When many students measure the concentration of the same solution for a chemistry course laboratory assignment, do their measurements follow a normal distribution?

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?

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form