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Chemistry—Matter

Chemistry—Matter. Unit 2. Heterogeneous Matter. Non-uniform composition Chunky “shake before use” Comes from a living thing. Ex: peanut butter, shaving cream, blood. Homogeneous Matter. Uniform Composition Two Types: 1) Solution 2) Substance. solute. solvent. Solutions.

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Chemistry—Matter

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  1. Chemistry—Matter Unit 2

  2. Heterogeneous Matter • Non-uniform composition • Chunky • “shake before use” • Comes from a living thing Ex: peanut butter, shaving cream, blood

  3. Homogeneous Matter Uniform Composition Two Types: 1) Solution 2) Substance

  4. solute solvent Solutions • One substance dissolved into another (usually H2O) • solute: what is dissolved • solvent: what it’s dissolved in

  5. “aqueous”— dissolved in water Solutions Properties • Cannot see the individual parts • Transparent • Uniform, but variable composition Examples • Soda, air, Kool-aid, CuSO4 (aq)

  6. Substances • PURE!!! • Made up of only one thing Two types: 1) Element 2) Compound

  7. diatomic molecules Elements • Made up of only ONE type of atom • Have Constant Composition • Can be found on the Periodic Table Ex: Fe, Cu, H2, O2, S8 Cu atoms

  8. Ex: H2O, NaHCO3, NaCl, C12H22O11 caffeine Compounds • Two or more different types of atoms bonded together

  9. molecule compound element O2 H2 CO2 H2O Fe Cu Molecules Two or more same OR different atoms bonded together Ex: O2, H2, S8, H2O, CO2

  10. Matter Homogeneous Heterogeneous Substance Solution Molecule Element Compound Mixture

  11. Intensive Properties IN the substance does not depend on amount of substance Ex: density, color, conductivity, boiling point, melting point, ductility, malleability, temperature

  12. Extensive Properties depends on the amount of substance Ex: volume, mass, length

  13. + Physical Changes No new substance is formed Change in size, shape, state of matter, dissolving Ex: melting, boiling, ripping, predictable color change H2O (s)  H2O(g)

  14. Chemical Properties The ability to undergo a chemical reaction and create new substance(s) Demonstrations:

  15. Chemical Changes Evidence be specific! • Change in energy (i.e. heat given off) • Formation of a precipitate (solid) • Unpredictable color change • Production of a gas (bubbles, fizz) • Change in mass • Change in solubility

  16. Quiz  Element, Compound, Solution, or Mixture? • Soap ____ 6. Au _____ • CO2 ____ 7. AgNO3 _____ • NaCl (aq) _____ 8. AgNO3 (aq) _____ • Sand _____ 9. Air ______ • An orange _____ 10. Milk _____ Extensive or Intensive Property? 11. density _____ 14. 25 g _____ 17. boiling point _____ 12. color _____ 15. solubility _____ 18. ductility _____ 13. malleability _____ 16. 5 m _____ 19. 545 ml _____ M E C C S S S M M M I I E I I I I E E

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