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Midterm Study Guide
Chemistry + Physics (8th Grade) √
10
Chemistry
8th Grade
03/09/2005

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Cards

Term
characteristics are color, hardness, flammability, smooth, etc.
Definition
Properties of Matter
Term
2 or more substances NOT chemically combined
Definition
Mixtures
Term
can not be broken down to an element
Definition
Substance
Term
a substance that cannot be broken down into another substance by physical or chemical means
Definition
Elements
Term
a substance made of two or more elements chemically combined
Definition
Elements
Term
does not create a new material or change appearence
Definition
Physical Change
Term
produces a new substance
Definition
Chemical Change
Term
(A) atom is a nucleus surrounded by negative electrons
(B) nuclei contains protons and neutrons
(C) protons are positive
(D) neutrons have no charge
(E) electrons - negative charge
(F) # of protons = # of electrons = atomic #
(G) # of neutrons is ca
Definition
Atomic Structure
Term
number of electrons on the outer shell (8 of these=stable)
Definition
Valence Electrons
Term
metals to the left of the zigzag line- each group has the same # of electrons (elements on the left are very reactive, those on the right side are least reactive; 8 valence electrons=stable)
Definition
Periodic Table Organization
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