classification of matter section 1.1 composition of matter
TRANSCRIPT
Classification of MatterSection 1.1 Composition of Matter
Warm upWhat is matter?
Objectives
Define substances and mixtures.
Identify elements and compounds.
Compare and contrast solutions, colloids and suspensions.
Matter can be: substance or mixture
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
What is an element?
An element is a
substance whose atoms
have the same identity.
Examples of
elements are:
1- graphite in your pencil
Copper
What is a compound?A compound is a substance in which the atoms of
two or more elements are combined in fixed proportion.
A compound can be broken down into simpler substances by chemical mean only.
Compounds have different properties than the elements that make them.
Mixtures
A mixture is made up of two or more substances that can be easily separated by physical means.
Examples of mixtures:
Types of mixtures
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
Heterogeneous mixtureIs visibly different
throughout.
Not uniformly mixed
More than one phase
Larger part
Tyndall effect
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)
Homework
Section review questions page: 456
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