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what is the energy of the light emitted in joules when an electron falls from the n=4 to the n=2 orbit in the hydrogen atom ? (E2= -328 kJ/mol , E1= -82 kJ/mol)
Find the value of Ka, for the conjugate acid of the following bases: a) methylamine, a solvent analogous to ammonia with a strong fish odor; Kb=5.0x10-4 b) morphine, an extremely powerful opiate;Kb=
Calculate the pH of a buffer solution made by mixing 46.8 g of sodium acetate into 1 L of a 0.1 M solution of acetic acid. Give the pH to two decimal places.
Calculate the pH of a buffer solution made by mixing 49 ml of a 0.07 M ammonia solution with 52 ml of a 0.10 M ammonium nitrate solution. Give the pH to two decimal places.
Selenious Acid, H2Se)3, is primarily used to chemically darken copper, brass, and bronze. It is a diprotic acid with the following Ka values: Ka1 =2.7x10-3 and Ka2= 5.0x10-8.what is the pH of a 2.89
Given the following data regarding nickel. What is the theoretical density of the metal
Al is added to Si to give an extrinsic semiconductor with a conductivity of 2 ( cm)^-1 How many Al atoms are added per cm^3? How many Si atoms are there for each AI atom
The minimum amount of energy required to bring about a chemical reaction is called
Write a balanced net ionic equation for the reaction of each of the following aqueous solutions with H+ ions.A) Sodium fluoride
Calculate [OH-] and pH in a solution in which dihyroden phosphate ion, H2PO4-, is 0.355M and hydrogen phosphate ion, HPO4 2- is
Calculate the pH change that results when 11 mL of 5.8 M NaOH is added to 800. mL of each the following solutions.
The methane is heated by a stream of saturated steam entering the heat exchanger at 1.9 bar and leaving as a liquid at 60.0°C. Find the volumetric flow rate of saturated steam into the heat exch
A sample of oxygen at 65°C under a pressure of 800 torr occupies 425 mL. What volume would it occupy at standard conditions
Predict the geometry of the following species using the VSEPR model. electron domain and molecular geometry.
The molecular weight of X is 65.0 g/mol. The heat required to melt one mole of the solid phase is 20.0 kJ, the heat required to sublime one mole of the solid phase is 40.0 kJ, and the heat required
A metal sample weighing 124.10 g and at a temperature of 99.3 C was placed in 42.87 g of water in a calorimeter at 23.9 C. At equilibrium the temperature of the water and metal was 41.6 C.
Calculate the degrees of unsaturation in a compound with the molecular formula C3H6 and draw two possible structures, including hydrogen atoms, for the formula.
Given the following heats of formation, delta H f, in kJ per mole, as obtained from a table of deltaHf data, calculate the delta H for the reaction in part f. Compare your answer with the result you
Determine the angle for the first-order diffraction of xrays with lambda=362 pm, reflected from planes in mica (a silicate mineral) separated by 997 pm
Why does the water solubility of the acidic compound change when going from the aqueous base to the aqueous acid? pls write the eq'n to illustrate this change.
Which of the following functional groups will exhibit NO IR absorption at 1630 -1780 cm-1 or at 3200-3550 cm-1
Org chemistry lab Q lab 2: why does the water solubility of the acidic compound change when going from the aqueous base to the aqueous acid.?? pls write the eq'n to illustrate this change
A boiler is used to heat steam at a brewery to be used in various applications such as heating water to brew the beer and sanitizing the brewing tanks. 81.0% of the heat produced by the boiler is us
The reaction of 0.25 g magnesium with 100 mL of 1 M hydrochloric acid (density d = 1.02 g/ml) raises the temperature of the solution from 20 °C to 35 °C . The specific heat for HCl is 3.93 J