A 1.000 mL aliquot of a solution containing Cu2 and Ni2 is treated with 25.00 mL of a 0.03443 M EDTA solution. The solution is then back titrated with 0.02270 M Zn2 solution at a pH of 5. A volume of 20.01 mL of the Zn2 solution was needed to reach the xylenol orange end point. A 2.000 mL aliquot of the Cu2 and Ni2 solution is fed through an ion-exchange column that retains Ni2 . The Cu2 that passed through the column is treated with 25.00 mL of 0.03443 M EDTA . This solution required 16.17 mL of 0.02270 M Zn2 for back titration. The Ni2 extracted from the column was treated witn 25.00 mL of 0.03443 M EDTA . How many milliliters of 0.02386 M Zn2+ is required for the back titration of the Ni2+ solution?

The tendency of water molecules to stick together is referred to as a) adhesion b) polarity c) cohesion d) transpiration e) evaporation

Problem page combustion of hydrocarbons such as pentane ( c5 h12 ) produces carbon dioxide, a "greenhouse gas." greenhouse gases in the earth's atmosphere can trap the sun's heat, raising the average temperature of the earth. for this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.(a) write a balanced chemical equation, including physical state symbols, for the combustion of liquid pentane into gaseous carbon dioxide and gaseous water. (b) suppose 0.350 kg of pentane are burned in air at a pressure of exactly 1 atm and a temperature of 20.0 degree c. calculate the volume of carbon dioxide gas that is produced.be sure your answer has the correct number of significant digits.

Which type of fossil does this image depict?