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Chapter 2.1 & 2.2
      Claire W.
         8-4
Why does every sample of a given
     substance have the same
            properties?




a substance has a 鍖xed, uniform composition
Why does an element
    have a 鍖xed composition?


   an element
contains only one
  type of atom
What does a compound
  always contain?


               two or more
             elements joined
           in a 鍖xed proportion
Why can the properties
 of a mixture vary?




the composition of a mixture is not 鍖xed
Based on the size of its largest
  particles, how can a mixture be
             classi鍖ed?



                    suspension
colloid


                      solution
What are some examples
  of physical properties?
  malleability melting point   viscosity



conductivity



 hardness
                                 density
               boiling point
What are physical
   properties used for?
to separate the substances in a mixture



    to identify a material



to choose a material for a speci鍖c purpose
What are two common
separation methods?
 鍖ltration




             distillation
Filtration




 a process that separates
  materials based on the
  size of their particles
Distillation
 a process that separates the
  substances in a solution based on
  their boiling points
Evaporation

 a process
  that turns
  liquid into
  vapor
Under what conditions can
chemical properties be observed?

 only when
 the
 substances
 in a sample
 of matter
 are
 changing
 into
 different
 substances
What are three common types of
 evidence for a chemical change?




 change in color
 the production of gas
 the formation of a precipitate
How do chemical changes differ
    from physical changes?
 in a
  chemical
  change, the
  composition
  of the
  matter
  changes        in a physical change,
                  the composition of
                  the matter stays the
                  same
Test Question #1



What is a
suspension?
Test Question #2

What are two
differences between a
homogeneous and a
heterogeneous
mixture?
Test Question #3

What are three
common
separation
methods?
Test Question #4



What is a
suspension?
Test Question #5

Name four
examples of
physical
properties.
Test Question #6

What are three
common types of
evidence for a
chemical change?

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Chapter 2 Powerpoint

  • 1. Chapter 2.1 & 2.2 Claire W. 8-4
  • 2. Why does every sample of a given substance have the same properties? a substance has a 鍖xed, uniform composition
  • 3. Why does an element have a 鍖xed composition? an element contains only one type of atom
  • 4. What does a compound always contain? two or more elements joined in a 鍖xed proportion
  • 5. Why can the properties of a mixture vary? the composition of a mixture is not 鍖xed
  • 6. Based on the size of its largest particles, how can a mixture be classi鍖ed? suspension colloid solution
  • 7. What are some examples of physical properties? malleability melting point viscosity conductivity hardness density boiling point
  • 8. What are physical properties used for? to separate the substances in a mixture to identify a material to choose a material for a speci鍖c purpose
  • 9. What are two common separation methods? 鍖ltration distillation
  • 10. Filtration a process that separates materials based on the size of their particles
  • 11. Distillation a process that separates the substances in a solution based on their boiling points
  • 12. Evaporation a process that turns liquid into vapor
  • 13. Under what conditions can chemical properties be observed? only when the substances in a sample of matter are changing into different substances
  • 14. What are three common types of evidence for a chemical change? change in color the production of gas the formation of a precipitate
  • 15. How do chemical changes differ from physical changes? in a chemical change, the composition of the matter changes in a physical change, the composition of the matter stays the same
  • 16. Test Question #1 What is a suspension?
  • 17. Test Question #2 What are two differences between a homogeneous and a heterogeneous mixture?
  • 18. Test Question #3 What are three common separation methods?
  • 19. Test Question #4 What is a suspension?
  • 20. Test Question #5 Name four examples of physical properties.
  • 21. Test Question #6 What are three common types of evidence for a chemical change?

Editor's Notes