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Chp. 4
4-1 4-2 part of 4-3
14
Chemistry
10th Grade
10/02/2008

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Cards

Term
What did Aristotle study/do.
Definition
Politics, ethics, nature, physics, and astronomy.
Term
Name 3 things that make up an atom, their charges, and the abbreviation.
Definition
Proton = p+ (1+) positive

Electron = e- (1-) negative

Neutron = n(little o) neutral
Term
Define Atom.
Definition
The smallest part of any element that retains the properties of that element.
Term
What did William Crooke do to find a negatively charged particle? And how does it work?
Definition
He created the Cathode Ray. There is a tube with cathode and anode in it. Then there is pressured gas inside. The ends are attached to a voltage source.
Term
Who was the "true" founder of an electron. What was his model for an atom.
Definition
J.J Thompson. He thought of the plum-pudding model. Where the electrons just float around.
Term
What where Democritus thoughts about and atom?
Definition
1. Matter has empty space and atoms are moving.

2. Atoms are solid, homogenous, indivisible, and indestructible.

3. Different shape and sizes of atoms.

4. Properties= size, shape, movement of atoms.

5. Changes are from grouping of atoms, not changing them.
Term
What did John Dalton think about the atom?
Definition
1. All matter is composed of small particles called atoms.

2. Atoms of a given element are identical= size, mass, chemical properties. Atoms of different elements are different.

3. Atoms cannot be created, destroyed, and cannot be divided.

4. Atoms of different elements form compounds in small whole number ratios.

5. chemical reaction= atoms are seperated combined, or rearranged.
Term
Robert Millikan came up with the official of the electron what was it?
Definition
(1-)
Term
Ernest Rutherford modified the plum pudding model. Describe it.
Definition
There are alpha particles that move through the atoms and slightly bump off of electrons and change direction.
Term
Ernest Rutherford changed his modified plum pudding model in 1911 describe this new model.
Definition
There is a nucleus with positive protons in it. Electrons are outside the nucleus and alpha particles move through the atom and bounce off the electrons and change direction.
Term
Who did the Gold Foil experiment?
Definition
Ernest Rutherford
Term
What did James Chadwick find out?
Definition
There are neutrons they are neutral particles and have a mass.
Term
Who found the:

Proton

Electron

Neutron
Definition
Proton= Rutherford

Electron=J.J Thomson

Nucleus= Chadwick
Term
What did people believe in before the idea of an atom?
Definition
Air
hot wet
Fire Water
dry cold
Earth
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