Ch' 2 Properties of Matter

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Ch. 2 Properties of Matter

• 2.1 Classifying Matter
• Matter Flowchart
• Pure Substances
• Mixtures

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A. Matter Flowchart
MATTER
yes
no
Can it be physically separated?
Homogeneous Mixture (solution)
Heterogeneous Mixture
Compound
Element
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A. Matter Flowchart

• Examples
• graphite
• pepper
• sugar (sucrose)
• milk
• soda

• element
• hetero. mixture
• compound
• colloid
• solution

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B. Pure Substances

• Element
• composed of identical atoms
• Ex copper wire, aluminum foil

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B. Pure Substances

• Compound
• composed of 2 or more elements in a fixed ratio
• properties differ from those of individual
  elements
• Ex table salt (NaCl)
• Ex water (H2O)

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B. Pure Substances

• Law of Definite Composition
• A given compound always contains the same, fixed
  ratio of elements. Water is always 2 parts
  hydrogen and one part oxygen.
• Law of Multiple Proportions
• Elements can combine in different ratios to form
  different compounds. Water (H2O) is very
  different than hydrogen peroxide (H2O2).

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B. Pure Substances

• For example

Two different compounds, each has a definite
composition.
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C. Mixtures

• Variable combination of 2 or more pure substances.

Heterogeneous
Homogeneous
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C. Mixtures

• Solution
• homogeneous
• very small particles
• no Tyndall effect

• particles dont settle
• Ex rubbing alcohol

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C. Mixtures

• Colloid
• Borderline mixture
• medium-sized particles
• Tyndall effect
• particles dont settle
• Ex milk

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C. Mixtures

• Suspension
• heterogeneous
• large particles
• Tyndall effect
• particles settle
• Ex fresh-squeezed lemonade

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C. Mixtures

• Examples
• mayonnaise
• muddy water
• fog
• saltwater
• Italian salad dressing

• colloid
• suspension
• colloid
• solution
• suspension