CHEM 112-113 Lecture Notes - Lecture 1: Lemonade, Chemical Formula, Kilogram

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Matter - anything that has mass and takes up space. Can be a pure substance or a mixture. A pure substance is anything that can be written as a chemical formula, has a definite composition with exact ratios, and can be elements or compounds. Pure substances include o2, h2o, c6h12o6, fe, and co2. A mixture is anything that cannot be written as a formula because it does not have definite ratios, and mixtures can be heterogeneous or homogeneous. A homogeneous mixture is a mixture that has the same amounts of substances evenly throughout the entire mixture. This can also be called a solution and is made up of either liquids or gases. Examples of homogenous mixtures include salt water solutions, air, and lemonade. A heterogeneous mixture is a mixture that does not have the same amounts of substances evenly throughout the mixture. These mixtures are made up of solids or solids mixed with liquids.

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