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Determine the pH of each of the following solutions. (a) 0.399 M benzoic acid (weak acid with Ka = 6.3e-05). (b) 0.558 M boric acid (weak acid with Ka = 5.8e-10). (c) 0.171 M pyridine (weak base wit
A solution is 0.10 M in Pb(NO3)2 and 0.10M in AgNO3. Solid NaI is added until the second solid compound is on the verge of precipitating. Which compound precipitates first and what is the I^- concen
Complete the following table by calculating the missing entries. In each case indicate whether the solution is acidic or basic. pH pOH [H+] [OH -] acidic or basic
A ball falls straight down onto a wedge that is sitting on frictionless ice. The ball has a mass of 3.27 kg, and the wedge has a mass of 5.31 kg. what is the velocity of the ball after the collision
HxCyOz + NaOH --> xH2O + NaxCyOz If 27.33ml of 0.0973M NaOH were used to titrate 0.328g of pure unknown carboxylic acid, determine the number of reactive H in a single molecule of the carboxylic
2 positive charges each is 4 micro C located at the positions (0,0) and (20,0) and all coordinates are in cm, calculate the electric field due to the two charges
Using values from Appendix C of your textbook, calculate the value of Keq at 298 K for each of the following reactions: (a) CH4(g) + 4 Cl2(g) CCl4(l) + 4 HCl(g) Keq = . (b) H2(g) + Br2(g) 2 HBr(g) K
a massive particle, rest mass M absorbs a photon. The inertial mass increases to 1.05 M. Determine the energy of the incoming photon
A beam of 16MeV deuterons (m=2mp) from a cyclotron falls on a copper block. The beam is equivalent to a current of 15 microA. At what rate is thermal energy produced in the block
A certain reaction has Ho = 29.80 kJ and So = 20.80 J/K. (a) Is this reaction exothermic, endothermic or isothermic (neither)? This reaction is . (b) Does this reaction lead to a decrease, an increa
A satellite has a mass of 5825 kg and is in a circular orbit 4.34 × 105 m above the surface of a planet. What would be the true weight of the satellite if it were at rest on the planet's surface
Calculate the standard enthalpy of formation of liquid water (H2O) using the following thermochemical information: 2 C(s) + H2(g) C2H2(g) H = +226.8 kJ CO2(g) C(s) + O2(g) H = +393.5 kJ 2 C2H2(g) +
Determine the kinetic energy of the proton moving in the labarotory towards a stationary electron so that a neutron is the only final particle
A velodrome track is banked so that a bicycle traveling at 78.2 km/h will have no tendency to slip to either side when traveling on the path that has a radius of curvature of 76.0 m
When a 9.15-g sample of solid ammonium nitrate dissolves in 58.4 g of water in a coffee-cup calorimeter (see above figure) the temperature falls from 21.00 oC to 10.88 oC. Calculate H in kJ/mol NH4N
the earth undergoes over a specified period of time the amount of work required to build a house the heat generated by a chemical reaction carried out at constant temperature and pressure the enthal
A solution is prepared by combining .025 mole CaCl2 and .015 mol Pb (NO3)2 and adding water to make 1L of solution. Will a precipitate of PbCl2 form in this solution
At 186 oC the equilibrium constant for the reaction: 2 HBr(g) H2(g) + Br2(g) is KP = 6.56e-11. If the initial pressure of HBr is 0.00753 atm, what are the equilibrium partial pressures of HBr, H2, a
Gaseous NOCl is placed in a closed container at 193 oC, where it partially decomposes to NO and Cl2: 2 NOCl(g) 2 NO(g) + 1 Cl2(g) At equilibrium it is found that p(NOCl) = 0.008460 atm, p(NO) = 0.00
Write ground-state electron configurations for these ions, which play important roles in biochemical processes in our bodies. (Use a noble gas core abbreviation) Na^+, Mg^2+ Cl^- K^+
Common Ion Effect: The Ksp of silver iodide is 8.3 x 10^-17. What is the iodide ion concentration of a 1 L saturated solution of AgI to which .2 mole of AgNO3 is added
Calculate the number of moles of B at each time in the table. 0 s mol 40 s mol 80 s mol 120 s mol 160 s mol (b) Calculate the average rate of disappearance of A for each 40 s interval, in units of m
Calcium fluoride has a Ksp of 3.9 x 10^-11 at 25 C. What is the fluoride ion concentration at equilibrium
Due to decay of ^40K, cow's milk has a specific activity of about 6x10^-11 mCi per milliliter. How many disintegrations of ^40K nuclei are there per minute in 1.0 qt of milk
he Sun has an orbital speed of about 220 km/s around the centre of the Galaxy, Estimate the total mass of the Galaxy in Solar masses