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What effect did the addition of acetanilide have on the melting point of the unknown component? What about the addition of phenacetin?
The Common Ion Effect. What is the pH of a solution that contains 0.250-M benzoic acid and 0.600-M sodium benzoate?
Sodium methoxide reaction: Pipet 1.65 mL of a 25% (by weight) solution of sodium methoxide in methanol into a 10 mL reaction flask.
How many molecules of carbon dioxide are produced when 130 molecules of acetylene (HCCH) to react in excess oxygen produce carbon dioxide and water.
There are 2.2 mg of lead in exactly 500 g of a water sample. What would the concentration of lead be in parts per million? Round to the nearest tenth. Don't forget the units
If the Ka of a monoprotic weak acid is 8.0 × 10-6, what is the pH of a 0.41 M solution of this acid
Which of the following is an experimental fact that valence bond theory cannot explain, but molecular orbital theory can? A) the paramagnetism observed for O2
calculate enthalpy change for the quantity of zinc reacted. Be sure to follow the significant figures convention in the answer you report.
Among the electrolytes Na2SO4, CaCl2, Al2(SO4)3 and NH4Cl, the most effective coagulating agent for Sb2S3 sol is
At a higher temperature, 373K, dinitrogentetraoxide partially decomposes according to the same equilibrium reaction but with slightly different results. The chemical equation is again
The heat of vaporization of CCl2F2 is 289 J/g. What mass of this substance must evaporate to freeze 165 g of water initially at 15°C? (The heat of fusion of water is 334 J/g; the specific heat of water is 4.18 J/g-K.)
How much heat (in kilojoules) is evolved or absorbed in the reaction of 3.05 of with enough carbon monoxide to produce iron metal?
Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken
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