G. Mixtures Mixture Combination of 2 or more pure substances that are not chemically combined Substances are held together by physical forces, not chemical NO CHEMICAL CHANGE TAKES PLACE Each item retains its properties in the mixture They can be separated physically

Can be classified as: Heterogeneous mixture Homogeneous mixture G. Mixtures Cont. Can be classified as: Heterogeneous mixture Homogeneous mixture

H. Heterogeneous v. Homogeneous Heterogeneous Mixture A mixture that does not blend smoothly throughout Example: Sand mixed with water, soup Homogeneous Mixture A mixture that has constant composition throughout Homogeneous mixture = SOLUTION Salt dissolved in water, Gatorade

Homogeneous or heterogeneous mixture? Check Homogeneous or heterogeneous mixture? Vinegar Iron filings in sand Chicken noodle soup Muddy water

I. Elements v. Compounds Element List 5 elements that you recognize A pure substance that cannot be separated into a simpler substance by physical or chemical means. List 5 elements that you recognize

I. Elements v. Compounds Cont. Combination of two or more different elements that are combined chemically Made of elements in a specific ratio that is always the same Has a chemical formula Can only be separated by chemical means, not physically H2O NaCl CO2

Element or Compound? Neon (Ne) Water (H2O) Salt (NaCl) Check Element or Compound? Neon (Ne) Water (H2O) Salt (NaCl) Carbon Dioxide (CO2) Sulfur (S)

CLASSIFICATION OF MATTER changes changes

CLASSIFICATION OF MATTER Pure Substances Physical changes Mixtures Chemical Heterogeneous mixtures Homogeneous mixtures Elements changes Compounds