Chemistry--Matter by u4pg9WmF

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									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
           Solutions
One substance dissolved into another
(usually H2O)

            solute: what is dissolved
            solvent: what it’s dissolved in


                 solute


                     solvent
               Solutions
Properties
  • Cannot see the individual parts
  • Transparent
  • Uniform, but variable composition
                                      “aqueous”—
Examples                              dissolved in
                                      water
  • Soda, air, Kool-aid, CuSO4 (aq)
             Substances
• PURE!!!
• Made up of only one thing

              Two types:
              1) Element
              2) Compound
                   Elements
• Made up of only ONE type of atom
• Have Constant Composition
• Can be found on the Periodic Table   Cu atoms


Ex: Fe, Cu, H2, O2, S8
diatomic
molecules
                Compounds
• Two or more different types of atoms
  bonded together
 Ex: H2O, NaHCO3, NaCl, C12H22O11




                                     caffeine
                     Molecules
Two or more same OR different atoms bonded together

 Ex: O2, H2, S8, H2O, CO2


                     molecule         compound
     element

       Fe       O2              CO2
       Cu       H2              H2O
                            Matter



                 Homogeneous       Heterogeneous


                                     Mixture

            Substance   Solution


Element          Molecule

          Compound
       Intensive Properties
IN the substance
does not depend on amount of substance

Ex: density, color, conductivity,
    boiling point, melting point,
    ductility, malleability, temperature
        Extensive Properties
depends on the amount of substance

 Ex: volume, mass, length
           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)




              +
        Chemical Properties
The ability to undergo a
  chemical reaction and
  create new substance(s)

Demonstrations:
           Chemical Changes
Evidence
    be specific!

1)   Change in energy (i.e. heat given off)
2)   Formation of a precipitate (solid)
3)   Unpredictable color change
4)   Production of a gas (bubbles, fizz)
5)   Change in mass
6)   Change in solubility
                            Quiz 
Element, Compound, Solution, or Mixture?
              M
   1. Soap ____                       E
                              6. Au _____
             C
   2. CO2 ____                             C
                              7. AgNO3 _____
                  S
   3. NaCl (aq) _____                         S
                              8. AgNO3 (aq) _____
              M
   4. Sand _____                      S
                              9. Air ______
                   M
   5. An orange _____                    M
                              10. Milk _____


Extensive or Intensive Property?
11. density _____
              I         14. 25 g _____
                                   E                              I
                                               17. boiling point _____
           I
12. color _____                         I
                        15. solubility _____                  I
                                               18. ductility _____
                   I             E
13. malleability _____ 16. 5 m _____                          E
                                               19. 545 ml _____

								
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