Classification of Matter Section 1.1 Composition of Matter.
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Transcript of Classification of Matter Section 1.1 Composition of Matter.
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Classification of MatterSection 1.1 Composition of Matter
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Warm upWhat is matter?
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Objectives
Define substances and mixtures.
Identify elements and compounds.
Compare and contrast solutions, colloids and suspensions.
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Matter can be: substance or mixture
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What is a substance?
A pure substance is a type of matter with a fixed proportion.
A substance can be either:
1- element
2- compound
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What is an element?
An element is a
substance whose atoms
have the same identity.
Examples of
elements are:
1- graphite in your pencil
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Copper
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What is a compound?A compound is a substance in which the atoms of
two or more elements are combined in fixed proportion.
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A compound can be broken down into simpler substances by chemical mean only.
Compounds have different properties than the elements that make them.
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Mixtures
A mixture is made up of two or more substances that can be easily separated by physical means.
Examples of mixtures:
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Types of mixtures
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Homogeneous mixture
Is a mixture that is the same throughout.
One phase
Uniformly mixed
Small particles
Particles don’t settle down
Solution is another name of a homogeneous mixture
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Heterogeneous mixtureIs visibly different
throughout.
Not uniformly mixed
More than one phase
Larger part
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Tyndall effect
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Summary Atom is the smallest basic unit of matter.
Matter can be either a substance or a mixture.
Substance can be either an element ( one type of atom) or a compound (two or more types of atoms)
In a compound elements are combined chemically (in specific ratio) and it has different properties than the elements.
A mixture is a combination of different materials that can be easily separated by physical means.
Two types of mixtures: heterogeneous and homogeneous.
Two types of heterogeneous mixtures are colloid (particles don’t settle) and suspension (particles are heavy enough to settle)
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Homework
Section review questions page: 456
# 1 to 5