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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.
The decomposition of dimethyl ether, (CH3)2O(g) -> CH4(g) + H2(g) + CO(g), is first-order with a half-life of 1733 s at 500oC. In an experiment at this temperature, if [(CH3)2O
When 3.56 g of an unknown hydrocarbon was dissolved in 125 g of benzene, the freezing point of the solution was found to be 4.41oC. Analysis of the hydrocarbon showed that it contained 93.71% carbon (
When is extraction an appropriate technique for separation (ex: is there an ideal sample size range, is there a minimum starting purity, what final purity should be expected, etc.)?
In the titration of an impure sample of KHP, it was found that 30.6 mL of 0.100 M NaOH was required to react completely with 0.745 g of sample. What is the percentage of the KHP in this sample?
Calculate the frequency of a photon emitted when an electronof a hydrogen atom drops from energy level n=5 to n=3.
If 1 kg of hydrogen is completely burnt in oxygen and the heat released is used to convert water to steam, how much mass of water can be converted to steam?
A 33 g ice cube at its melting point isdropped into an insulated container of liquid nitrogen. How much nitrogen evaporates if it is at its boiling point of 77 K and has alatent heat of vaporization
According to the VSEPR theory, what should be the shapearound each carbon atom, in a molecule of cubane? What bond anglesare associated with that shape?
Trichloroacetic acid (CCl3CO2H) is acorrosive acid that is used to precipitate proteins. The pH of a0.050 M solution of trichloroacetic acid is the same asthe pH of a 0.040 M HClO4
Compound A (C9H12) absorbed 3 equivalents ofH2 on catalytic reduction over a palladium catalyst to give B (C9H18). On ozonolysis, compoundA gave among other things, a ketone described ascyclohexa
Arvin the Ant is on a picnic table. He travels 30 cm eastward, then 25 cm northward, and finally 15 cm westward. What is the magnitude of Arvin's net displacement?
A pirate ship fires a 25kg cannonball with a velocity of 100m/s at another very heavy trader ship. the ship is at rest. the cannonball bounces off with a velocity of -0.5m/s. a) How much energy was
An object moves at a constant velocity of 11 m/s to the southwest for an interval of 20 s. Halfway through this interval, what is the magnitude of its instantaneous velocity?