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Show the complete mechanism for the addition of HBr to 5,5 dimethyl- 1,3 cyclopentadiene at room temp
A 5.40 cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.510 T pointing up. During the course of 0.130 s, the field is changed to one of 0.300 T
Molecules can be as small as a few atoms or as large as thousands of atoms. In 1962, Max F. Prutz and John C. Calculate the formula mass of hemoglobin.
Calculate the change in enthalpy when ammonium nitrate decomposes and show whether it is endothermic or exothermic.
Calculate the final temperature of 33 of ethanol initially at 20 upon absorption of 649 of heat. (density of ethanol =0.789 )
A car is driven 100 km west and then 90 km southwest. What is the displacement of the car from the origin? Assume the blocks are equal length.
What is the concentration (molarity) of chloride ions after combining 49.7 mL of 0.383 M barium chloride with 14.1 mL of 0.590 M cobalt(II) chloride?
How would you handle the response, and how would you determine the proper type of PPE to be used in this incident? What type of PPE would you recommend?
A girl is pressing a book against a vertical wall. If the coefficient of friction between the book and the wall is .35, how hard would she have to push in order to allow the book to slide down at co
What is the solubility product constant? Given Ksp = 1.1 x 10^-3 for BaF2(s), calculate the molarity of Ba+2 in a saturate solution of BaF2 (at equilibrium). Calculate the molarity of Ba+2 when BaF
Assuming that fluorine-18 has a half-life of 109 minutes how long will it take for the level of fluorine-18 in the body to drop to 10% of its initial value?
An automobile club plans to race a 750 kg car at the local racetrack. The car needs to be able to travel around several 175 m radius curves at 91 km/h. What should the banking angle of the curves be
Why is the amount of limiting reagant-not the excess reagnet-always used to predict the mass of products formed?
What volume of a concentrated { HCl} solution, which is 36.0% { HCl} by mass and has a density of 1.179 {g/mL}, should be used to make 5.30L of an {HCl} solution with a {pH} of 1.7?
An unknown salt is either NaF, NaCl or NaOCl.When 0.050 mol of the salt is dissolved in water for form 0.500 L of solution, the pH of the solution is 8.08. What is the identity of the salt?
Four 1.8 kg masses are located at the corners of a square 0.20 m on each side. Find the magnitude and direction of the gravitational force on a fifth 1.8 kg mass placed at the midpoint of the bottom
What mass of sucrose should be combined with 488 of water to make a solution with an osmotic pressure of 8.25 at 280?
Consider a general polyprotic acid system with equilibria between species H2A+, HA, and A-. Rather than starting with the diprotic form of the acid (as in Problem 1), suppose that you made a solutio
Draw the structure of histidine in each ionization state. What is the net charge of the histidine molecule in each ionization state?
What is the Molarity of a solution prepared by diluting 55mL of .65 M hydrochloric acid solution to a final volume of 155mL by adding water?
Suppose that you wanted to prepare a acetate ion /?acetic acid buffer solution with a pH of 4.35. What is the value of [A-?] /?[HA] for the correct buffer solution for this event?
A cylinder containing 10.0 L of helium gas at a pressure of 165 atm is to be used to fi ll toy balloons to a pressure of 1.1 atm. Each inflated balloon has a volume of 2.5 L. What is the maximum num