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Why Does Matter Matter?

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Why Does Matter Matter? TEKS 4 (A) differentiate between physical and chemical changes and properties; 4 (B) identify extensive and intensive properties; 4 (D ... – PowerPoint PPT presentation

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Title: Why Does Matter Matter?


1
Why Does Matter Matter?
2
TEKS
  • 4 (A) differentiate between physical and chemical
    changes and properties
  • 4 (B) identify extensive and intensive
    properties
  • 4 (D) classify matter as pure substances or
    mixtures through investigation of their
    properties.

3
Physical vs. Chemical Changes
  • Examples
  • rusting iron
  • dissolving in water
  • burning a log
  • melting ice
  • grinding spices
  • Chemical
  • Physical
  • Chemical
  • Physical
  • Physical

4
Sure Signs of a Chemical Change
  • Energy Change (Temperature and Light)
  • Gas Produced (not from boiling!)
  • Precipitate a solid formed by mixing two
    liquids together
  • Color Change (Be Careful)

http//jchemed.chem.wisc.edu/JCESoft/CCA/CCA0/MOVI
ES/S1047.MOV
5
Physical Changes
  • can be observed without changing the identity of
    the substance
  • Some physical changes would be
  • Phase Change
  • boiling of a liquid
  • melting of a solid
  • dissolving a solid in a liquid to give a
    homogeneous mixture a SOLUTION.

6
Changes Quiz
  • Are the following changes considered chemical or
    physical?
  • 1. Sharpening a pencil
  • 2. Dissolving Koolaid in water
  • 3. Silver Tarnishing
  • 4. Alcohol evaporating
  • 5. Milk souring

7
Chemical Properties and Chemical Change
  • Burning hydrogen (H2) in oxygen (O2) gives H2O.

8
Chemical Properties and Chemical Change
  • Burning hydrogen (H2) in oxygen (O2) gives H2O.
  • Chemical change or chemical reaction
    transformation of one or more atoms or molecules
    into one or more different molecules.

9
Physical Properties ( see STAAR field guide)
  • What are some physical properties?
  • color
  • melting and boiling point
  • odor

10
  • Graphite layer structure of carbon atoms
    reflects physical properties.

11
Physical vs. Chemical Properties
  • physical
  • chemical
  • physical
  • physical
  • chemical
  • Examples
  • melting point
  • flammable
  • density
  • magnetic
  • tarnishes in air

12
Physical Chemical Properties quiz
Chemical Physical Physical Physical Physical Chemi
cal Physical Chemical
  • Combustible
  • Hard
  • 13 Kilograms
  • Boils at 200C
  • Density of 6.1g/cm³
  • Corrodes in air
  • Soluble in water
  • Volatile in water

13
What are Extensive and Intensive Properties?
  • All Physical Properties of Matter can be
    classified as Extensive or Intensive.
  • Extensive Properties- depend on the amount of
    matter
  • Ex) Mass
  • Intensive Properties- DOES NOT depend on the
    amount of matter.
  • Ex) luster, density (Mass/Volume ratio)
  • Determine Extensive or Intensive from the
    Physical properties on slide 9.

14
Intensive/Extensive Properties Quiz
  • Hard
  • 13 Kilograms
  • Boils at 200C
  • Density of 6.1g/cm³
  • Corrodes in air
  • Soluble in water

15
Mixtures and Pure Substances Matter can be
classified as a mixture or a pure substance.
16
Mixtures
  • A mixture has variable composition
  • A homogeneous mixture has the same properties
    throughout.
  • A heterogeneous mixture has different properties
    in different parts of the mixture.

17
Separation of Mixtures
  • distillation

filtration
18
Separation of Mixtures
  • Decantation- is a process of carefully pouring a
    solution from a container in order to leave the
    precipitate (sediments) in the bottom of the
    original container.

Chromatography- involves passing a mixture
dissolved in a "mobile phase" through a
stationary phase. Chromatography works on the
principle that different compounds will have
different solubilities and adsorption to the two
phases, which will allow for their separation.
19
Pure Substances
  • A pure substance always has the same composition.
  • Pure substances are of two types
  • Elements which cannot be broken down chemically
    into simpler substances
  • Compounds which can be chemically broken down
    into elements

Water is a compound. All the components are the
sameH2O molecules.
20
Matter Flowchart
21
Types of Mixtures
  • Variable combination of 2 or more pure substances.

Heterogeneous visibly separate phases
Homogeneous Same throughout
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