I answered a question correctly and someone deleted my answer without giving me any explanation. I don't know why someone would do that but its really rude. Like someone is trying to help others and you are deleting their answers. What is this?? I am not going to answer any questions from now on.

The tilt of the earth's axis of rotation is responsible for the a) ocean's tides. b) size of the moon. c) brightness of stars. d) earth’s seasons.

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

What is the vapor pressure of a solution with a benzene to octane?