Science

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Author:
bbonnette
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124329
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Science
Updated:
2011-12-19 21:27:25
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physical science
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exam study guide
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  1. Mega is the SI prefix for what?
    million
  2. How close the value is to the true value is called what?
    accuracy
  3. Metals, nonmetals, ad semiconductors are the three main groups of...
    elements
  4. Semiconductors conduct...
    electricity and heat under certain conditions
  5. J, N.m, kg. m2/s2 are units of what?
    work
  6. What happens to energy during evaporation?
    absorbed
  7. Magnetic fields are produced by electric...
    currents
  8. A measurement that is accurate is close to its....
    true value
  9. Give examples of compounds.
    sugar, salt, water
  10. Energy can be transferred as...
    heat
  11. Give an example of double displacement reaction.
    switch their compound
  12. How many atoms are in the compound 2NaO2?
    6
  13. A star is born as a ________ and ________ cloud.
    gas and dust
  14. Atomic mass is...
    the atom's mass
  15. The atomic number is...
    the number of protons
  16. All weather occurs in the ___________ part of our atmosphere.
    troposphere
  17. Define temperature.
    the measure of the average heat of a particle
  18. amu stands for...
    atomic mass unit
  19. Signs that a chemical change has taken place are...
    odor, color, light, heat, sound
  20. Compounds and element represent...
    pure substances
  21. Name 6 simple machines.
    lever, pulley, wedge, wheel and axle, screw,and inclined plane
  22. Particles of the same temperature move at different speeds if their _______ are different.
    masses
  23. For solutes to dissolve quickly name 3 things you can do.
    heat, stir, crush
  24. On a ph scale, where are acids?
    0-7
  25. On a ph scale, where are neutrals?
    7
  26. On a ph scale, where are bases?
    7-14
  27. Define sublimation.
    solid to a gas
  28. State the 4 states of matter.
    solid, liquid, gas, plasma
  29. .01 can also be expressed as...
    10-2
  30. Give examples of mixtures.
    salad dressing and chocolate milk
  31. Give examples of mixtures.
    salad dressing and chocolate milk
  32. In a chemical reaction, atoms are...
    rearranged
  33. Energy is released when ice melts to form a...
    liquid
  34. Define weight.
    pull of gravity
  35. The ___________ theory helps to explain the differences between states of matter.
    kinetic
  36. The ____________ theory states that the universe began with a gigantic explosion.
    The Big Bang
  37. An equation must be balanced to show that....
    mass is conserved
  38. Define molecule.
    a group of atoms that act as a unit
  39. What is the scientific method?
    a series of steps
  40. The kinetic theory stte when temperatures are high, the particles move....
    faster
  41. Chemical changes can only be reversed by....
    chemical changes
  42. In stars, energy is released as a result of...
    fusion reactions
  43. At the freezing point, substances change from a liquid to a ___________.
    solid
  44. Where do earthquakes occur?
    at plate boundries
  45. Negative acceleration occurs when an object...
    slows down
  46. Magnetic fields are produced by....
    electric currents
  47. Good conductors of hear are...
    metals
  48. Anything left running for long periods of time becomes hot due to the transfer of ...
    energy
  49. Knowing the chemical properties of a substance tells you how it _________with others.
    reacts
  50. _______ electrons determine an atom's chemical properties.
    valence
  51. The particles of solids, liquids, and gases are in constant...
    motion
  52. ______ and _______ determine the speed of atoms and molecules.
    size of particles and temperature of substances
  53. A screwdriver is an example of what type of simple machine?
    wheel and axle
  54. What is the difference between speed and velocity?
    direction
  55. Alkali metals are highly reactive because they have _____ valence electron(s).
    1
  56. Speed formula...
    speed = distance divided by time
  57. There is an attraction when charges are ______.
    opposite
  58. Solids, liquids, gases have mass, _______, and are made of __________.
    take up space........atoms
  59. Solids, liquids, and gases are in .....
    constant motion
  60. Explain a synthesis reaction.
    2 elements combine and form a compound
  61. Describe ionic and covalent bonding.
    • ionic = transferred
    • covalent = sharing
  62. What is negative acceleration?
    changes direction
  63. Momentum =
    mass x velocity
  64. Elements in the same family have similar _______ and _______.
    chemical properties and appearance
  65. What is negative acceleration?
    changes direction
  66. Bases are...
    bitter, slippery, and turn blue
  67. The second element in an ionic compound ends in...
    ide
  68. Elements that share properties of metals and nonmetals are...
    metalloids
  69. As elements move from left to right across the periodic table they become less...
    metallic
  70. A net force of zero means objects remain ________ and are ____________.
    at rest ......balanced
  71. Law of Conservation of Mass...
    Mass cannot be created nor destroyed
  72. Example of homogeneous mixtures is...
    soft drinks
  73. Example of heterogeneous mixture is...
    salad
  74. Name families on the periodic table.
    noble gases, earth, alkalide,....
  75. Efficiency is the ratio of ....
    useful work output to work input
  76. Chemical equations can only be balanced by changing or adding what?
    coefficients
  77. What are some units of power?
    watts, joules, horsepower
  78. When a gas increases in _______, it increases in pressure.
    temperature
  79. Who published the first periodic table?
    Mendeleev
  80. Valence electrons determine at atom's ________.
    chemical properties
  81. Waves travel the quickest through...
    solids
  82. An electron motor converts electric energy into ____________energy.
    mechanical
  83. Which state of matter is not a fluid?
    solid
  84. Which states of matter form solutions?
    gas-liquid.....solid-liquid....solid-solid
  85. What increases in an exothermic reaction?
    temperature
  86. Electrons on the periodic table are related by ___________ arrangement.
    electron
  87. An explanation that has been tested by many observations is a __________.
    scientific theory
  88. The opening of a skydiver's parachute explains what?
    air resistance
  89. An object accelerating near earth's surface are in _____________.
    free fall
  90. Chemical bonds hold ___________ and _______ together.
    atoms ......ions
  91. Light travels as _________ waves.
    electro magnetic
  92. Medium for sound waves...
    air
  93. Medium for water waves...
    water
  94. Medium for seismic waves...
    earth
  95. Gravitational potential energy depends upon _______, ________ of object, and ___________.
    height.....mass....acceleration due to gravity

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