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If copper has a photoelectric threshold wavelength of 279 nm, calculate the velocity (m/s) of the electron emitted when copper is illuminated with light with a frequency of 2.33 × 1015 Hz. Express answer in scientific notation.
Mg + 2HCl --> MgCl2 + H2 For a mass of 0.013 g Mg and 5.0 mL of 1.00 M HCl, in a flask with V = 140.612 mL at 23.5?C. Calculate the initial and final pressure (atm).
The carburizing gas holds the surface composition at 1% carbon for all t > 0. If D=1.4 x 10^-7 cm^2/sec: (a) Calculate the time required at the carburizing temperature
Assign oxidation numbers to all the elementals in each of the following: a)PO3^2- b)NH4^+ c)Fe(OH)2 d)HNO3 e)Cr2O7^2-
if each hydrogen molecule forms 2e- then how many kg of h will be required to produce the electricity required for a
A 0.0560 g quantity of acetic acid is dissolved in enough water to make 50.0 mL of solution. Calculate the concentration of H+, CH3COO-, and CH3COOH at equilibrium. Ka for acetic acid= 1.8x10^-5.
Carryout the following conversions. Report your answer to the correct number of significant figures
The density of the manometer fluid is 2.75 g/cm3. The height of the manometer fluid on side 1 is 324 mm. The height of the manometer fluid on side 2 is 326 mm
What is the concentration of an NaOH solution that requires 50.0 ml of a 1.25 M H2SO4 solution to neutralize 78.0 ml of NaOH?
Is the reaction spontaneous?
Using a solution prepared by adding 467 mL of 0.400 M silver nitrate with 421 mL of 0.503 M sodium phosphate then determines what is the silver ion concentration in? Ksp of silver phosphate = 2.8 × 10-18
How is it possible that hard water can also be very saline ie The River Murray in South Australia? If sodium is added to soften hard water, then wouldn't the presence of salt in hard water 'soften' the water naturally
Calculate the equilibrium constant, Ke, for the reaction assuming the concentrations for reactants and products are the following
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