What type of energy travels through space as waves?

What is important to study for nios grade 12 chemistry? i have only one month left.

If a reactant was removed, did the new equilibrium system shift to make more reactants or more products?

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.