of 1095 torr. What mass of dry oxygen was collected? The vapor pressure of water at 24 ? C is 22 torr
Galvanized nails are iron nails that have been plated with zinc to prevent rusting. The relevant reaction is Zn2+(aq)+2e- -> Zn(s) For a large batch of nails, a manufacturer needs to plate a total zinc mass of 1.60 kg on the surface to get adequat..
Pure 2-methylpentane is held in a closed container at 150 degrees F. Both gas and liquid are present. What is the pressure in the container?
Supply structures for the various aldol condensation products you expect from the self-condensation of 2-butanone. Utilize computer-aided software to actually sketch the products please don't just give formulas.
With acid-catalyzed condensation of a molecule with two aldehyde groups that is suitable for forming 5- or 6-membered rings, are both carbonyls protonated right away at the same time
What mass of Al2O3 in grams can be made by reaacting 4.6 g AL with excess oxygen?
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