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A coin dealer, offered a rare silver coin, suspected that it might be a counterfeit nickel copy. The dealer heated the coin, which weighed 18.0 g to 100°C in boiling water and then dropped the hot coin into 26.5 g of water at T = 16.5°C in an insulated coffee-cup, and measured the rise in temperature. If the coin was really made of silver, what would the final temperature of the water be (in °C)? (for nickel, s = 0.445 J/g°C; for silver, s = 0.233 J/g°C )
Lactic acid is a monoprotic acid with a Ka of 1.4 x 10-4. What is the percent ionization of a 0.100 M lactic acid solution in the absence and presence of 0.0500 M sodium lactate
Imagine that a chemist has cyclohexanone, triphenylphosphine, butyllithium, and 2-bromobutane. Draw the organic product resulting from using these chemicals in the Wittig reaction.
What will happen to the retention time if the temperature of the column is increased. Calculate the following peak areas from your GC chromatogram.
Acetylene gas (C2H2) is produced as a result of the following reaction. CaC2(s)+2H2O(l) = C2H2(g)+Ca(OH)2(aq) . If 32.0 g of CaC2 are consumed in this reaction, how many moles of H2O are needed?
the temperature decreases by 0.2010 K. Calculate the molar heat of solution of KCN.
Reversible adiabatic processes are isentropic. Are isentropic processes necessarily reversible and adiabatic?
What substance (element on the periodic table) resides at the heart of the structure of vitamin B12? 2 points
For an enzyme that follows simple Michaelis-Menten Kinetecs, what is the value of Vmax if Vo is equal to 1mmnol -1 minute when [s] = 1/10Km?
The pKb values for the dibasic base B are pKb1 = 2.1 and pKb2 = 7.8. Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.75 M B(aq) with 0.75 M HCl(aq).
how many kilojoules and kilocalories of heat are required to raise 40.0 g of water from -12 degrees Celsius to 130 degrees Celsius?
Consider the reaction H2(g) + Br2(g) 2 HBr(g), which is exothermic as written. What would be the effect on the equilibrium position of adding a suitable catalyst
In the molecular orbital model of the cyclopentadienyl cation, how many pairs of degenerate pi-antibonding molecular orbitals are there
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