Which item is an alloy? a bowl of salsa a bottle of salad dressing a metal cooking pot a cake made with gelatin

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?