chemistry 1010 Test 1 Review

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chemistry 1010 Test 1 Review
2012-09-17 13:10:01
Chemistry1010 heather fimbres metropolitan community college Geringer

For chem 1010 test 1
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  1. A physical combination of 2 or more substances that does not have a uniform composition
    heterogenous mixture
  2. The first step in the scientific method is
    to make an observation
  3. One ml is the same as
    1 centimeter cubed
  4. What are some physical properties?
    • Color
    • Density
    • Hardness
    • Solubility
    • phase change
  5. what are some chemical changes?
    Reactions with water and oxygen. Combustable.
  6. Organic chemistry is?
    the chemistry that involves carbon compounds
  7. Sodium Chloride NaCl is an example of
    a pure substance compound
  8. phase change from gas to liquid is
  9. SI stands for
    international system
  10. Pure substances are either
    compounds or elements
  11. is melting, freezing, and evaporating a chemical change or physical change?
  12. Units of mass are
    Grams, kilograms..
  13. SI unit of volume
  14. How many significant figures are in 12.000
    5 because trailing zeros count if there is a decimal in the problem
  15. Getting the outcome or value that you are supposed to get is the
  16. Freezing point of water in Fahrenheit is...
    32 degrees
  17. data that is consistent time after time and is mathematically measurable is
    Natural law
  18. Biochemistry involves
    chemicals in living organisms like hormones and enzymes
  19. Evidence of a chemical reaction can be...
    permanent color change, release of gas, forming a precipitate, giving off or taking in heat, giving off light, forming water
  20. a physical combination of two or more substances
  21. blue elements on the periodic table are ... at room temp?
  22. what does ductile mean?
    stretched into a wire
  23. the difference between a law and a theory is
    a law is measurable
  24. how many milli's are in one Kilo?
  25. reproducibility of measurements is the
  26. The scientist that first organized scientific research into a format now called the scientific method is...
    Robert Boyle
  27. Matter is...
    Any thing that has mass and occupies space
  28. how many significant figures are in 12000?
    2 because the trailing 0s don't count if there is no decimal in the problem
  29. mass is measured with a
  30. what NONmetal is liquid at room temp?
    Br (Bromine)
  31. how many milli are in one base?
  32. Formula for finding specific heat is..
    heat energy / mass * change in the temp
  33. Define: Alloy
    a homogenous mixture of 2 or more metals.
  34. chemistry is the study of
    the composition and property of matter
  35. the symbol for micro is
    (MU) u
  36. Units of weight
    pounds, newton
  37. boiling point of water in Kelvin
  38. heat energy can be measured in
    calories, joules, and kilojoules
  39. Early chemists that were involved with mysticism and experimentation were called
  40. Oil water and sand are examples of...
    heterogenous mixtures
  41. Weight is
    the effect of gravity
  42. round off 120055 to 4 significant figures. .
  43. Freezing point of water in Kelvin
  44. How many sig figs are in 0.000120
    3 because leading zeros never count and there is a decimal so the trailing zeros DO count
  45. Methods of physcially seperating mixtures
    Distillation, filtration, magnetism, evaporation
  46. Formula for finding the mass if you know the volume and density
  47. if the mass of the reactants if 4 grams hydrogen and 15 grams of oxygen, how much water can be made?
    19 grams of water
  48. weight is measured with a
    spring scale
  49. what does malleable mean?
  50. Phase change from a gas to a solid is called
    deposition (skips the liquid phase)
  51. What are the properties of metals?
    shiny, good conductors, high density, solid at room temp, malleable and ductile.
  52. What metal is liquid at room temp?
    Hg (mercury)
  53. What do the black symbold on the periodic table represent?
    They are solid at room temp
  54. chemical combination of two or more substances
  55. the fromula for finding the density is
  56. how many micros are in one base
  57. How many sig figs are in 1256
  58. SI unit of mass is
  59. Phase change from solid to a liquid is called
  60. SI unit for temp is
  61. How many base units are in one Kilo?
  62. SI unit for number of some thing is
  63. Any attempt to explain your observation is the
  64. Salt water and air are examples of
    homogenous mixtures
  65. the simplest pure substance that cannot be broke down any further is
    an element
  66. A physcial combination of a substance that has uniform composition
    an element
  67. Round 40915 to 3 sig figs
  68. Phase change from solid to gas is
    sublimation ( skips liquid phase)
  69. law of conservation of mass is
    matter is neither created or destroyed it just changes from one thing to another
  70. the density of water at 4 degrees celsius is
    1.0 g/ml
  71. how many sig figs are in 12001
    5 because captive zeros always count
  72. What elements are SEMI metals?
    B, Si, As, Te, At, Po and some times Ge
  73. Boiling point of water in celsius is
    100 degrees
  74. freezing point of water in celsuis is
    0 degrees
  75. the measure of average kenitic energy of a substance is the
  76. the four states of matter are
    Gas, Liquid, Solid, and plasma
  77. Is chewing food a chemical or physcial reaction
  78. data that attempts to explain a natural phenomena is a
    natural theory
  79. Is dissolving some thing a physical or chemical reaction
  80. the amount of mass a substance has in a given volume is the
  81. A heat calorie is defined as
    the amount of heat energy that it takes to change one gram (ml) of water 1 degree celsius
  82. the formula for finding the specific gravity is
    density of the substance/density of water at 4 degrees celsius
  83. Al(C2H3O2)3 has how many total atoms?
    22 total
  84. red element on the periodic table are
    gas at room temp
  85. one calorie = ___ joules
  86. the composition of what some thing is made of is its
  87. The state of matter that has the most kenitic energy is the
    gas (excluding plasma)
  88. Formula for changing celsius to fahrenheit
    F = (9/5C) +32
  89. Specific heat is
    The amount of energy it takes to change one gram of any substance to one degree celsius
  90. Formula for changing fahrenheit to celsius
    C = 5/9 (F-32)
  91. Define temperature
    The measurement of the average Kinetic energy within a system
  92. Natural law is often expressed as a...
    Mathematical equation
  93. Science can be defined as
    the methodical exploration of nature followed by a logical explanation of the observation
  94. Biochemistry
    the chemistry of substances derived from plants and animals
  95. no instrement of measurement is...
  96. Accuracy
    the closeness of a measurement to the true value
  97. Percision
    Reflects the reproducibility of a measurement
  98. Time is defined in terms
  99. Intensive property
    independent of the size of the sample
  100. Specigic gravity
    • the ratio of the density of a liquid to the density of water at 4 degrees C
    • D 4ºC
    • DH2O     = 1.000g/cm3
  101. Heat
    The form of energy that is transferred between samples of matter because of a difference in temp
  102. A compound
    Can be broken down into elements by an ordinary chemical reaction
  103. Non metals
    • low density
    • low melting point
    • poor conductors of heat and electricity
    • In the solid state they are dull and are not malleable or ductile
  104. Law of definite composition
    Compounds always contain the same elements in a constant proportion by mass
  105. Examples of chemical changes
    • Digesting food
    • A rotting banana
    • toasting bread
    • burning gasoline
  106. Endothermic
  107. Exothermic
    given off