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Classifying Matter: Elements, Compounds, and Mixtures

Classifying Matter: Elements, Compounds, and Mixtures. 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 substance by physical or chemical means.

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Classifying Matter: Elements, Compounds, and Mixtures

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  1. Classifying Matter:Elements, Compounds, and Mixtures

  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 substance 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. 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

  6. Types of Mixtures • Homogeneous – Molecules are mixed up in an even distribution • Ex: sugar water, lemonade, Kool-Aid , soda, air • Solutions: a mixture that appears to be a single substance • Solute + Solvent = Solution • Heterogeneous- Molecules are not mixed up in an even distribution • Ex: snow globe, sand in a bucket of water, muddy water • Suspensions – a mixture in which particles are dispersed in a liquid or gas and will eventually settle out

  7. Mixtures vs. Compounds http://www.bbc.co.uk/schools/ks3bitesize/science/chemistry/elements_com_mix_6.shtml

  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. Element, Compound, or Mixture? Rocks

  10. Element, Compound, or Mixture? Rocks

  11. Element, Compound, or Mixture? Copper

  12. Element, Compound, or Mixture? Copper Cu

  13. Element, Compound, or Mixture? Jelly Beans

  14. Element, Compound, or Mixture? Jelly Beans

  15. Element, Compound, or Mixture? Table Sugar

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

  17. Element, Compound, or Mixture? Diamond

  18. Element, Compound, or Mixture? Diamond C

  19. Element, Compound, or Mixture? Tea

  20. Element, Compound, or Mixture? Tea

  21. Element, Compound, or Mixture? Salt

  22. Element, Compound, or Mixture? NaCl Salt

  23. Element, Compound, or Mixture? Neon Gas

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

  25. Element, Compound, or Mixture? Salad

  26. Element, Compound, or Mixture? Salad

  27. Element, Compound, or Mixture? Pure Water

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

  29. Element, Compound, or Mixture? Aluminum

  30. Element, Compound, or Mixture? Aluminum Al

  31. Element, Compound, or Mixture? Lemonade

  32. Element, Compound, or Mixture? Lemonade

  33. Element, Compound, or Mixture? Silver

  34. Element, Compound, or Mixture? Silver Ag

  35. Element, Compound, or Mixture? Sand

  36. Element, Compound, or Mixture? Sand

  37. Notes • Detailed notes are located at: http://www.middleschoolscience.com/elements-compounds-mixtures-notes-isn.pdf • Flow Chart: http://www.middleschoolscience.com/matter-flow-chart-isn.pdf

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