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Published byLeslie Hopkins Modified over 9 years ago
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Chapter 2 – Properties of Matter Section 1 – Classifying Matter
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Key Objectives Why are elements and compounds classified as pure substances? How do mixtures differ from pure substances? What is the main difference among solutions, suspensions, and colloids?
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Matter Chart
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Substances Matter that always has the same composition Table Salt Table Sugar Classified into two categories Elements Compounds
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Elements A substance that cannot be broken down into simpler substances Chopping copper into extremely small particles Atoms – Smallest particle of an element No two elements have the same type of atom
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Element Examples Oxygen Aluminum Iron Gold
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Compounds Substance composed of 2 or more elements and can be broken down into those elements Water Oxygen and Hydrogen Sodium Chloride (Salt) Sodium and Chlorine
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Mixtures Unlike a substance, a mixture does NOT have a fixed composition The parts are not spread evenly throughout it Heterogeneous Mixtures Homogeneous Mixtures
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Heterogeneous Mixtures The parts are noticeably different from one another You can see the different parts Salsa Sand M&Ms Mixed Vegetables
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Homogeneous Mixtures Difficult to distinguish the different parts Appears to contain only one substance Tap Water Kool-Aid Air
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Mixture Types Based on the size its largest particles, a mixture can be classified as a Solution Suspension Colloid
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Mixture Types Solution – Substances dissolve and form a homogeneous mixture Sugar and Water Suspension – A heterogeneous mixture that separates into layers “ Shake well before using ” Colloid – Mixture of a suspension and a solution Milk
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