CHEMISTRY 9-22 BELL WORK
Describe the differences between
Aristotle’s atomic theory and
Democritus’s atomic theory (min 2
complete sentences)
You may use your notes from
last class to help you.
READIN / DISCUSSION
Read Atomic Theory Handout
(Paragraph 1 & Paragraph 2)

 Follow
instructions on packet.
 When done turn to a partner and
read the 2 notes you took (on each
paragraph).

Aristotle was a rock star, so his
theory prevailed until….
2,000 YEARS LATER….
John Daulton
 (1766-1844)- revived ole’ Democritus
 Performed experiments and
numerous reactions
 Read table 4.2 on p.104 and draw on
your notes what his model looked
like

JOHN DAULTON ATOMIC MODEL

Draw you theory of what Daulton’s model looked
like
READIN / DISCUSSION
Read Atomic Theory Handout
(Paragraph 3, Discovery of the
Electron)

 Follow
instructions on packet.
 When done turn to a partner and
read the 2 notes you took.
Balloons & Paper
http://www.youtube.com/watch?v=O9Goy
scbazk
JJ THOMPSON
Cathode ray tube (CRT)
 Observed and measured negatively charged
particles when using a magnet
 Determined mass/charge ratio
 “Plum pudding” (chocolate chip cookie) model

+
-
-
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READIN / DISCUSSION
Read Atomic Theory Handout
(Paragraph 4, The First atomic
models)

 Follow
instructions on packet.
 When done turn to a partner and
read the 2 notes you took.
TOTD

Explain the difference between Daulton’s Atomic
Theory and JJ Thompson’s atomic theory.
(minimum 3 complete sentences).