Based on the data thomson collected in his experiments using cathode rays, the concept of atomic structure was modified.
which of the following statements about the atomic structure were validated by his cathode ray experiments?

a. particles of the cathode rays are fundamental to all matter.
b. in the atom, the particles of the cathode rays are embedded in a diffuse cloud of positive charge.
c. matter contains a negative charge and by inference positive charge.
d. there are subatomic size particles in an atom.
e. cathode rays have mass.

What are the similarities of physical and chemical change ?

Sulfur dioxide and oxygen react to form sulfur trioxide during one of the key steps in sulfuric acid synthesis. an industrial chemist studying this reaction fills a 25.0l tank with 4.5 mol of sulfur dioxide gas and 4.5 mol of oxygen gas at 30.°c. he then raises the temperature, and when the mixture has come to equilibrium measures the amount of sulfur trioxide gas to be 1.4 mol. calculate the concentration equilibrium constant for the reaction of sulfur dioxide and oxygen at the final temperature of the mixture. round your answer to 2 significant digits.

Drug abuse will not lead to physical and psychological dependence. true or false ?