Transcription of Chapter 2 Atoms, Molecules, and Ions
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Chapter 2 Atoms, Molecules, and Ions
Atoms, molecules , and Ions Chapter 2 Atoms, molecules , and Ions Jim Geiger Cem 151 Atoms, molecules , and Ions Atomic Theory of matter The theory of atoms: Original to the Greeks Leuccipus, Democritus and Lucretius (Aristotle thought they were nuts) He believed that one could divide up a piece of matter an infinite number of times, that is, one never came up with a piece of matter that could not be further divided. He suggested that everything in the world was made up of some combination of four elements: earth, fire, water, and air. The elements were acted upon by the two forces of gravity and levity. Gravity was the tendency for earth and water to sink, and levity the tendency for air and fire to rise. John Dalton (1805-1808) Revived the idea and made it science by measuring the atomic weights of 21 elements.
Atomic Theory of Matter The theory of atoms: Original to the Greeks Leuccipus, Democritus and Lucretius ... the end of a chemical process is the same as the mass of substances present before the process took place. 3H 2 + N 2 2NH 3 ... and observing the change in the beam position on a fluorescent screen. Atoms, Molecules, and Ions
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