Chemistry Final

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moses1424
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96513
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Chemistry Final
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2011-08-09 20:32:15
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Chemistry Final
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Chemistry Final
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  1. Double and triple bonds for because?
    Single covalent bonds do not give all the atoms in the molecule 8 valence electrons.
  2. The ability of an atom to attract the shared electrons in a covalent bond is its?
    Electronegativity.
  3. Which of the folowing substances contains a nonpolar bond?
    A) H2O
    B)MgF2
    C) N2
    D) NaCl
    C) N2
    (this multiple choice question has been scrambled)
  4. Which compound contains a polar covalent bond?
    A) HCl
    B) Br2
    C) MgO
    D) O2
    A) HCl
    (this multiple choice question has been scrambled)
  5. Which of the folowing elements has the lowest electronegativity?
    A) N
    B) O
    C) Li
    D) F
    C) Li
    (this multiple choice question has been scrambled)
  6. Which of the following compounds contains an ionic bond?
    A) CH4
    B) H2O
    C) NH3
    D) CaO
    D) CaO
    (this multiple choice question has been scrambled)
  7. The VSEPR theory allows us to determine?
    Shape of a molecule
  8. How many covalent bonds will hydrogen atom normally make?
    1
  9. When two or more equivalent dot structures can be written for a given molecule it is said to have?
    resonance
  10. Water has a boiling point of 100C and alchohol has a boiling point of 78C, even though water is a smaller molecule , the large difference in boiling point is due to?
    more hydrogen bonds between the molecules
  11. In a solution the solvent can be what form of matter?
    solid liquid or gas
  12. When KCl dissolves in water....
    The K+ ions are attracted to the partially negative oxygen atoms of the water molecules.
  13. In water, the substance that ionizes completely in a solution is called?
    strong electrolyte
  14. The molarity of a solution refers to?
    moles of solute per liters of solution
  15. According to Henry's law, the solubility of a gas in a liquid ....
    increases as a the gas pressure above the liquid increases
  16. The mass/mass percent concentration refers to the number of grams of solute in...?
    100g of solution.
  17. Hydrogen Sulfide has a similar shape to_____.
    A) water
    B) carbon monoxide
    C) carbon tetrachloride
    D)Carbon dioxide
    A) Water
    (this multiple choice question has been scrambled)
  18. The shape of an ammonia molecule is____.
    Trigonal Pyramids
  19. Which of the following compounds will not be soluble in water?
    A) LiNO3
    B) PbS
    C) MgCl2
    D) K2SO4
    B) PbS
    (this multiple choice question has been scrambled)
  20. A catalyst is?
    A substance that speed up the reaction without being consumed in the reaction.
  21. For any chemical reaction to occur the reactants must...
    collide with sufficient energy to break bonds.
  22. When a reaction is at equilibrium ....
    the forward and reverse reactions must occur at the same rate.
  23. A reaction that can proceed in either the forward or the reverse direction as written is called_____?
    Reversible
  24. The actrivation energy of a chemical reaction is the energy that....
    initiates the reaction.
  25. The equilibrium constant for the production of carbon dioxide from carbon monoxide and oxygen is Kc=2*1011. This means that the reaction mixture at equilibrium is likely to consist of....
    Mostly products.
  26. In any chmical reaction the rate of reaction can be increased by....
    A) Adding product molecules to the reaction mixture.
    B) Changing the size of the container.
    C) Increasing the concentration of the reactants.
    D) Decreasing the temperature.
    E) Adding water to the reaction
    C) Increasing the concentration of the reactants.
    (this multiple choice question has been scrambled)
  27. The process by which a necleus breaks down by emitting radiation is known as _______?
    Radioactive decay.
  28. Why is it important that radioactive isotopes used in diagnostic tests have short half-lives?
    Minimizes the harmful side effects of the radioation.
  29. The half life of a radio isotope is...?
    one half of the time it takes for an isotope to completely decay to a non-radioactive isotope
  30. When an atom of Uranium is bombarded with neutrons, it splits into smaller neclei and produces a great amount of energy. This process is called_____?
    Fission
  31. In the sun, nuclei of hydrogen combine to form a larger nucleus and release great amounts of energy. This process is known as______
    Fusion
  32. Refridgerating perishable foods affects biochemical reactions by_____?
    Decreasing the rate of reaction affecting spoilage.
