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Chapter 3
How Matter Changes
20
Science
Not Applicable
04/11/2005

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Term
Acid
Definition
A compound that turns blue litmus paper to red and forms a salt.
Term
Electron
Definition
A negativly charged particle in an atom.
Term
Ion
Definition
A negativly charged particle in an atom
Term
Neutron
Definition
A particle in the nucleus of an atom that has no electric charge
Term
Proton
Definition
A positivily charged particle found in the nucleus of an atom
Term
Atomic Number
Definition
The number of protons in the nucleus of an atom of an element.
Term
Chemical Bond
Definition
A force, or link that holds atoms together in a molecule or in a crystal. Ex. Water Molecule
Term
Chemical Change
Definition
A change in matter that results in a new substance with new properties.
Term
Netralization
Definition
The reaction between an acid and a base
Term
Physical Change
Definition
A change in size shape or state of matter with no new kind of matter being formed
Term
Radio-active
Definition
An element made up of atoms whos nuclei breaks down.
Term
Nuclear Fission
Definition
The splitting of the nucleus of an atom,releasing great amounts of energy.
Term
Base
Definition
A compound that turns red limus paper blue and that forms a salt when it reacts with an acid
Term
Indicator
Definition
A substance that changes color when mixed with an acid or base.
Term
Polymer
Definition
A compound consisting of large molecules formed from many smaller linked molecules.
Term
Model
Definition
Something used or made to represent an object or an idea
Term
Nucleus
Definition
The dense central part of an atom
Term
Salt
Definition
A compound that can be formed when an acid reacts with a base
Term
Molecule
Definition
A particle made up of a group of atoms that are chemically bonded
Term
Atom
Definition
The smallest particle of an element that has the chemical properties of that element
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