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A student used a cation exchange resin to determine themolarity of sodium ion in an unknown sodium chloride solution. The student diluted the 25.00mL aliquot of the original unknownsolution to 250.0
A 0.26 kg particle moves along an x axis according to x(t) = - 14 + 3 t + 5 t2 - 5 t3, with x in meters and t in seconds. What are projections of the net force acting on the particle at t = 3.5 s on
If .934 grams of AgNO3 (formula weight 169.91 g/mol)were reacted with 100mL of 0.100 M HCL to make AgCl(formula weight 143.35 g/mol) which reactant would be the limiting reagent and t
A rectangle has a length of 2d, and a height of d. Each of the following three charges is located at a corner of the rectangle; +q1 at the upper left, +q2 at the lower right, and -Q at the lower lef
Vector is 3.0 units in length and points along the positive x-axis; vector is 4.0 units in length and points along a direction 150o from the positive x-axis. What is the magnitude of the resultant w
Jack pulls a sled across a level field by exerting a force of 110 N at an angle of 30o with the ground. What are the parallel and perpendicular components, respectively, of this force with respect t
Determine the difference in the pulses' times of arrival at the detector. (Assume the index of refraction of ice is 1.309.) Answer in units of ns.
Determine the enthalpy change, for dissolving thesalt. Report the value as the total energy absorbed orreleased when the entire sample of salt dissolves and then on apergram basis. What additional i
A tablet of a dietary supplement containing calcium carbonate is tonuetralize 38.3 mL of 0.251 M of HCL, forming calcium chloride,water and CO2. Calculate the number of milligrams of CaCO3 in t
A precipitate of FeS (Ksp = 6.3 x 10^-18) is formed by mixing 125.00 mL of a 0.32 M solution of Fe(NO3)2 with 100.00 mL of a 0.40M solution of Na2S.
An amount of 1.250g of an alloy (90% Ag, 10% Cu) was treated withHNO3 and H2SO4 to form Ag2SO4 and CuSO4. The solution was then treated with Cu wire to precipitate silver.
Write molecular and net ionic equations for the successive neutralizations of each acidic hydrogen of phosphoric acid by calcium hydroxide solution. Ca3(PO4)2 is insoluble; assume that the acid salt
You react 100.0 ml of a 1.01 M HBr(aq) solution with 99.1 mlof a 1.05 M KOH(aq) solution. The density of each solution is 1.04g/ml. The heat capacity of the calorimeter is 7.0 J/C.
If you react 100 ml of a 0.115 M Solution of HBr (aq) with98.0 ml of a 0.120 M solution of KOH(aq), how many moles are actually neutralized? After mixing, will the resulting solution have excess aci
Enormous numbers of microwave photons areneeded to warm macroscopic samples of matter. A portion of soup containing 235 g water is heated in a microwave oven from 21°Cto 90.°C, with radiatio
Use notation showing the symbol, the mass number as asuperscript and the atomic number asa subscript. Write the mass of the isotopes and their abundance.
Calculate the wavelength of radiation transmitted f from a FM radio station which operates at a frequency of 91.3MHz(Megahertz).(c=2.9979 x 10^8 m/s)
What is the purpose of applying the three amino acid sequence RGD to the surface of biomaterials? Through what cell surface receptor does the RGD interact with?
Why does H3O+ concentration have more influence on the precipitation of the salt of a weak acid, such as CaC2O4, than on the precipitation of the salt of a strong acid, such as AgCl or CaSO4?
A 0.45 M solution of pentanoic acid (CH3CH2CH2CH2COOH) is found tohave a pH of 3.73 at 298K. What is the value of the acid dissociation constant Ka for this monoprotic acid?
For a one step reaction, the activation energy for the forward reactio is +40.0 kJ / mol and the enthalpy of reaction (ΔH) is +20 kJ/mol. What is the activation energy for the reverse reaction
In the Haber process, at 450°C, has an equilibrium constantK = 0.30. What is the equilibrium concentration of hydrogen in a system containing the following equilibrium concentrations of nit
The specific heat capacity of liquid water is 4.18 J/g-K. How many joules of heat are needed to raise the temperature of 5.00 g of water from 25.1°C to 65.3°C?
What reagent solution would you use to separate the cations in the following pairs, that is, with one cation appearing in solution and other in precipitate?
A standardized KMnO4 solution can be used to analyse compounds of unknown composition. One such compound is hydrated calcium oxalate, CaC2O4 xH2O.