physical science-midterm

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daphne17
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61673
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physical science-midterm
Updated:
2011-01-24 15:38:08
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midterm physical science Mrs Gamari
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physical science, Mrs gamari
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  1. what are the the steps of the scientific method?
    • 1.Make observations/develop a problem or purpose
    • 2.Develop a hypothesis
    • 3.Design an experiment
    • 4.Collect data and observations
    • 5.Draw conclusion
  2. What is an Independent variable?
    Variable that I change
  3. What is an Dependent variable?
    Variable that is measured
  4. What was the IV for the plastics lab?
    type of plastic/polymer
  5. What is the DV for the plastics lab?
    The distance that the plastic stretched after pulling on it
  6. Why is a control group important in an experiment?
    Important for comparison purposes. Considered the normal group -- the results that we would expect until we introduced the independent variable into the mix. Not all experiments have a control group.
  7. What is the proper format for a testable hypothesis?
    • If...then...because
    • If- sections deals with the independent variable Then- section deals with the dependent variable Because- section details research on the particular topic
  8. What does validity mean?
    Validity deals with how accurate experimental results are
  9. What is the formula for calculating density?
    Density = mass/volume
  10. What is matter?
    Anything that has mass and takes up space (volume)
  11. What is an element?
    A substance that cannot be broken down into smaller substances
  12. Indicate which type of change (physical or chemical) is taking place?
    -Baking a cake
    -Cutting grass
    -Melting ice
    -Iron rusting
    • 1.Chemical
    • 2.Physical
    • 3.Physical
    • 4.Chemical
  13. How many atoms are in the following compounds?
    -H2O
    -CO2
    -H2SO4
    • -3
    • -3
    • -7
  14. In which type of bonding are the electrons completely transferred between atoms?
    Ionic
  15. In which type of bonding are the electrons shared between the atoms?
    Covalent
  16. Name the three general properties of an acid
    1. Sour taste 2. Reacts to metal 3.Causes color to change in indicator
  17. Name the three general properties of a base
    1.Feels slippery 2.Bitter taste 3.Causes color to change in indicator
  18. How many bonds can a carbon atom form?
    With its four valence electrons, carbon can from four bonds
  19. Why is carbon referred to as such a versatile element?
    Carbon's four valence electrons allow it to form many different structures (branched chains, straight chains, and rings). It can form single, double, and triple bonds with other elements.
  20. Define organic compound
    Organic compound has carbon and hydrogen, and sometimes nitrogen and oxygen atoms COVALENTLY bonded together in a variety of compounds/structures
  21. When many monomers are linked together they form a_____
    Polymer
  22. Give an example of a synthetic polymer
    Plastics, rubber, and nylon
  23. Give an example of a natural polymer
    DNA, protein, carbohydrates, and natural rubber
  24. What are the three main types of fossil fuels?
    1. Petroleum 2. Natural gas 3. Coal

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