Physical%20Science

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Physical Science
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Chapter 2Matter

• Section 2.1
• What is Matter? (p. 38)

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Objectives

• Understand the nature of matter
• Differentiate between a pure substance and a
  mixture

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Chemistry- study of compositions, structures,
properties, and its changes and interactions
I. Composition (chart on p. 39) Matter- anything
that has mass and occupies space
A. Atoms 1. Element- not made of any other
substance- cannot be broken down by
chemical means
2. Atom- smallest part of an element that still
retains all properties of the element
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B. Elements combine chemically to form compounds
Molecule- smallest part of a compound that
still retains all properties of the compound
C. Chemical formula- 2 C6H12O6
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II. Pure Substances and Mixtures A. Pure
substance- substances with fixed
compositions with definite properties
Can be an element or a compound
B. Mixture- 2 or more substances not
chemically combined (sub. keep their
individual properties)
1. Classified by how thoroughly they
are mixed
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a. Heterogeneous mixture- not thoroughly
mixed, particles are of different sizes
b. Homogeneous- thoroughly mixed, particles
of similar size
2. Two or more liquids mixed a. Miscible- will
dissolve into each other b. Immiscible- will
not dissolve