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Why is a buffer composed of HC2H3O2 and NaC2H3O2 more effective maintaining the pH of a solution at pH 4.75 than is a buffer composed of HCN and NaCN?
A 250 mL stock solution contains 2.3 M Ca(CN)2. When 100 mL of the stock solution is diluted to 125 mL, how many moles of CN- ions will be contained in the dilute solution?
Calculate the mass of glucose in a 105 sample of a 1.18 glucose solution.
The half-life of strontium-90 is 28 years. How many grams of this nuclide in a 4.00 g sample will remain after 112 years?
Calculate the mass of hydrogen per oxide needed to obtain0.460Lof oxygen gas at STP. 2H2O2(aq) → 2H2O(l) + O2(g)
A 1.00-g sample of carbon from a modern source gave 22 080 disintegrations per day. If the decay constant of carbon-14 is 1.2 × 10-4 y-1, what is the age of the dish?
For the following reaction, label the acid, base, conjugate acid, and conjugate base. Given the following values for Ka, circle the stronger acid and stronger base and predict whether the equilibriu
He slides so that his speed is zero just as he reaches the base. How much mechanical energy is lost due to friction acting on the runner?
What is the structural formulas of the compound and explain how you got your answer?
Suppose that you developed your own new temperature scale, denoted oN. You chose 30.0oN. What would be the temperature at which phosphorus melts (44oC) on your new temperature scale?
A metal rod connects the beakers. Five minutes later, the temperature of Beaker A is 75°C and the temperature of Beaker B is 50°C. What might the temperatures be after another five minutes h
The car collides and becomes stuck to a 5000kg truck travelling west at along South Street at the intersection of South Street and Murdoch Drive. What is the final velocity of the vehicles after the
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?