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Mixtures

Mixtures. Classifying Matter Separating Mixtures. I. Classifying Matter. Substance – a material made of only one type of molecule Water is a substance when there are no impurities Substances are always pure There are two types of substances

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Mixtures

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  1. Mixtures Classifying Matter Separating Mixtures

  2. I. Classifying Matter • Substance – a material made of only one type of molecule • Water is a substance when there are no impurities • Substances are always pure • There are two types of substances • Elements – when only one element is present you have a substance • Compounds – two or more elements bound together • Water is a compound made of hydrogen and oxygen bound together • If the atoms are bound together strongly, we call it a molecule, if not it is just called a compound • Mixture – A combination of two or more substances • Pepsi is a mixture of sugar, water, carbon dioxide, and other ingredients • Mixtures do not have to be liquids, dry cement is a mixture

  3. I. Classifying Matter • Two types of mixtures • Heterogeneous mixture – the substances are not mixed evenly • Samples taken at different locations will have different amounts and/or types of molecules • Ex: Chili, raisin bran, granite, etc. • Homogeneous mixture – each type of molecule present is even distributed throughout the mixture • A sample anywhere in the mixture will have the same composition • Solution – another name for a liquid homogenous mixture

  4. Comprehension Check • Classify each of the following as homogeneous or heterogeneous. • Sea water • Your desktop • Lucky Charms • I-pod • Kool-Aid • Water • Tomato soup • Calm chowder homogeneous homogeneous heterogeneous heterogeneous homogeneous Not a Mixture homogeneous heterogeneous

  5. Comprehension Check Draw the diagram below and fill in the empty boxes with a heading and description

  6. III. Separating Mixtures • Filtration – uses a filter to remove pieces of a solid from a liquid • Distillation – if two liquids are that are mixed have different boiling points, the mixture can be heated slowly. The liquid with the lowest boiling point will evaporate faster and boil sooner. • You cannot completely separate the substances using distillation because some of the other liquid will also evaporate during the process • Evaporation – to remove a dissolved solid, the liquid can be evaporated

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