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Transcript

  • 1. Science Powerpoint Madeleine Dodge
  • 2. MATTER
  • 3. Scientists classify things by theircompositionMixtures, elements, compounds
  • 4. How to classify???? Can separate physically? = MixtureCan separate chemically? = Pure Substance
  • 5. Mixturest wo or more substancesnot chemically combinedretain characteristic properties
  • 6. Types of Mixtures:HomogeneousHeterogenous
  • 7. Homogenousappears the same throughout“well mixed”the particles that make up the mixtureare very small and hard to recognize
  • 8. Heterogenousdoes not appear the same throughoutthe particles in the mixture are largeenough to be seen and separated fromthe mixtureno specific proportion
  • 9. Types of Pure SubstancesCompoundsElements
  • 10. Elementsmade of atomsatoms in the same elements are alikeatoms in different elements are not
  • 11. Compoundsmade from more than one elementcan be broken down into simplersubstances
  • 12. SEPARATIONTECHNIQUES
  • 13. Distillationa process that separates the substancesin a solution based on their boilingpoints
  • 14. #1 B U #2 F Ftemp (c˚) E R plateau plateau time (mins)
  • 15. Filtrationa process that separates materialsbased on the size of particles and/orsolubility
  • 16. solid isolatedfunnel w/ filter paper filtrate
  • 17. Evaporationa process used to isolate a solid dissolvedin a liquid property: solubility
  • 18. NaCl: sodium chloride water
  • 19. CHEMICALPROPERTIES
  • 20. What is a chemical property?
  • 21. Any ability to produce a change in thecomposition of matterChemical properties can be obser vedonly when the substances in a sample ormatter are changing into differentsubstances.
  • 22. Flammabilitya material’s ability to burn in thepresence of oxygen.
  • 23. Flammabilitya material’s ability to burn in thepresence of oxygen.
  • 24. Flammabilitya material’s ability to burn in thepresence of oxygen.
  • 25. Flammabilitya material’s ability to burn in thepresence of oxygen.
  • 26. Reactivityhow readily a substance combineschemically with other substances
  • 27. What is a chemical change?
  • 28. when a substance reacts and forms oneor more new substanceschange in colorproduction of a gasformation of a precipitatechange in temperature
  • 29. Review Questions
  • 30. How could you use physical properties to separate mixtures?
  • 31. What is are the differences bet ween a solution, suspension, and colloid?
  • 32. What is a physical property?
  • 33. What is an example of a chemicalseparation technique that we talked about?
  • 34. What is a chemical change?