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(a) What are the similarities and differences between the 1s and 2s orbitals of the hydrogen atom?
(b) In what sense does a 2p orbital have directional character? Compare the "directional" characteristics of the and orbitals. (That is, in what direction or region of space is the electron density concentrated?)
(c)What can you say about the average distance from the nucleus of an electron in a 2s orbital as compared with a 3s orbital?
(d) For the hydrogen atom, list the following orbitals in order of increasing energy (that is, most stable ones first): 4f, 6s ,3d,1s, 2p.
What is the sum of the H-X-H bond angles (in degrees) in the following hydrides. BeH2, BH3, CH4 Calculate the bond angle for each molecule and add the three values to get your final answer.
The density of helium gas is 0.1785 g/L. Calculate its molar volume. Molecular weight of He= 4.00 g/mol. Hint L/mol. (please show steps)
What mass of sucrose (C12H22O11) should be combined with 500 grams of water to make a solution with an osmotic pressure of 8.70 atm at 295 K
55.0 mL of a 1.70 M solution is diluted to a volume of 278 mL. A 139 mL portion of that solution is diluted using 175 mL of water. What is the final concentration
You are the project manager of an environmental company that was hired to cleanup a historical arsenic contamination site. Soil sampling results indicated the area impacted with arsenic above action levels is 30 feet by 55 feet. The depth of th..
A baked cake is taken out of a 400 degrees oven as well as placed on a table in a 65 degree room. Twenty minutes later the temperature is 320 degrees. It cools according to newtons law. What the temperature of the cake after 30 minutes. All temper..
Calculate the hydronium concentration for a solution prepared by dissolving 0.15 mol of benzoic acid (C6H5COOH) and 0.30 mol of sodium benzoate (C6H5COONa) in 1.00 L of solution. (Ka of C6H5COOH = 6.5 x 10-5)
explain why the vitamin tablet is crushed before titrating with the iodate titrant.
A certain carbon-hydrogen compound contains 84.1% C by mass and the remainder is hydrogen. What is the empirical formula of the compound
Calculate the [H3O+] of a solution that has an [OH] of 0.000 0060M. Is the solution acidic, basic or neutral. Calculate the pH and pOH of a solution that has an H2O+ concentration of 1.3 x 10 -6M.
How many hours will it take to produce 47.0 kg of Al metal by the reduction of Al3+ in an electrolytic cell using a current of 487 amps
What are the concentrations of acetic acid (pKa = 4.76) and acetate in a buffer solution of 0.10 M at pH 4.5? Enter your answer to two significant figures.
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