Is it possible to change a scientific theory? a. yes, scientific theories are constantly being changed in major ways. b. yes, but changes are usually small and are made only if important new evidence is found. c. no, scientific theories are never changed and scientists always believe they are correct. d. no, scientific theories are never changed, but they are frequently replaced by new theories.

Select the correct text in the passage. which sentences describe examples of sustainable living? i live in an old apartment building downtown, but my company is based in an office park on the outskirts of the city. i drive an old car that needs to be replaced. i plan to buy a hybrid for better gas mileage, but for now i am able to carpool with a couple of friends from work. the drive to the office park is about 45 minutes each way, but we do get to work in a modern building. the architects just received a leed certification for the design.

Which substance—wood or silver—is the better thermal conductor? a thermal conductor is a material that requires very little heat energy to change its temperature. explain your answer.

Which compound should undergo substitution of the bromine by phenolate anion? draw the structure of the organic product?