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WHAT IS matter?
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How do you classify matter?
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MATTER Pure substances Mixtures
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A pure substance has a constant composition (one phase).
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A mixture has a variable composition (2 or more phases).
It is made of 2 or more pure substances which can be separated through physical changes : filtering, distillation, centrifugation, magnetism…..
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Which is the pure substance? Which is the mixture?
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Why does a chemist care?
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MATTER Pure substances Mixtures
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Pure substances Compounds Elements
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Pure Substances Cannot be separated by physical means: filtration, distillation, chromatography, mechanical extraction, settling, magnets
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Elements (on the periodic table)
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Compounds NaCl H2O (chemical formulas)
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How can we tell the difference between elements and compounds?
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Compounds can be broken down into simpler units by heat and/or electricity.
NaCl Na Cl
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Elements cannot be broken down chemically into simpler units by heat or electricity
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MATTER Pure substances Compounds Elements Mixtures
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Same properties throughout SOLUTIONS
Mixtures Homogeneous mixtures Heterogeneous mixtures Same properties throughout SOLUTIONS Different properties in small samples SALSA, MILK mechanical mixtures
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HETEROGENEOUS MIXTURES
MATTER PURE SUBSTANCES ELEMENTS COMPOUNDS MIXTURES HETEROGENEOUS MIXTURES HOMOGENEOUS MIXTURES
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TEST YOURSELF Pg. 13 # 1 a-c, #3 Vocab through homogeneous mixture LSM 1.2 Info: this powerpoint pg in your text.
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