Chem 101 test

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Chem 101 test
2012-02-15 14:08:05
Chem 101

chp 1-3,5
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  1. Chemistry
    The study of matter and the changes it undergoes.
  2. Technology
    The practical application of knowledge.
  3. Science
    An accumulation of knowledge about nature and our physical world based on observations and experimental tests of our assumptions.
  4. Hypothesis
    A tentative explanation of observations.
  5. Theory
    The best current explanation for a phenomenon.
  6. Scientific Law
    A brief statement that summarizes large amounts of data.
  7. Scientific model
    Uses tangible items or pictures to represent invisible processes and help explain complex phenomena.
  8. Variables
    Things that can change during an experiment.
  9. Applied Research
    Make particular kinds of products useful.
  10. Basic Research
    Obtain new knowledge or to answer fundamental questions.
  11. Matter
    Anything that has mass and takes up space.
  12. Mass
    A measure of the amount of matter in an object.
  13. Weight
    Represents the gravitational force of attraction for an object
  14. Physical Properties
    • Matter can be observered without making new substances or changing its composition.
    • Ex: temp, mass, boiling
  15. Chemical Properties
    • New substances are formed when observed and has a change in composition.
    • Ex: rusty, burn, explode
  16. Physical Change
    • A change in appearance of matter without changing its chemical identity or composition.
    • Ex: Melting ice, hair cut
  17. Chemical Change
    • A change in the chemical identity of matter into other substances that are chemically different.
    • Ex: Iron rusts, lemon juice converts milk to curds.
  18. States of Matter
    • Solid- had definite shape and volume
    • Liquid- has definite volume, but takes shape of container.
    • Gas- takes both shape and volume of container.
  19. Substance
    • Has a definite compostion that does not vary from sample to next.
    • Ex: pure gold, pure water
  20. Mixture
    May have many different compositions depending on how its prepared.
  21. Element
    Composed of all the same atoms.
  22. Atom
    Smallest particle of an element.
  23. Compound
    Made up of two or more elements, chemically combined in fixed proportions.
  24. Molecule
    Groups of atoms bonded together as one unit.
  25. Energy
    • The ability to change matter physically or chemically.
    • Potential Energy- stored energy
    • Kinetic Energy- energy in motion
  26. Heat
    Energy flow from a hot object to a cold one.
  27. Temperature
    Measure of how hot or cold an object is.
  28. Density
    • "how heavy something is for its size"
    • m/v
  29. calorie
    The amount of heat required to change temp of 1g of water by 1*c
  30. candy