CHM 111 Chapter 2

Question 1

Robert Boyle (1627-1691)

Answer 1

Provided evidence for atoms, and defined the nature of an element.

Question 2

Joseph Priestley (1733-1804)

Answer 2

Isolated oxygen gas from mercury oxide (HgO) by decomposition.

Question 3

Antoine Lavoisier (1743-1794)

Answer 3

Showed that the mass of a compound is preserved. Posited the Law of the Conservation of Mass.

Question 4

John Dalton (1766-1844)

Answer 4

Proposed a system of explanations for the Law of the Conservation of Mass and the the Law of Definite Proportions.

Question 5

J.J. Thomson (1856-1940)

Answer 5

Discovered electrons using a cathode-ray tube, and determined that electrons are negatively charged.

Question 6

R.A. Millikan (1868-1953)

Answer 6

Determined the mass of an electron through the oil drop experiment. Put a number on the strength of the electric charge.

Question 7

Ernest Rutherford (1871-1937)

Answer 7

Performed gold foil experiment. Discovered the nucleus. We now have evidence of the positively charged component of the atom.