Science Exam

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Science Exam
2009-12-07 21:39:12
Science Notes for Exam

Matter, Electricity, and Magnets
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  1. has a definite size & shape; particles packed together tightly; molecules move in a slow, constant motion; high melting boiling point
  2. has a definite size & shape; particles more active and far apart; low melting point; lower boiling point than solid; active at room temperature
  3. Liquid
  4. no definite size or shape; fills whatever container it occupies; particles move freely & are far from each other
  5. Water freezes at???????
    320 F or 00 C
  6. Water boils at????????
  7. 2120 F or 1000 C
  8. change from a liquid to a solid state, caused by a lowered temperature
  9. solid to a liquid state, caused by raising the temperature
  10. liquid to a gas state, caused when the liquid is heated
  11. gas to a liquid, caused by a lowering of temperature
  12. solid to a gas without going through a liquid state
  13. Electricity
    the energy resulting from the flow of electrons
  14. results when an object has to many or to few electrons
    Electric Charge
  15. have a positive charge
  16. have a negative charge
  17. an electric charge build up in one place
    Static Electricity
  18. something that allows electricity to flow through it easily
  19. a substance that is a poor conductor of electricity
  20. a steady flow of electrons or other charged particles through a conductor
    Electric Current
  21. a flow of electrons in one direction such as in a battery
    Direct Current (DC)
  22. current that changes directions
    Alternating Current (AC)
  23. the difference in energy between the electrons in one place and the energy in the electrons in another place
    Potential Difference
  24. how hard it is to push electrons through a conductor
  25. rate at which a device changes electricity into another form
    Electric Power
  26. the energy used by an electrical device. The amount of energy depends on the amount of power delivered and the length of time the power is used.
    Electrical Energy
  27. an unbroken path formed by electrical conductors. In order to flow, a current must have and uninterrupted loop of electrical conductors. The electricity will flow from negative to positive ternminals.
  28. has only one path for the current to follow. The current is the same in every part of the circuit. If any part of the circuit is broken, the current stops. (Christmas tree lights, if one goes out they all go out)
    Series Circuit
  29. two or more separate branches for the current to flow. If the circuit is broken in one branch, the current will still flow to other parts of the circuit. (house electricity)
    Parallel Circuit
  30. a device on a circuit that can open and close the pathway to start and stop the flow of electricity (When the switch is open, there is no flow. Closed- no flow)
  31. an object that attracts other magnetic materials
  32. substances that can be made into magnets by running electricity through them. To strengthen this, you can add more loops or increasing the current in the wire.
  33. the opposite ends of a magnet. The magnetic force is strongest at these locations. The poles are labeled north and south.
    Magnetic Poles
  34. the magnetic effects of a bar magnet are strongest near the....
  35. sprinkling iron filings over a bar magnet shows the magnet's....
    a.relative strength
    b. field lined
    c.magnetic field
    d. all of the above
    d. all of the above
  36. The area around teh magnet in which magnetic forces can be felt is called the magnetic.....
  37. a push or pull
  38. to pull together
  39. to push away
  40. the region around the magnet where the magnetic force acts. This region is near the poles, but extends out from the actual
    Magnetic FIELD
  41. Magnets that are permanate (never turn off)
    bar magnet