Elements, Mixtures and Compounds

1
Elements, Mixtures and Compounds
2
Element

• Substance that cant be broken down into another
  substance
• 89 Natural Elements
• 20 Man Made Elements
• 109 Total Elements

3
Element (cont.)

• Periodic Table
• Elements are listed on chart in order of
  their characteristics
• Chemical Symbol
• 1 or 2 letters that stand for an element
• Usually, but not always an abbreviation of the
  elements name

4
Examples of Chemical Symbols

• Oxygen O
• Helium He
• Gold Au
• Iron - Fe

5
Mixture

• Combination of 2 or more substances in which the
  substances keep their own properties
• Not combined chemically
• Doesnt have a definite amount of each ingredient

6
Mixture (cont.)

• Two types
• Homogenous mixture that is the same throughout
  (Examples Milk, Kool-Aid, pudding)
• Heterogeneous mixture that is not the same
  throughout (Examples raisin bran, choc. chip
  cookie dough)

7
Compound

• 2 or more elements that have been chemically
  combined
• Has new properties that are diff. from the
  properties of the elements its made of (new
  substance)
• Can be broken down by chemical means
• Has a definite amount of each element

8
Molecule

• Smallest part of a compound (cannot be any
  smaller unless it is broken apart into separate
  elements)

9
Chemical Formula

• Used to show what elements and how many make up a
  compound
• NaCl (sodium chloride) H2O (water)
• Sodium Chlorine 2 Hydrogens
  Oxygen

10
Game

• Split into groups of four
• With a piece of paper and a marker make four
  signs (Mixture, Compound, Heterogeneous,
  Homogeneous)
• Sit quietly and wait for next direction

11
Choices

• Element
• Compound
• Homogenous Mixture
• Heterogeneous Mixture