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Elements, Compounds, and Mixtures Notes

Elements, Compounds, and Mixtures Notes. Pure Substances. A sample of matter that has definite chemical and physical properties. Atoms. Elements. Compounds. Molecules. Elements. pure substance that cannot be separated into simpler substances by physical or chemical means. Compounds.

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Elements, Compounds, and Mixtures Notes

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  1. Elements, Compounds, and Mixtures Notes

  2. Pure Substances • A sample of matter that has definite chemical and physical properties. Atoms Elements Compounds Molecules

  3. Elements • pure substance that cannot be separated into simpler substances by physical or chemical means.

  4. Compounds Pure substance composed of two or more different elements joined by chemical bonds. • 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

  5. Common Compounds You Should Know… **wink, wink** • Table Salt  NaCl (sodium chloride) • Chalk  CaCO3 (calcium carbonate) • Rust  FeO (iron oxide) • Carbon Dioxide  CO2

  6. Mixtures • A combination of two or more pure substances that are not chemically combined. • substances 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 Chem4kids.com

  7. Classification of Mixtures • Two groups: • Heterogeneous mixtures - substances that are not distributed evenly throughout the mixture; you can see the different parts • Examples: chicken noodle soup, oil and water, orange juice with pulp and ice cubes • Homogeneous mixtures (ALSO KNOWN AS SOLUTIONS) - substances that are evenly distributed throughout the mixture; you canNOT see the different parts • Examples: blood, coffee, pulp-free orange juice, salt water

  8. Can you identify the following? You will be shown a series of photos. Tell if each photo represents an item composed of an element, compound, or mixture. Review: • An element contains just one type of atom. • A compound contains two or more different atoms joined together. • A mixture contains two or more different substances that are only physically joined together, not chemically. • A mixture can contain both elements and compounds.

  9. A = Element B = Compound C = Mixture Element, Compound, or Mixture? Rocks

  10. A = Element B = Compound C = Mixture Element, Compound, or Mixture? Copper

  11. A = Element B = Compound C = Mixture Element, Compound, or Mixture? Jelly Beans

  12. A = Element B = Compound C = Mixture Element, Compound, or Mixture? Table Sugar

  13. A = Element B = Compound C = Mixture Element, Compound, or Mixture? Tea

  14. A = Element B = Compound C = Mixture Element, Compound, or Mixture? Salt

  15. A = Element B = Compound C = Mixture Element, Compound, or Mixture? Neon Gas

  16. A = Element B = Compound C = Mixture Element, Compound, or Mixture? Salad

  17. A = Element B = Compound C = Mixture Element, Compound, or Mixture? Pure Water

  18. A = Element B = Compound C = Mixture Element, Compound, or Mixture? Aluminum

  19. A = Element B = Compound C = Mixture Element, Compound, or Mixture? Lemonade

  20. A = Element B = Compound C = Mixture Element, Compound, or Mixture? Silver

  21. A = Element B = Compound C = Mixture Element, Compound, or Mixture? Sand

  22. Element, Compound, or Mixture? Rocks

  23. Element, Compound, or Mixture? Copper Cu

  24. Element, Compound, or Mixture? Jelly Beans

  25. Element, Compound, or Mixture? Table Sugar C12H22O11

  26. Element, Compound, or Mixture? Tea

  27. Element, Compound, or Mixture? NaCl Salt

  28. Element, Compound, or Mixture? Ne Neon Gas

  29. Element, Compound, or Mixture? Salad

  30. Element, Compound, or Mixture? Pure Water H2O

  31. Element, Compound, or Mixture? Aluminum Al

  32. Element, Compound, or Mixture? Lemonade

  33. Element, Compound, or Mixture? Silver Ag

  34. Element, Compound, or Mixture? Sand

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