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What chemical reaction takes place when solid sodium sulfide is dissolved? Explain by writing the chemical equation. Include physical states for all species (including liquid for water).
calculate the electric field on the axis of the disk at 5 cm, 10 cm, 50 cm, 200 cm from the center of the disk
A second worker approaches to within 5 meters behind a shield that attenuates 60% and remains there for 20.0 minutes. What is the ration between the absorbed doses for the two workers
Helium gas with a volume of 2.55L , under a pressure of 1.26atm and at a temperature of 44.0?C, How many grams of helium are there? The molar mass of helium is 4.00g/mol
Suppose you have a 9.00V battery, a 2.00 micro-Farad capacitor, and a 7.40 micro-Farad capacitor, find the charge and energy stored if the capacitors are connected to the battery in series
How many milliliters of 0.10 M HCl would have to be added to 100 mL of a saturated solution of PbCl2 in contact with 50.0 g of solid PbCl2 to reduce the Pb2+ concentration to 0.0050 M? (Don't forget
A 0.15g honeybee acquires a charge of 22pCwhile flying. The electric field near the surface of the earth is typically 100N/C, What is the ratio of the electric force on the bee to the bee's weight
A block of mass m1 = 0.57kg is placed on top of another block of mass m2 =0.97kg, What minimum coefficient of static friction between the two blocks will prevent the upper one from slipping
A wooden block with mass 0.33kg rests on a horizontal table, connected to a string that hangs vertically over a friction-less pulley on the table's edge, Find the block's acceleration if k =0.18.
what is the change in temperature of the water after the ice has completely melted? The enthalpy of fusion of water is 6.02 kJ/mol, and the specific heat capacity of the liquid is 4.184 J/g/K. Assum
What is the boiling point of water at an altitude where the ambient air pressure is 0.47 bar? The enthalpy of vaporization of water near its boiling point is 40.7 kJ/mol.
What is the theoretical yield (in mg) of sodium bisulfite adduct of cyclohexanone, assuming that you convert all the starting material to it
Consider a single electron, with a mass of 9.1×10?31kg , subject to a single force equal to the weight of a penny, 2.5×10?2N
If equal volumes of BaCl2(aq) and NaF(aq) solutions are mixed together, which will NOT give a precipitate (Ksp of BaF2 = 1.7 x 10-7)?
Two coins, carrying identical charges, lie 1.5 m apart on a table and a coin experiences a force of 2.0 N, How large is the charge on each
The solubility of AgBrO3 in aqueous solution depends on the presence of other substances in solution. Relative to its solubility in H2O the solubility of AgBrO3
The length of a table in the laboratory was measured as 182.36 cm, What is the relative uncertainty of the length, What is the uncertainty of the length
A 15 pF capacitor is charged to 1 kV and then removed from the battery and connected in parallel to an uncharged 65 pF capacitor
Under what conditions will the endothermic reaction, 2 Na2O(s) <=> 4 Na(s) + O2(g), be spontaneous?
Assume that the Sun radiates like an ideal thermal source at a temperature of 6000 K, What is the intensity of the solar radiation emitted in the range 550.0 nm to 552.0 nm
if 4.3 ml of benzaldehyde are mixed with 1.6 ml of acetone, then calculate the theoretcial yield of dibenzalacetone in grams
Calculate the pH of a solution prepared by adding 20.0 mL of 0.100 M HCl to 80.0 mL of a buffer that is comprised of 0.25 M C2H5NH2 and 0.25 M C2H5NH3Cl. Kb of C2H5NH2 = 9.5 x 10-4
The surface charge density on an infinite charged plane is -1.5*10^-6 N/m^2, How far does the proton travel before reaching its turning point
The lattice points in zinc chloride are occupied by molecules while the lattice points in zinc metal are occupied by atoms.
On a pleasure cruise a boat is traveling relative to the water at a speed of 5.33 m/s due south, What is the magnitude of the passenger's velocity relative to the water