Chapter 11:1 Atoms, Elements, Compounds, and Mixtures Atomic Models - Democratis - Rutherford

1. Chapter 11: Atoms, Elements, Compounds, and Mixtures Table of Contents Section 3: Compounds and Mixtures Section 1: Models of the Atom Section 2: The Simplest Matter

35. 1 Section Check Question 1 Explain why early Greek philosophers thought that matter was composed of atoms. NC: 1.05

36. 1 Section Check Answer The early Greeks didn’t do experiments; they relied only on reasoning. They reasoned that if you kept cutting something in half, eventually you would have a piece so small it couldn’t be cut any more. NC: 1.05

37. 1 Section Check Question 2 The first modern atomic theory was proposed by _______. A. Aristotle B. Dalton C. Rutherford D. Thompson NC: 4.03

38. 1 Section Check Answer The answer is B. John Dalton was a 19th century English school teacher. He thought atoms were tiny, hard spheres. NC: 4.03

39. 1 Section Check Question 2 A cathode-ray tube has two electrodes, one at either end. These are known as the _______ and the _______. NC: 1.07

40. 1 Section Check Answer The answer is cathode and anode. Sometimes a cathode-ray tube is abbreviated to CRT. NC: 1.07