Chemistry question and answers for August 02, 2023
- Q Vitamin B12 was used in a column chromatographyexperiment as a marker to show when all of the protein had elutedoff the column. Will vitamin B12 show up on the SDS-PAGE?Explain.
- Q Electrochemistry - Standart Potential1. For the voltaic cell shown, calculate theEocell.St. Red. Pot. (V)Hg2Cl2/Hg0.34Cu2+/Cu+0.16Hg(l), Hg2Cl2(s) l Cl-(aq) llCu2+(aq), Cu+(aq) l Pt(s)2. Calculate the standard emf for a voltaic cell whose...
- Q 12.     Predict the direction of the equilibrium shift when temperature isdecreased in the following reactions:a.        C2H2 (g) + H2O (g) ?CH3CHO (g)      [?H = -151kJ/mol]b.        CH3CH2OH (l) + O2 (g) ?CH3CH2O (g) + H2O(g)      [?H...
- Q To resolve an object in an electron microscope, the wavelengthof the electrons must be close in the diameter of the object. Whatkinetic energy must the electrons have in order to...
- Q A 29.6 mL sample of 0.260 Mdiethylamine,(C2H5)2NH, istitrated with 0.338 M hydrochloricacid.After adding 33.7 mL of hydrochloricacid, the pH is.Use the Tables link in the References for anyequilibrium constants that...
- Q Many linear polymers can exhibit large amounts of deformation.Explain how the structure of this type of polymer changes as itundergoes loading to failure.The type of polymer is linear. How do...
- Q EAS//Nitration of bromobenzeneBrief summary of procedure.- Mix sulfuric acid +nitric acid, then cool in water bath. Addstir bar, condenser and reflux for 10 minutes while slowly addingbromobenzene. Don't exceed 55...
- Q Magnesium sulfate has a number of uses, some of which arerelated to the ability of the anhydrate form to remove water fromair and others based on the high solubility of...
- Q A). A buffer solution is made that is 0.337 Min H2CO3 and0.337 M inKHCO3.(1) If Ka forH2CO3 is4.20×10-7, what is the pH of the buffersolution?  (2) Write the net ionic equation...
- Q An enzyme is discovered that catalyzes the chemical reactionSAD --> <-- HAPPYA team of motivated researchers setout to study the enzyme, which they call happyase. Under a constantenzyme concentration, [E]...
- Q Why is it important to avoid air bubbles when you pack columnsfor column chromatography? If you accidently introduce air bubblesinto the columns, what are the strategies you could take to...
- Q Use the data in Appendix B in the textbook to calculate thefollowing quantities. (College Chemistry II)Part A-N2(g)+2H2(g)?N2H4(l) (Expressyour answer using one decimal place.)1. ?H? for the following reaction?2. ?S? for...
- Q At 800 K, the equilibrium constant, Kp, for the followingreaction is 3.2 ´ 10-7. 2 H2S(g) f 2 H2(g) + S2(g) A reactionvessel at 800 K initially contains 3.50 atm...
- Q This is the substrate concentration and the kinetic slopes fromlab experiment. I'm suppose to construct a graph to estimate Km andVmax (that's where I need help. How do I do...
- Q use the following information to determine if theintermolecular forces of isopropyl alcohol are greater or weakerthan the intermolecular forces of water? the melting point of isoalcohol is about -90c and...
- Q Therising cost and decreasing supply of oil will require alternativefuels for transportation one option currently under research is theuse of hydrogen for fuel. Hydrogen can be extractedFrom natural gas according...
- Q The reaction F + G = H is at equilibrium, under standardconditions.(a) Calculate ∆Go’ if [F] = 2mM, [G] = 3 mM, and [H] = 9 mM(b) What happens to...
- Q Determine the pH of a solution that is 0.025 M C2H8N2 whereKb(C2H8N2) = 8.3 * 10−5?
- Q solution, mL dissolved rock1.             102.              103.             104.             105.              10                mL 0.100M sodium metasilicate added01.002.004.0020.00total volume5050505050Si Signal (mA)0.2350.5000.7681.2505.202A 10.000g sample of rock containing quartz as the sole source ofsilicon is dissolved and diluted to 1.000 +/- 0.010...
- Q Use the data found in the appendix to determine the values forthe O-Cl and the O-F bond energies. (heats of formation ofOF2 and OCl2 are 24.7 and 80.37 kJ/mol,respectively)DO-FkJ/molDO-ClkJ/mol
- Q The boiling point of pure ethanol at 760. torr is 82.0 degreescelsius. What would bet the vapor pressure of ethanol over asolution containing 2.13 mole of nonvolatile hydrocarbon and 15.30moles...
- Q 11) In the reaction of nitrogen gas with hydrogen gas to formammonia gas, NH3, bow many grams of hydrogen are needed to reactwith two moles of nitrogen?
- Q ErmTR is an enzyme found in S.pyogenes strains that are resistant to erythromycin. While workingin the lab one afternoon you discover a small molecule (C23) thatinhibits the activity of ermTR....
- Q Please show work.A. For single reactant: observe the change in rate for a changein initial reactantconcentration.Reaction 1Reaction 2Reaction 3[A] (M)Initial Rate (M/s)[C] (M)Initial Rate (M/s)[K] (M)Initial Rate (M/s)0.100.0150.100.0150.100.0150.200.0300.200.0600.300.1350.400.0600.400.2400.901.215The table above...
- Q Consider the following chemical reaction: 2 CH4(g) 3 O2(g) 2CO(g) 4 H2O(l) Select all the statements that are correct:The reaction should become more product favored at hightemperaturesThe reaction should become...
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