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(a) Compare the electronic structures of atomic chromium and atomic selenium. In what respects are they similar, and in what respects do they differ?
(b) Chromium is a metal, and selenium is a nonmetal. What factors are important in determining this difference in properties?
oxygen is burned completely, 3.86 grams of CO2 and 1.26 grams of H2O are produced. What is the empirical formula of the compound?
Use the values of Ka1 = 0.056 and Ka2 = 5.4 x 10-5 to calculate the [OH-] in a 0.898 M solution of oxalic acid (H2C2O4). Use E notation and 3 significant figures.
A chemist dissolves 284 mg of pure potassium hydroxide in enough water to make up 140 mL of solution. Calculate the pH of the solution.
Find out the Kb of ammonia if the pH of a buffer formed by mixing 50.0 mL of 1.00 M NH 3 and 50.0 mL of 1.00 M ammonium nitrate?
What is a possible molecular formula of the hydrocarbon?
Which is more dense, Argon or Xenon? Assumente temperature and pressure are constant. Explain.
1-A 27.9 g sample of ethylene glycol, a car radiator coolant, loses 680. J of heat. What was the initial temperature of ethylene glycol if the final temperature is 32.5°C (c of ethylene glycol = 2.42 J/gK)
One bit of evidence that the present theory of atomic structure is "correct" lies in the magnetic properties of matter. Atoms with unpaired electrons are attracted by magnetic fields and thus are said to exhibit paramagnetism.
Predict whether zinc and silver react with 1 M sulphuric acid to give out hydrogen or not. Given that the standard potentials of zinc
What is the final pH if .2 mol HCL is added to .5L of a buffer solution formulated using .28 M NH3 and .22 M NH4CL?
Two manufacturing plants need 1.0e4 kg of Al each week. One plant produces the Al from bauxite (Al2O3), whereas the other gets its Al from recycled cans.
Is smaller sample capacity the only disadvantage to smaller particle size of the stationary phase? Is that correct and/or is there any other disadvantage(s)?
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