Science Exam

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Author:
lexieb225
ID:
2455
Filename:
Science Exam
Updated:
2009-12-07 21:39:12
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Science Notes for Exam
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Description:
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
    Solid
  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
    Gases
  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
    Freezing
  9. solid to a liquid state, caused by raising the temperature
    Melting
  10. liquid to a gas state, caused when the liquid is heated
    Evaporation
  11. gas to a liquid, caused by a lowering of temperature
    Condensation
  12. solid to a gas without going through a liquid state
    Sublimation
  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
    Protons
  16. have a negative charge
    Electrons
  17. an electric charge build up in one place
    Static Electricity
  18. something that allows electricity to flow through it easily
    Conductor
  19. a substance that is a poor conductor of electricity
    Insulator
  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
    Resistance
  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.
    Circuit
  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)
    Switch
  31. an object that attracts other magnetic materials
    Magnet
  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.
    Electromagnet
  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....
    ends
  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.....
    field
  37. a push or pull
    force
  38. to pull together
    attract
  39. to push away
    repel
  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

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