mixtures notes and pre lab

							MIXTURES AND SOLUTIONS
Chemistry in the Community
September 21, 24, 25, 2012
FRIDAY, SEPTEMBER 21
Please get your book.
DMA: If you could classify all matter into two
  categories, what would they be?
TODAY
Finish Water Diary Questions
Matter Concept Map
w/Mixtures Reading pp. 23-24
DMA: 1ST PERIOD
• Living, non-living

• Pure substances or mixtures
• Young and Old (Old and New)
• Neutral or charged
DMA: 2ND PERIOD
• Living and non-living (unicellular or multicellular)
• Visible with the human eye or not visible
• Mixtures and pure substances
• Solid or not (liquid, gas, plasma)
• Old and young (old and new)
DMA 1ST PERIOD
• Pure matter and not pure
• Small or large
• Living and non-living
• Solid and liquid or gas or plasma
DMA: 2ND PERIOD
• Elements and combinations of atoms
• Living and non-living
• Liquids (at room temp) and non-liquids
• Organic and inorganic
TOPIC AGENDA
• Matter Concept Map
• Read B2 Mixtures and Solutions pp. 23-24
   Find the bold words in the text and add their
  definitions to your concept map.
• Pre-lab: Purpose & Data table
• B3 Mixtures Lab
• Mixtures Quiz next week
MIXTURES AND SOLUTIONS OBJECTIVES
• Describe the difference between a mixture and a compound.
  One involves physical mixing of compounds and one involves chemical
  bonding of atoms to form molecules.
• Know the difference between a homogeneous and a
  heterogeneous mixture.
• Identify the solvent and the solute in a solution.
• Explain the differences between a solution, a suspension, and a
  colloid.
SUBSTANCES
• Made of atoms bonded together that cannot be
  separated with physical processes.
• A substance is either an:
   –Elements: made of only one type of atom
   • Ex: Gold, Iron
   –Compounds: made from atoms of two or more
     elements combined
      • Ex: Water
MIXTURES
• Material made up of two or more substances that
  combine and retain their individual properties.
  –Salad
  –Salad dressing
  –Foul water
TYPES OF MIXTURES
• Heterogeneous: mixture that is not evenly mixed.
  –Ex: Snickers
• Homogeneous: mixture where two or more
  substances are uniformly spread out
    Ex: Hershey’s Bar
MONDAY, SEPTEMBER 24
• Please get your textbook.


• Pp. 23-24


• DMA: Please find the definition for solution and add it
  to your Matter Concept Map.
SOLUTIONS
• Homogeneous mixture which remains
  uniformly mixed
   –Ex: salt water, gatorade
COLLOIDS
• Heterogeneous mixture that never settles
  and scatters light particles
   –Ex: Milk, gelatin
SUSPENSIONS
• Heterogeneous mixture where the particles
  settle out.
  –Ex: muddy water, salad dressing
PRE-LAB: MIXTURES
• On p. 25, read the “Getting Ready” paragraph.
• Write a purpose statement.
• Write a methods summary for the lab in 2-3
  sentences. Include what the basic steps are.
• Copy the first data table: “original sample”.
  Make it large enough to fill out.
SAFETY AND PROCEDURE
• Do not point lasers at anyone or anything except the beakers.


• Lights are off, so walk slowly.


• When you finish, please bring all beakers to the front
  counter.
TYNDALL EFFECT
• Used to test for the presence of colloidal particles.
• Colloidal particles reflect light so you can see the
  light clearly in the liquid.
• If the light shines through the mixture and YOU CAN
  SEE A BRIGHT BEAM IN THE LIQUID the Tyndall Effect
  HAS happened, so you would fill in “YES” in your
  table.
• Compare the brightness of the beam to plain water.
DMA: TUESDAY, SEPTEMBER 25
• Please get your textbook.
• Please rank these mixtures by their particle size from
  largest to smallest:
• Solutions
• Suspensions
• Colloids                       suspensions
                                 colloids
                                 solutions
MIXTURES LAB RESULTS HINTS
• 2 are solutions
• 1 is a colloid
• 1 is both a colloid and a suspension


• Tyndall effect is only seen in 2 mixtures.
DEMONSTRATION: FILTRATION OF 4 MIXTURES
• Which mixture(s) do you think contain particles that may be
  removed by the filter?




• Particles should only be VISIBLY filtered out of 1 mixture.
NOTEBOOK CHECK
• Foul Water Lab (20 points; calculations/questions 10 points)
• Water Diary (20 points: 10 for data, 10 for calculations)
• Water Properties Notes/exit task (15 points: 10 notes, 5 exit
  task)
• Water Properties Lab (8 lab points)
• FLOW video questions (8 points)
MIXTURES VIDEOS
• Khan Academy: Solutions Colloids Suspensions (10:30 of 13:47)