Select all that apply. which of the following are homogeneous solutions? salt water air sand and water vinegar cement

What is the temperature of one mole of helium gas at stp?

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

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.