Assume the following potential energies for a Newman projection: anti Me/H or anti Me/Me = 0 kcal/mole; eclipsed H/H = 4 kcal/mole; eclipsed Me/Me = 8 kcal/mole; gauche H/H and gauche H/Me = 0 kcal/mole; gauche Me/Me = 4 kcal/mole For 2,3-dimethylbutane, when drawing a Newman projection viewing down the C2-C3 bond, what is the potential energy of the most stable Newman projection?

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next

Which statement characterizes synthetic polymers? a. they come from animals and plants. b. they are found in nature. c. they are made in a lab. d. they are components of starch.

If a 20.0ml test tube measures 15.0cm, what is the length in meters?