Properties of Matter
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Transcript of Properties of Matter
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Properties of Matter
Chapter 15
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Pure Substances
• A pure substance, or simply a substance, is a type of matter with a fixed composition. This means it is made of the same stuff.
• A substance can be either an element (like gold) or a compound (like salt).
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• All substances are built from atoms. If all the atoms in a substance have the same identity, that substance is an element.
• The graphite in your pencil point and the copper coating of most pennies are examples of elements.
Elements
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• Table salt is a chemical compound. Compounds are composed of two or more elements bound together. It is composed of sodium and chlorine.
Compounds
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• A mixture, such as the pizza or soft drink shown, is a material made up of two or more substances that can be easily separated by physical means.
Mixtures
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• Unlike compounds, mixtures do not always contain the same proportions of the substances that make them up.
Heterogeneous Mixtures
• A mixture in which different materials can be distinguished easily is called a heterogeneous (he tuh ruh JEE nee us) mixture.
• On the slide before, which one was heterogeneous? The soda or the pizza?
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• Soft drinks contain water, sugar, flavoring, coloring, and carbon dioxide gas.
Homogeneous Mixtures
• Soft drinks in sealed bottles are examples of homogeneous mixtures.
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• Another name for homogeneous mixtures like a cold soft drink is solution.
Homogeneous Mixtures
• A solution is a homogeneous mixture of particles so small that they cannot be seen with a microscope and will never settle to the bottom of their container.
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Concept Connections