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Calculate the smallest increment of energy that can be emitted orabsorbed at a wavelength of 10.8 mm? What is the wavelength ofradiation that has a frequency of 7.8x10^10 s-1?
How whould you prepare a liter of carbonate buffer at a PH of 10.10, you are provided with carbonic acid, sodium hydrogen carbonate and sodium carbonate?
A saturated solution of strontium hydroxide is prepared andthe excess solid strontium hydroxide is allowed to settle. A25.0-mL aliquot of the saturated solution is withdrawn andtransferred to an Erl
25 g of HI is injected into a 4 L vessel that contains 20 g ofI2. When the system comes to equilibrium at 400 degreesC, what will be the total pressure inside the reaction vessel?Kc=0.0156 at 400 de
Helium-oxygen mixtures are used by divers to avoid the bendsand are used in medicine to treat some respiratory ailments. What percent (by moles) of He is present in a helium-oxygen mixture having a
Carbon dating may be used todate (once living) materials that are between 100 and 40,000 yearsold. The half-life of the first-order decay of carbon-14 is 5730years. What percentage of carbon-14 rem
Carotenoids, present in all organisms capable of photosynthesis, extend the range of light absorbed by the organism. They exhibit maximal capacity for absorption of light in the range of 440-470 nm.
How many ways there are to place three electrons into an f shell?what is the ground state term for thef3 configuration, and how many states areassociated with this term?
A scuba diver created a spherical bubble with a radium of 2.0cm at a depth of 30.0m where the total pressure (includingatmospheric pressure ) is 4.00 atm. What is the radius of the bubble when it re
A 0.5 cubic meter tank contains oxygen at 150 atm and 25oC. If oxygen may be assumed to behave as an ideal gas, how many kilograms of oxygen are there in the system?
A fuel gas containing methane and ethane is burned with air infurnace, producing a stack gas at 300C and 105kPa(absolute). Thestack gas contains C02 at a partial pressure of 80 mm Hg and no CO,O2, m
If we had not drawn te temperature graph to help determineout "real" highest temperature, would out specific heat have been higher or lower? Explain in few words.
In a test tube containing a precipitate of Pb(OH)2 in water, will the ions from the salt have a reasonable concentration? Explain. What are the concentrations of the lead(II) and hydroxide ions in e
A student is examining a bacterium under the microscope. The E.coli bacterial cell has a mass of = 1.60 fg (where a femtogram, fg,is 10^-15 g) and is swimming at a velocity of v= 4.00 um/s, with anu
A 15.5 mL sample of 0.215 M KOH soultion required 21.2 mL of aqueous acdic soultion in a titration experiment. Calculate the molarity of the acetic acid solution.
For each of the following three questions 25.0 mL of 0.100 Mpyridine (Kb = 1.70 x 10-9) istitrated with 0.100 M HCl. For each question calculate the pH ofthe final solution after the indicated amoun
A 15.60-mL sample of potassium hydroxide solution is titrated tothe stoichiometric point with 18.00 mL of a 0.292 M solution of HNO3. What is the molarity of the sample of potassium hydroxide?
Write chemical equations which show what happens when carbondioxide is absorbed by sodium hydroxide and when barium chloride isadded to the solution. Use these equations to justify our method for es
Find the uncertainty in position (in nm) associated with anelectron that is moving with a velocity of 274 km/s. Theuncertainty in the velocity is 5.00%. The electron rest mass is9.11 x 10-31
Why do we use 1.1 equivalentsof bromine solution in the reaction of trans-stilbene with brominein dichloromethane ? What principle are we taking advantage of? Briefly explain.
One reaction that occurs in producing steel from iron ore is thereduction of iron (II) oxide by carbon monoxide t give iron metaland carbon dioxide. The equilibrium contants Kp forthe reaction at 10
Natural gas is a mixture of hydrocarbons, primarily methane (CH4) and ethane (C2H6). A typical mitxture might have Xmethane=0.915 and Xethane=0.085. What are the partial presssures of the two gases
Consider a warm (30 degree Celsius) 355 mL can of soda, under 2.5atm CO2 pressure. What volume of CO2 will bereleased from the soda in order to reach equilibrium after opening where the pressure of
A solution is made by the addition of 0.34 mole of NaCN and 0.65mole of HCN and sufficient water to give a total volume of 1.2 L.How many grams of NaOH would need to be added to increase the pH by0
Calculate the concentrations of the protonated and unprotonated forms of bromothymol blue in 100 mL of a pH 8.1 buffer solution to which 1.0 mL of a 0.005 M solution of bromothymol blue in 80%water