Electron configuration and orbital energies
Despite the expected decrease in atomic size, there is an unexpected drop in the first ionization energy between Groups 2A and 3A in periods 2 through 4 (e.g., Be to B). Explain this pattern in terms of electron configuration and orbital energies.
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A test tube containing a mixture of KCl, KClO3, and MnO2 having a total weight of 23.584 g was heated to compose the KClO3. After heating, the mass was found to be 22.347 g. a) How many moles of oxygen gas were evolved?
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A buffer solution is prepared by adding 15.0 g NaC2H3O2 and 12.5 g acetic acid (C2H4O2) to enough water to make 500.0 ml of solution. What is the pH of the buffer solution? [pKa of acetic acid is 4.77]
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A bicycle tire is filled with air to a pressure of 100. psi at a temperature of 19 degrees celcius. Riding the bike on asphalt on a hot day increases the temperature of the tire to 58 degrees celcius. The volume of the tire increases by 4.0%. What
When 10cm3 of a gaseous hydrocarbon CaHb was exploded with an excess of oxygen, a contraction of 35cm3 occured (all volumes are measured at rtp). On treatment of the product with NaOH solution, a contraction of 40cm3 occured. Deduce the formula of
A 40.0 mL sample of oxygen is collected by water displacement at 24.0 degrees celcius. What volume would the dry gas occupy at standard pressure if the original pressure is 98.5 kPa?
The rate constant for the reaction at 30oC is 0.120 L*mol-1*s-1. How long does it take an initial concentration of 0.150 mol/L to reduce to one-quarter the initial concentration?
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Explain the risks of not reporting the results of your forensic assessment findings accurately. Provide specific examples.
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