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Discuss in terms the valance bond theory and the electron configuration why it is possible to have a PH5 molecule but not a NH5?
Explain how the bonds form between Sulfur (S) and each Fluorine (F) atom in SF6 by using the valence bond theory to how to combine all the promoted electrons into a hybrid.
Determine the number of molecules in anagrams gel electrophoresis band which has.05 micrograms of a1000 bp fragment of the DNA. There are 660g/mol/bp where the Avogadro's number is 6.02 x 10^23.
Explain how would you calculate the exact number of cells in one mL of culture? There are approximately 10^9 cells/ mL in a culture of E. coli cells grown overnight.
Discuss why is it important to isolate single colonies and to use only the isolated colonies in this experiment and in biotechnology in general when the cells that are used in the plasmid prep lab
Water in contact with air is acidic, rather than neutral, due to dissolve the carbon dioxide. Water in equilibrium with air contains 4.4 x 10-5% CO2.
Determine the entropy change of the substance associated with the freezing process (in J/mole/K, with three significant figures). A certain amount of heat, 5.21 kJ, is released during the
What are the hydronium ion concentration and the pH of the solution when a student prepared a 0.10 M solution of acetic acid, CH3COOH and the acetic acid has a Ka of 1.75 x10-5.
What was the concentration of the hydrochloric acid when a titration was performed on the 50.0 mL of 0.250 M NaOH. After the addition of 71.4 mL of HCl, the phenolphthalein indicator changed from t
Write down a balanced equation for the reaction of the calcium hydroxide, Ca(OH)2, with phosphoric acid, H3PO4, producing the water, H2O and the calcium phosphate, Ca3(PO4)2.
Determine the number of moles in the 17.7 grams of the compound. Determine the empirical formula for this compound?
What is the formula of metal chloride if a metal chloride containing 65.74% of Chlorine? Specific heat of metal is 0.115 where 400cc of the vapor of metal chloride at NTP has the weight of 5.8gm.
Demonstrate a correct numerical setup for calculating the number of moles of Mg(OH)2(gram -formula mass = 58.3 grams/mole) in an 8.40 gram sample.
Calculate the formulas for the insoluble precipitates produced when the sodium hydroxide reacts with Copper (II) ion, Iron (III) ion, and Lead (II) ion?
Suppose you prepare a buffer solution by dissolving the 2.00 g each of benzoic acid, HC7H5O2 , and the sodium benzoate, NaC7H5O2, in 750.0 ml of water.
Determine the numbers of grams of (NH4)2SO4 must be dissolved in the 0.500 L of 0.35 MNH3 to form the solution with pH = 9? Suppose that the solution volume remains at 0.5 L
Two stereo isomers are obtained from the reaction of HBr with (S)-4-bromo-1-pentane. One of the stereo isomers is optically active and the other is not.
How will the titration differ from the one you performed in the laboratory if HCl is placed in the buret and NaOH is mixed with the phenolphthalein in the Erlenmeyer flask?
Explain what does the Roman numeral stand for in an ion such as Lead (II)? Discuss why does an element such as lead need a Roman numeral behind it?
Explain what kind of a person was Mother Teresa? What were some of her great accomplishments and what did her accomplishments do for the people in the world.
Calculate the difference between the nuclear fission and nuclear fusion processes. Use nuclear equations to illustrate the difference.
Explain why it would be reasonable to have silicon based life-forms as opposed to the carbon based life produces on the Earth and also think about the chemical properties of each.
Does this product have the R or the S configuration? (Illustrate the product using a Fischer projection showing the proper configuration) When (S)-(+)-1-chloro-2-methylbutane reacts wit
Explain why a pressure cooker has a tight lid that presses down on the steam from boiling water, allowing food to cook faster than it does at atmospheric pressure?
Determine the numbers of grams of potassium are in the 3.10 kg of apples? Nutritional tables give the potassium content of a standard apple (about 3 apples /lb) as 159 mg.