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a) Use Planck's equation (E = hv) to determine the energy, in kilojoules per mole, of radiation of frequency 2.12×10^14 (s^-1).
b) What electron transition in a hydrogen atom, starting from the orbit 10, will produce light of wavelength 380 nm?
Discuss some of the advantages and disadvantages of the WHO protocol versus the single test. Give the assumptions that you have made in carrying out calculations.
How many tons of ice cream will the factory produce? how much does it pay in emission fees? what are its profits?
One has a dipole of 0 D, and the other has a dipole moment of 2.95 D. Draw the structure of the stereoisomer with dipole moment of 2.95 D.
Is it possible to have homogeneous binary liquid solution whose viscosity is higher or lower than that of either of the two component liquid? what conclusions would you draw about the nature of intermolecular interactions in such a mixture
a 3.8 kg block is accelerated from rest by a compressed spring of spring constant 650 N/m. What is the original compression distance of the spring
Write an e-mail that will impress your supervisor. Make sure the subject line is concise and descriptive or what the memo is about.
Q#1Assume the demand curve for beer is given by P=11.7-2Q; the supply curve is given by P=Q.
In a church choir loft, two parallel walls are 5.70 m apart. The singers stand against the north wall. What width of the north wall can she see
In the purification process, the organic layer is washed with 2 M NaOH and then with water. What is the purpose of these washes
How many cells are on the plate. What fraction of the cell surface is occupied by receptors versus normal phospholipids
A power company burns approximately 474 tons of coal per day to produce electricity. If the sulfur content of the coal is 1.30% by weight.
Propose a reasonable reaction for the sodium hypochlorite oxidation of 3-hetpanol. Give the IUPAC name of expected product. What other oxidizing agents may be used to carry out oxidation
The partial pressure of O2 in the exhaust is 75.19 mmHg and the partial pressure of CO2 in the exhaust is 47.94 mmHg. What is the mole fraction of propane in the fuel stream? (mol C3H8 / mol)
10 mg of magnesium metal and 30 ml of hydrochloric acid are added to 300 ml of water and hydrogen gas is eveloved. The reaction is as follows: Mg + 2HCl -> H2 + Mg2+ (aq) + 2Cl- (aq). Calculate the limiting reactant.
a chemical reaction produces 0.884mol of H2S gas. what volume will that gas occupy at STP?
For a radioactive decay (decomposition of a radioactive substance) the half-life is 6.0 h. How much radioactive substance remains after 22 h, in % (radioactive decay is a first-order process)
When she introduced 0.177 moles of NOBr(g) into a 1.00 Liter container, she found the equilibrium concentration of Br2(g) to be 1.76E-2 M. Calculate the equilibrium constant, Kc, she obtained for this reaction. Kc =
suppose that after delivery several drops of the water cling to the inner wall of the pipet because the pipet wall is
One mole of sucrose weighs 342.3 grams. 1mol=6.02*10^23 molecules. Dietary fats (typically 18-20 carbons) contain about 9 dietary calories per gram. Assume all food consumed goes to making ATP
Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M NH4Cl with 100.0 mL of 0.20 M NH3. The Kb for NH3 is 1.8 x 10-5.
What is the molarity of sodium acetate. What is the pH of the solution. Please show the steps. (note pK = 4.76) Use log10 for all calculations.
bromine can be obtained from the decomposition of calcium bromide by means of electrolysis. if 10.0 g of calcium
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