  33. One metal used as a catalyst in a catalytic converter in an automobile is________.
    Iron
  34. Treatment of carbon monoxide poisonig can be accomplished by the use of pure oxygen for breathing. This is an example of _______ in a clinical setting.
    Le Chatelier's Principle
  35. According to the Arrhenious concept if HNO3 were dissolved in water it would act as an.....
    Acid
  36. The name given to an aqueous solution of HBr is _______?
    Hydrobromic Acid
  37. The correct formula for sulfuric acid is _______?
    H2SO4
  38. One example of an Arrhenious Base is ...
    A) C2H4O2
    B) KOH
    C) H2O2
    D) NaCl
    KOH
  39. Acetic acid is an example of a
    Weak acid
  40. Which of the following is correctly identified?
    A) H2CO3 Strong Acid
    B) NaOH Strong Base
    C) Ca(OH)2 Weak base
    D) HCl, Weak acid
    B) NaOH
    (this multiple choice question has been scrambled)
  41. Has a sour taste
    Acid, Base, or Neutral?
    Acid
  42. has a ph of 4.5
    Acid, Base, or Neutral?
    Acid
  43. Contains more hydronium ions than hydroxid ions
    Acid, Base, or Neutral?
    Acid
  44. H2O
    Acid, Base, or Neutral?
    Neutral
  45. [H3O+]=3.4*10^-5m
    Acid, Base, or Neutral?
    Acid
  46. [OH-]=2.8*10^-2M
    Acid, Base, or Neutral?
    base
  47. Ca(OH)2
    Acid, Base, or Neutral?
    Base
  48. An acid and base react to form a salt in a(n)_________reaction.
    Neutralization
  49. The function of a buffer is too?
    maintain the pH of a solution
  50. Which of the following is a buffer system?
    A) HCl and NaOH
    B) NaCl and NaOH
    C) H2CO3 and KHCO3
    D) H2O and HCl
    C) H2CO3 and KHCO3
    (this multiple choice question has been scrambled)
  51. A solution of NaOH will turn phenolphthalein pink
    True or false?
    True
  52. A solution of HCl will taste bitter
    True or False?
    False
  53. For most reactions of acids with bases, the resulting products are a salt and water.
    True or False?
    True
  54. The Ka for hydroflouric acid is 7.2x10^-4. This means HF is....
    A) Neutral in water
    B) Ionic
    C) Strong Acid
    D) a weak acid
    D) Weak acid
    (this multiple choice question has been scrambled)
  55. Water is an example of a ________compound.
    Amphoteric
  56. A solution has a pH of 12.6. This solution is
    A) basic
    B) Strongly Basic
    C) Acidic
    D) Strongly acidic
    B) Strongly Basic
    (this multiple choice question has been scrambled)
  57. In an oxidation....
    Loss of an electron gain an oxygen
  58. In an oxydation reduction reaction, the substance reduced always.....
    Shows a gain of electrons
  59. In a voltaic cell, a zinc sulfate solution is one half-cell, and copper cathode in a copper sulfate solution in the other half-cell, the two half cells are connected by what to complete the battery?
    Salt bridge
  60. Iron coated with Zinc to prevent corosion is known as_______iron.
    galvanized
  61. The green color of copper exposed to air is due to _______ of the surface of the copper.
    Oxidation
  62. A battery used in a car is known as what type of battery?
    Lead storage
  63. Zinc is above gold in the activity series. This means that_______.
    Zinc will giv electrons to gold ions
  64. When a primary alchohol is oxidized the product is a(n)________.
    aldehyde
  65. What type of alcohol is oxidized to produce a ketone?
    secondary
  66. Compounds that have the same molecular formula but different arrangements of atoms are called?
    Isomers
  67. Long-chain molecules that consist of many repeating units are called_______?
    polymers
  68. Insects communicate with chemicals called?
    pheromones
  69. Physiologically active nitrogen-containing compounds producedby plants are called_____.
    Alkaloids
  70. When Oxygen is in it's elemental form, O2, it has an oxydation number of 0.
    True or False?
    True
  71. When hydrogen and oxygen are converted to water, the hydrogen is reduced.
    True or False?
    False
  72. In the compound, Fe2O3, the oxygen has an oxidation number of -2.
    True or False?
    True
  73. Electrical enegery is generated in a voltaic cell.
    True or False?
    True
  74. Organic chemistry is the study of the chemistry of carbon compounds.
    True or False?
    True

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