Download “earth, air, fire and water" matter was composed of small particles

Early Models of the Atom: 500 BC-1803
Objectives:
 trace the development of atomic theory from 500 BC-1803
 explain and demonstrate the principles in Dalton’s Atomic Theory
Greek Philosophers (Aristotle)
“earth, air, fire and water"
Democritus
matter was composed of small particles called "atoms" that could be
divided no further
Lavoisier
mass of reactants in the container before a chemical reaction was equal
to the mass of the products after the reaction (Law of Conservation of
Mass/Matter)
Law of Conservation of Mass (Matter)-
when a chemical reaction occurs, mass is neither created nor destroyed
but only changed
Proust-
the composition of water is always 11 percent hydrogen and 89 percent
oxygen by mass
Law of Definite Proportion-
elements that composed the compounds were always in a certain
proportion by mass
Dalton and his Atomic Theory
1. Matter is composed of tiny, indivisible particles known as atoms.
 This is incorrect because: atoms can be subdivided into protons,
neutrons, and electrons
2. Atoms of the same element are identical, and atoms of any one element are
different from those of another element.

This is incorrect because: there are isotopes (defined later in this
chapter)
How can I justify the structure of the atom based
on historical experimentation?
T. O’Toole
3. Reactions occur when atoms are separated from one another, joined, or
rearranged, but matter cannot be created or destroyed. This is the Law of
Conservation of Mass (Matter).
4. Atoms of different elements can combine in whole number ratios to form
compounds
a. Law of Definite Proportion-use water to identify the ratios:
i. Ratio of atoms
ii. Ratio of moles
iii. Ratio of %
iv. Ratio of mass
b. Law of Multiple Proportion
definition- different chemical combinations of the same
elements forming different compounds
example- K2CrO4 and K2Cr2O7
Minute Paper (also on Portfolio Page)
How do I get from where I am to where I’m going?
The 10 Minute Makeover
How can I justify the structure of the atom based
on historical experimentation?
T. O’Toole
Customize your learning by choosing from the following options each night
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Complete the appropriate section on the Portfolio Page
Complete SYS Assignment related book work
Review the PPT file on the website
Read pages 107-108 in the book
Answer question #1 on page 108. The answer is in Appendix C.
Practice this lesson using :
http://www.quia.com/jg/1207715list.html

Check out this quiz
http://antoine.frostburg.edu/chem/senese/101/atoms/daltonquiz.shtml on Dalton’s Atomic Theory in the Extra Practice tab of
the LiveBinder at the bottom of the chapter page of the website
Review the skills from today’s Train Your Brain
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How can I justify the structure of the atom based
on historical experimentation?
T. O’Toole