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Ch. 2 - Classification of Matter

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I. Describing Matter ... density B. Physical Change A change in the form of a substance without changing its identity. properties ... particles scatter light ... – PowerPoint PPT presentation

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Title: Ch. 2 - Classification of Matter


1
Ch. 2 - Classification of Matter
MATTER
  • I. Describing Matter
  • Physical Property
  • Physical Change
  • Chemical Change
  • Chemical Property

2
A. Physical Property
  • A characteristic of a substance that can be
    observed without changing its identity.
  • can be used to separate mixtures
  • EX magnetism, density

3
B. Physical Change
  • A change in the form of a substance without
    changing its identity.
  • properties remain the same
  • reversible
  • can be used to separate mixtures
  • EX dissolving, grinding

4
C. Chemical Change
  • A change in the identity of a substance.
  • properties change
  • irreversible
  • Signs color change, formation of a gas/solid,
    release of light/heat
  • EX burning, rusting

5
D. Chemical Property
  • A characteristic that indicates whether a
    substance can undergo a specific chemical change.
  • EX flammability, reactivity

6
Ch. 2 - Classification of Matter
MATTER
  • II. Composition of Matter
  • Matter Flowchart
  • Pure Substances
  • Mixtures

7
A. Matter Flowchart
MATTER
yes
no
Can it be separated by physical means?
Homogeneous Mixture (solution)
Heterogeneous Mixture
Compound
Element
8
B. Pure Substances
  • Element
  • matter composed of identical atoms
  • EX copper

9
B. Pure Substances
  • Compound
  • matter composed of 2 or more elements in a fixed
    ratio
  • properties differ from those of individual
    elements
  • EX salt (NaCl)

10
C. Mixtures
  • Variable combination of 2 or more pure substances.
  • Homogeneous Mixture (Solution)
  • even distribution of components
  • very small particles
  • particles never settle
  • EX saline solution

11
C. Mixtures
  • Heterogeneous Mixture
  • uneven distribution of components
  • colloids and suspensions
  • EX granite

12
C. Mixtures
  • Colloid
  • medium-sized particles
  • Tyndall effect - particles scatter light (looks
    cloudy)
  • particles never settle
  • EX milk

13
C. Mixtures
  • Suspension
  • large particles
  • particles scatter light
  • particles will settle (needs to be shaken)
  • EX fresh-squeezed lemonade
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