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2013-01-27 19:24:35

lecture 2
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  1. List  qualifications for purse substances
    • single chemical
    • one kind of matter
    • has one definite composition
    • has definite properties
  2. List the qualifications for mixtures
    • two or more chemicals
    • many compositions possible (variable)
    • properties depend of composition
    • can be separated by physical means (running a current through)
  3. What are the two types of matter?
    pure substances and mixtures
  4. What are the two types of mixtures?
    Homogeneous and heterogeneous
  5. What are the two types of pure substances?
    Elements and compound.
  6. List the qualifications for homogeneous mixtures.
    • uniform composition
    • uniform appearance
    • solution
  7. What does the prefix "homo" mean?
  8. What does the prefix "hetero" mean?
  9. What are the qualifications for heterogeneous mixtures?
    • non uniform composition
    • non uniform appearance
    • distinct parts (phases)
  10. List the qualifications for elements.
    • cannot be separated or decomposed into other purse substances
    • contains 1 type of atom
  11. List the qualifications for compounds.
    • can be separated into other purse substances
    • contains 2 or more kinds of atom
  12. List the qualifications for physical properties.
    • Characterize physical states of behavior of something
    • description by senses (color, shape, odor)
    • measurable (mp, bp, density)
  13. List the qualifications for chemical properties.
    • describe the ability of a substance to change into a new substance
    • list of chemical changes possible
    • "may react to form.."
  14. List the qualifications for physical changes.
    • changes of state, but substance remains the same.
    • New form of old substance
    • no new substance
  15. What's the difference between chemical change and property?
    a chemical property is the potential for a chemical change, a chemical change is when a substance already changed.
  16. A pure substance..
    can never be separated into parts by physical means
  17. What is the standard symbol for liter?
  18. Chemistry is the study of..
    matter and its changes from one substance to another.
  19. A compound..
    can always be broken down chemically into simpler components.
  20. What is the standard symbol for centi?
  21. What is the standard symbol for liter?
  22. Is a cubic meter a derived or standard unit?
  23. Is a liter a derived or standard unit?
  24. Science..
    attempts to observe/explain the world.
  25. The forces that drive science are..
    defense, profit and benefiting mankind
  26. define law
    generalization that summarizes results - no explanation
  27. define hypothesis
    tentative explanation
  28. define theory
    explanation of why law exists
  29. define model
    physical or mathematical representation of theory
  30. write the model for the scientific method
  31. Matter..
    has mass, occupies space
  32. define energy
    the capacity to do work
  33. list the qualifications for mass
    • depends on quantity of matter, not dependent on location
    • cant be zero
    • measured in grams
  34. list the qualifications for energy
    • depends on gravitational force
    • measured in pounds
    • can be zero
  35. List the qualifications for solids
    • form: rigid
    • compressability: very low
    • shape: constant
    • volume: constant
    • movement of particles: vibration in fixed position
  36. List the qualifications for fluids
    • form: fluid
    • compressability: very low
    • shape: variable
    • volume: constant
    • movement of particles: slide, some attraction
  37. List the qualifications for gasses
    • form: fluid
    • compressability: very high
    • shape: variable
    • volume: variable
    • movement of particles: random, independent