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An 18.0-g sample of magnesium is completely burned in the presence of air to form magnesium oxide. What is the mass of the magnesium oxide obtained?
a mixture of Phe (pI 5.5), Thr (pI 6.5), Asp (pI 3.0), His (pI 7.6), and Lys (pI 9.8) at pH 9.8 is loaded on an anion-exchange column and then eluted with a pH gradient of lowering pH. what order will the aminoo acids elute? Explain.
if you prepare a 1.00 solution of beginning with water at 27.5 what is the final temperature of the solution in ?
One molecular form of elemental sulfur is a ring of eight sulfur is a ring of eight sulfur atoms. As one molecule of this element is burned to make sulfur trioxide, how many oxygen molecules are used?
describe the error that has occured; that is, is the mass of the anhydrous salt remaining in the crucible reported as being too high or too low? explain.
Determine the pH of a solution of a .150 M NaF solution. (ka for HF=3..5*10^-4) 3)Determine the pH of .050 M H2CO solution and the % dissociation of each step
Explain the effect of the following experimental errors on your results: a) You add hexane to the reaction flask instead of 1-hexene b) You use 3% hydrogen peroxide instead of 30% c) You forget to add potassium carbonate in the seperation step.
Calcium Oxide reacts with water in a combustion reaction to producee calcium hydroxide: CaO(s) + H2O(l)----> Ca(OH)2(s)
Consider three different compounds of the hypothetical element X using the table of bond lenghts as a reference, rank the three compounds shown below in order of increasing
The Na -glucose symport system of intestinal epithelial cells couples the \"downhill\" transport of two Na ions into the cell to the \"uphill\" transport of glucose, pumping glucose into the cell against its concentration gradient
Standard reduction potentials are given on the next page. (a) Draw a diagram of the electrochemical cell, labeling all electrodes and solutions. (b) What is the pH in the Pt | H+ | H2 half-cell. (c) What is the value of the equilibrium constant fo..
what is the least amount of energy that can be emitted by an excited electron in a hydrogen atom falling from an excited state directly to the n=3 state? what is the quantum number n for the excited state
When 24 mL of a 190 mL stock solution containing 1.8 M BaF2 is diluted to 78 mL, what is the concentration of Ba2+ in the new solution?
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