Matter
Published on Dec 09, 2015
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PRESENTATION OUTLINE
Pure Sybstance
Aka substance
A type of matter with a fixed composition. Can be an element or a compound.
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There are about 90 elements on Earth. Over 20 have been made in labs, but most are unstable.
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Compound
A substance in which the atoms of 2 or more elements are combined in a fixed proportion.
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Homogenous Mixture
A mixture with two or more substances evenly blended together.
Photo by Derek K. Miller
Colloids
Mixtures with larger particles that do not settle out.
Photo by Erika Hall
Colloids can be detected using light. If the particles scatter light you can tell the mixture is a colloid. This is the Tyndall Effect.
Photo by Steve took it
Suspension
Liquid in which visible particles settle out. Ex: pond water
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A physical property is any characteristic that you can observe without changing the identity of the substances in the material.
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Physical change involves altering the physical properties but not the identity of the materials.
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Chemical properties are characteristics of a substance that indicate whether it can undergo a certain chemical change.
Ex: flammability
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Chemical change is when a substance changes it's identity. There is a change from one substance to another.
Ex: a rusty bike, alka-seltzer in a glass of water.
Photo by Leo Reynolds
Detecting Chemical Change
Clues such as heat, cooling, formation of bubbles, or solids forming in a liquid
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Remember that mass is conserved, so it cannot disappear.
Turn books to page 463
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