Why does hot air rise and cold air sink? A. Cold air has more kinetic energy than hot air.
B. Hot air has more potential energy than cold air.
C. Cold air is more dense than hot air.
D. Hot air is more dense than cold air.

What type of reaction is zn + cucl2 → cu + zncl2?

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.

When electrolyzing copper (ll) chloride, what reaction takes place at the anode? what reaction takes place at the cathode?