April exam

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Author:
sim11r
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143733
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April exam
Updated:
2012-03-25 17:55:48
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science
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April science exam review part 1
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  1. An ecosystem includes
    all living and non living factors in enviorment
  2. Organisam that use the energy of the sun to produce glucose are called
    autotrophs
  3. Heterotrophs
    eat meat
  4. herbivores
    eat outotrophs
  5. food chain example
    • wheat-->mouse-->cat
    • autotroph --> herbivores ---> heterotrophs
  6. all organisams living in a given area are considered
    community
  7. Biotic
    • living part of enviorment
    • ie
    • plants bacteria animals
  8. Nitrification
    removing nitrogen gas from the atmosphere and incoporating it in living organisams
  9. animals get nitrogen from
    organisams they eat
  10. when population attains carrying capacity, its avrage growth is
    zero
  11. to become an ion
    need to either gain or lose electrons to have a full valance shell
  12. seven diatomic molecules
    I Have No BRight Or Cleaver Friends
  13. Synthesis
    two elements combine into two elements
  14. flame placed next to gs makes "pop" sound
    hydrogen
  15. Metals gain/lose valance electrons to become anions/cations
    merals gain valance electrons to become anions
  16. Non -metal gain/lose valence electrns to become cations/anions
    non metals lose valance electrons to become cations
  17. trinitrogen hexafluoride
    N3F6
  18. iron (lll) bromide
    FeBr3
  19. lead (ll) nitrate
    Pb(NO3)2
  20. magnesium hydroxide
    Mg(OH)2
  21. H2CO3
    carbonic acid
  22. HNO2
    nitrous acid
  23. synthesis
    ___H2+___O2-->___
    2H2O
  24. neutralization
    __Mg(OH)2+___H3PO4-->
    3Mg(OH)2+2H3PO4--> Mg3(PO4)2+6H2O
  25. double displacement
    ___NaOH+__Cu(NO3)2-->
    2NaOH+Cu(NO3)2--> 2NaNO3+CuOH2
  26. blue litmus paper -stays blue
    base
  27. red lithmus paper -turnes blue
    base
  28. Blue litmus paper - turnes red
    acid
  29. red litmus paper - stays red
    acid
  30. lewis dot diagram only show
    • element's valnce electrons
    • top-bottom-right-left
  31. law of conservation of mass
    mass stays the same as long as all gass,liquids are keepred
  32. 3 characteristics of acids
    • irrate skin
    • gives off H2
    • taste sour
  33. 3 charactaristics of bases
    • Bitter
    • want harm skin
    • gives of OH-
  34. what happens during nutralization
    • strong base neutralizes strong acid
    • both have to be the same strength and quantity
    • creating salt
  35. acid gives of
    H+
  36. base gives off
    OH-
  37. how does acid precipetion forms
    • gas ie NOx SO2 SO3
    • created when burning fossil fuels the gas combines with water molecules and then comes down as rain or snow
  38. acid precipitation
    • desingrates paint on statues
    • ie china
  39. how do scrubbers work
    • collect SO2 before it leaves
    • smokestacks changes it into less harmfull gasses
    • ie CO2 washing it away with water
  40. how does forest fires/ burrning disrupt CO2 cycle
    • When biomass is burned it releases excess CO2
    • but since biomass is burned
    • there is no autotrops to change the CO2 into 02
  41. Pollution/foffil fuels disruption in CO2 cycle
    burnning foffil fuels relases excess CO2
  42. role in nitrogen cycle
    N2 isn't usable therefore when lightning striks some makes N2 combines with O2 --> NO3
  43. role in nitrogen cycle
    Bacteria
    • changes into
    • N2 -->NO3
    • NO3 --> N2
  44. Role in nitrogen cycle of soil
    stores NO3 until plants absorve it
  45. role in nitrogen cycle of producer
    obsorb NO3 throught their roots then eaten by herbivores transfering NO3 up the food chain
  46. role of decomposers in nitrogen cycle
    decompose organic mater NO3 --> goes into soil
  47. density dependet
    depending on number of species in population
  48. density independet
    occurs no matter the size of population
  49. velocity
    spped and direction of an object
  50. speed
    how fast an object moves
  51. acceleration
    speed becomes gradualy faster in a direction
  52. 8.9 m/s --> km/h
    32.04km/h
  53. what distance car travelling 65km/hr travel in 3.0 hrs
    195km
  54. what was the acceleration of a sprinter who finishes traveling 22m/s if she run for 12sec
    1.8m/s2
  55. as car moves down a ramp the dots get further apart because
    car getting faster
  56. dots on the ramp are an example of
    acceleration
  57. dots on the flat part of the diagram represent
    constant velocity
  58. if force acting on an object is 155N what is the objects mass
    15.8kg
  59. Fgrav
    9.8 N
  60. if a car posses 50 000kg*m/s what would the car's momentum be if the velocity doubles and the mass tripled
    300 000kg*m/s
  61. what is the impulse on a vehicle if it crashes into a wall with force of 2100N over a period of 3.3 sec
    6930
  62. if a ball throwen into outerspace
    the ball will go on forever unless something hits it

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