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1. What happens if the spots are made too large when preparing a TLC plate for development?
2. What happens if the spots are made too small when preparing a TLC plate for development?
3. Why must the spots be above the level of the development solvent in the developing chamber?
4. What would happen if the spotting line and positions were marked on the plate with a ball-point pen?
5. Is it possible to distinguish two spots that have the same Rf value but represent different compounds? Give two different methods.
6. Name some advantages of using acetaminophen (Tylenol) instead of aspirin as an analgesic.
The Haber process is utilized to synthesize ammonia from hydrogen and nitrogen. How much hydrogen is required to produce 42.8 kg of ammonia. A 2.0 L vessel is filled with 7.3´ 10-4 mol hydrogen and 6.8´ 10-4 mol oxygen. Explain how much water can be..
a solution containing 29.85 mg of an unknown protein per 25.5 ml solution was found to have an osmotic pressure of 3.85
Based on this data, what can you predict about the average atomic mass of vitellium?
Which of the following functions meet all the requirements of a probability- density, assuming that a and b are positive constants. a) exp(iax), b) x exp(-bx2) c) exp(-bx2)
Draw a molecule that will produce a spectrum containing two triplets appearing at different chemical shifts and both having an integral of 2 hydrogens.c
What can we say about the temperature change of a sample of water when the value of q is negative
what volume in milliliters of a 0.141 solution is required to reach the endpoint in the complete titration of a 16.0
A 6.55 g sample of C6H5NH2 was combusted in a bomb caloriemeter. If the temp rose by 32.9 degreese C use the info below to determine the heat capacity of the calorimeter (Ccal)
Nitrogen reacts with hydrogen according to the following equation.
Problem- Assuming volumes are additive, how much water (in mL) should be added to 30.8 mL of a 1.12 M solution of hydrochloric acid (HCl) to produce a 0.100 M solution
An industrial wastewater contains 2000 mg/L of total Ammonia as N, 490 mg/L of total Ni and has no inorganic carbon. The PH = 2.8. Using the diagram calculate to what pH the waste must be adjusted to so that the total Ni concentration is 1 mg/L.
Identify the group of elements that corresponds to each of the following generalized electron configurations and indicate the number of unpaired electrons for each:
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