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When an electron moves from level n = 4 to level n = 5 in an excited hydrogen atom, what amount of energy is required for this electronic transition?
Calculate the change in pH caused by adding 10.0 mL of 3.30-M HCl to 440. mL of each of the following solutions.
A stock solution is prepared by adding 24 mL of 0.4 M Na3PO4 to enough water to make 79 mL. What is the PO43- concentration of 25 mL of the stock solution?
If 12.5 g of sucrose is added to 225 g of coffee by how much will the boiling point change upon adding the sugar? Assume the Bp of coffee is the same as pour water.m.
Based on the value obtained in the three heating above, do you think the student should have confidence in his results? why? what do you think he should do to be more confident in his result
If desalinated water costs 2250 per acre-foot, how much does desalinated water cost per liter?
milk is pasteurised when heated to 63 C for 30 minutes, but if it is heated to 74 C it takes only 15 seconds for the same result. Find the activation energy for this sterilisation process
the main product of the reaction is 1-iodo-1,1-diphenylethane. Propose a plausible mechanism that accounts for the formation of this product. Use arrows to indicate electron flow in each step.
which solution can conduct an electrical current?
What is the pH during the titration of 25.00mL of 0.10M NH3 (Kb = 1.8 x 10-5) after the addition of 10.00mL of 0.10M HCl titrant?
A solution is 0.0100 M in Pb2+ ions. If 0.103 mol of solid Na2SO4 is added to 1.00L of this solution (with negligible volume change), what percent of the Pb2+ ions remain in solution.
A 13.74 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 20.49 grams of CO2 and 6.291 grams of H2O are produced.
Which of the following is a use for nuclear energy?
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