© copyright pearson prentice hall slide 1 of 18 tuesday!!!!! 10/18/11 bell ringer 1. pick up your...

© Copyright Pearson Prentice Hall

Slide 1 of 18

Tuesday!!!!!10/18/11

Bell Ringer

• 1. Pick up your papers from the corner desk.

• 2. Get out paper to take notes and your 3-ring binders for this class.

Schedule

1. Bell Ringer

2. Pass back papers

3. Atomic Structure notes

HOMEWORK: depends on how you work today.

Chemistry

Teachers open the door, but you must enter by yourself. I CAN… read for meaning

and analytically answer questions.


Slide 2 of 18

Defining the Atom

The lab technician shown here is using a magnifying lens to examine a bacterial culture in a petri dish. When scientists cannot see the details of what they study, they try to obtain experimental data that help fill in the picture.

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Defining the Atom > Early Models of the Atom

Early Models of the Atom

• An atom is the smallest particle of an element that retains its identity in a chemical reaction.

• Philosophers and scientists have proposed many ideas on the structure of atoms.

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Defining the Atom >

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Early Models of the Atom

Democritus’s Atomic Philosophy

How did Democritus describe atoms?

Democritus

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Democritus believed that atoms were indivisible and indestructible.

Democritus’s ideas were limited because they didn’t explain chemical behavior and they lacked experimental support.

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Dalton’s Atomic Theory

How did John Dalton further Democritus’s ideas on atoms?

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By using experimental methods, Dalton transformed Democritus’s ideas on atoms into a scientific theory.

The result was Dalton’s atomic theory.

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All elements are composed of tiny indivisible particles called atoms.

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Atoms of the same element are identical. The atoms of any one element are different from those of any other element.

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Atoms of different elements can physically mix together or can chemically combine in simple whole-number ratios to form compounds.

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Chemical reactions occur when atoms are separated, joined, or rearranged. Atoms of one element are never changed into atoms of another element in a chemical reaction.

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Defining the Atom >

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Sizing up the Atom

Sizing up the Atom

What instruments are used to observe individual atoms?

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Defining the Atom > Sizing up the Atom

Despite their small size, individual atoms are observable with instruments such as scanning tunneling microscopes.

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Defining the Atom > Sizing up the Atom

Iron Atoms Seen Through a Scanning Tunneling Microscope

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Section Quiz

-or-Continue to: Launch:

Assess students’ understanding of the concepts in Section

4.1 Section Quiz

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4.1 Section Quiz

1. The ancient Greek philosopher credited with suggesting all matter is made of indivisible atoms is

a. Plato.

b. Aristotle.

c. Democritus.

d. Socrates.


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4.1 Section Quiz

2. Dalton's atomic theory improved earlier atomic theory by

a. teaching that all matter is composed of tiny particles called atoms.

b. theorizing that all atoms of the same element are identical.

c. using experimental methods to establish a scientific theory.

d. not relating atoms to chemical change.


Slide 18 of 18

4.1 Section Quiz

3. Individual atoms are observable with

a. the naked eye.

b. a magnifying glass.

c. a light microscope.

d. a scanning tunneling microscope.

END OF SHOW

© copyright pearson prentice hall slide 1 of 18 tuesday!!!!! 10/18/11 bell ringer 1. pick up your...

Documents

atom slide

atom early models

atom chemical reactions

atom daltons atomic

individual atoms

structure of atoms

democrituss ideas

chemical behavior