Pure Substances Every sample of a given substance has the same properties because a substance has a fixed, uniform composi...
Elements and Compounds An element has a fixed composition because it contains only one type of atom.          One capital ...
The properties of a                               mixture can varyMixtures                       because the              ...
Colloids                                              Suspensions,                                              Solutions,...
Colloids                                                     Suspensions,                                                 ...
Colloids                                              Suspensions,                                              Solutions,...
Lava with high                                            Lava with lowviscosity                                          ...
Separation techniques Distillation       A process that separates a solution based on boiling       points
Separation techniques Filtration       A process that separates materials based on the size of       their particles and/o...
Separation techniques Evaporation      A process used to isolate a solid dissolved in a liquid,      Property: solubility
Flammability Flammability is a material’s ability to burn in the presence of oxygen. The ability to burn is not a physical...
Reactivity  Reactivity is the property thatdescribes how readily a substancecombines chemically with othersubstances.
Chemical and PhysicalChanges
Precipitates Any solid that forms and separates from a liquid mixture is called a precipitate.
Review Question One
Review Question Two
Review Question Three
Review Question Four
Review Question Five
Science Chapter Two
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Science Chapter Two

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Science Chapter Two

  1. 1. Pure Substances Every sample of a given substance has the same properties because a substance has a fixed, uniform composition.
  2. 2. Elements and Compounds An element has a fixed composition because it contains only one type of atom. One capital letter A compound always contains two to more elements joined in a fixed proportion. More than one capital letter
  3. 3. The properties of a mixture can varyMixtures because the composition of a mixture is not fixed. Heterogeneous Homogeneous Comes from the Greek One mixture so thoroughly words: dissolved in another mixture that it is hard to distinguish between the two Hetero: Different: in the mixture. Geneous: Kind Ex: salt water.
  4. 4. Colloids Suspensions, Solutions,Based on the size of its largestparticles, a mixture can be classified as asolution, a suspension, or a colloid. Solution A homogeneous mixture that does not separate into layers over time Can be seen through Must be separated chemically
  5. 5. Colloids Suspensions, Solutions,Based on the size of its largestparticles, a mixture can be classified as asolution, a suspension, or a colloid. Suspension A heterogeneous mixture that separates into layers Can be separated physically
  6. 6. Colloids Suspensions, Solutions,Based on the size of its largest particles,a mixture can be classified as a solution,a suspension, or a colloid. Colloid Particles in between solutions and suspensions. Do not separate into layers Cannot be separated by a filter
  7. 7. Lava with high Lava with lowviscosity viscosity Viscosity • The thickness of a liquid • The higher viscosity, the thicker the liquid.
  8. 8. Separation techniques Distillation A process that separates a solution based on boiling points
  9. 9. Separation techniques Filtration A process that separates materials based on the size of their particles and/or solubility.
  10. 10. Separation techniques Evaporation A process used to isolate a solid dissolved in a liquid, Property: solubility
  11. 11. Flammability Flammability is a material’s ability to burn in the presence of oxygen. The ability to burn is not a physical property because you cannot observe burning without changing the composition of the of the material that is burning.
  12. 12. Reactivity Reactivity is the property thatdescribes how readily a substancecombines chemically with othersubstances.
  13. 13. Chemical and PhysicalChanges
  14. 14. Precipitates Any solid that forms and separates from a liquid mixture is called a precipitate.
  15. 15. Review Question One
  16. 16. Review Question Two
  17. 17. Review Question Three
  18. 18. Review Question Four
  19. 19. Review Question Five

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