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Two samples of calcium fluoride are decomposed into their constituent elements. The first sample produced g of calcium and g of fluorine. If the second sample produced 294mg of fluorine, how many g of calcium were formed?
what is delta Urxn for the combustion X; the hardware compnent of the calorimeter has a heat capcity of 3.63kj/*c. the specific heat of water is 4.184j/g*c the MW of X is 56.0 g/mol
determine the ph of the following solutions, showing calculations.
What type of chemical reaction is the following?
Cesium-137 has a half-life of 30 years. You begin with a 20.0 g sample of Cs-137. How many half-lives occur if you wait a total of 60 years?
A thermos bottle containing milk is shaken vigorously. Consider the milk as the system. (a) Will the temperature rise as a result of the shaking? (b) has heat been added tot he system? (c) Has work been done on the system? (d) Has the system's int..
Trimethylamine (CH3)3N is a substance responsible in part for the smell of fish. it has a boiling point of 3.5 degrees c and a molecular weight of 59.1.
when mixture A at 273 K is heated to 473 K, mixture B results. How many different chemical changes occur? How many different physical changes occur?
The proteins in the mixture are separated by chromatography. You have reason to believe that your unknown protein is an enzyme which catalyzes the cleavage of phosphodiester bonds.
What is the energy change when the temperature of 12.3 grams of solid tin is decreased from 38.1 C to 24.7 C
Draw Fisher projections for the following: (a) (R)-2-chloropentane; (b) (2R,3S)-2,3-dichlorobutane; (c) (S)-2-Bromo-2-pentanol;
Calculate the pH of 0.0021 M aminoethanol (pKa = 9.38) in 0.0030 M sodium aminoethanoate (a salt of the conjugate base of aminoethanol).
Aqueous solutions of ammonium sulfide, (NH4)2S, and Hg(NO3)2 react to produce HgS and NH4NO3. a. Write the overall balanced equation for the reaction. Indicate the state (s, aq) for each compound. b. Name each compound. c. What type of reaction is..
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