Chapter 22 - Mixtures
Key Terms:
| concentration | dissolving | heterogeneous mixture |
| homogeneous mixture | impure | mixture |
| molarity | mole | pure |
| saturated solution | solute | solution |
| solvent | suspension | unsaturated solution |
Objectives of chapter:
Outline:
22.1 Most materials are mixtures
a mixture is ___________
Mixtures are common in our everyday livesMixtures come in many forms
examples:
22.2 Mixtures can be separated by means of physical properties
distillation
filtration
22.3 Pure or Impure? what does it mean?
Types of mixtures:
Heterogeneous
Definition: Heterogeneous mixtures have particles that may be unevenly sized or not evenly distributed. Heterogeneous mixtures exhibit the Tyndall effect in bright light.
Examples:
colloids / emulsions - do NOT settle out
- milk
- smoke / smog
- fog
- whipped cream
suspension - will settle out
- muddy water
- salad dressing
22.4 What is a solution?
Homogeneous
Definition: Homogeneous mixtures are evenly mixed and the particles are spread out.
Solutions have a solvent and solute -- the solvent is the greater of the two and does the "dissolving"
Examples:
- Solid: Solid - Alloys
- Gas : Liquid - carbonated beverages
- Solid : Liquid - salt water
- Liquid : Liquid - orange juice
- Gas : Gas - air
saturated vs. unsaturated solutions
concentration
what then is a mole of something?
what is ... a few? a couple? a dozen?
Chapter links
www.sugar.org/scoop/refine.html
Chem4Kids! Your Chemistry Website - mixtures section
Related labs, activities and videos
crime lab - using chromatography to separate a mixture
sugar soft - measure the sugar content of commercial soft drinks
salt, sugar and sand - use image processing to analysis a mixture
Practice Book Exercises
pure mathematics - what does it mean to be pure? page 85
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