Which if the following containers does not contain any compounds?

How does litmus paper indicate an acid?

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.

Explain what happens at the saturation point when adding salt to water at room temperature.