Chem questions

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melissag94
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Chem questions
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2014-05-05 11:14:10
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chem final
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  1. t or f, the sum of the superscripts in an electron configuration represents the total number of neutrons in the atom
    false
  2. t or f, the outermost electrons (highest energy) are the electrons involved in reactions
    true
  3. t or f as electrons are filling the shell, they fill the highest energy shell first and then subsequent shells
    false
  4. t or f, electrons within an orbital have similar energies (all 1s electrons have the same energy, all 2s electrons have the same energy, etc.)
    true
  5. t or f columns in the periodic table are called groups
    true
  6. t or f, alkali metals are group 6 in the periodic table
    false
  7. t or f, calcium is an alkaline earth metal
    true
  8. t or f, the halogens are very reactive because they have an unpaired electron in the outer p-orbital
    true
  9. t or f, the noble gases are reactive because all their orbitals are filled
    false
  10. t or f, atoms tend to gain or lose electrons until they have obtained an electronic configuration that is the same as that of a noble gas (filled outer s and p shells)
    true
  11. t or f, a milligram (mg) is 1x10-3g
    true
  12. a calculator answer is 824.6059 must be rounded off to three sig fig. what answer is reported?
    825
  13. absolute zero is
    the coldest temperature possible
  14. a solid substance is subjected to a number of tests and observations. What test result would be classified as a chemical property of the substance
    It reacts with a base to form water
  15. what is an example of a physical change?
    grinding coffee beans
  16. the cubic centimeter cm3 has the same volume as a
    milliliter
  17. density equation?
    mass/volume
  18. how many centigrams are in 1 kilogram?
    1 x 105
  19. the ratio of the mass of a substance to its volume is its
    density
  20. an element is a substance which
    cannot be broken down into simpler substances physical or chemical means
  21. which of the following pairs of subatomic particles have charges of equal magnitude but opposite in sign?
    proton and electrons
  22. the nucleus of an atom is composed of
    tightly packed protons and neutrons
  23. an atom is electrically neutral because
    the number of protons and electrons are equal
  24. oxygen consists of three different ____, each having 8 protons but different number of neutrons
    isotopes
  25. as the mass number of the isotopes of an element increases, the number of protons
    remains the same
  26. all atoms of the same element have the same
    atomic number
  27. elements that is a nonmetal?
    nitrogen
  28. which of the following elements is a noble gas?
    argon
  29. consider a neutral atom with 30 protons and 34 neutrons. The atomic number of the element is
    30
  30. valence electrons are electrons located
    in the outermost energy level of an atom
  31. how many electrons can occupy the s sublevel at each energy level?
    2
  32. how many electrons can occupy the p sublevel at each energy level?
    6
  33. metals from group 2 of the periodic table form ions with a charge of
    2+
  34. what pair of electrons is isoelectric?
    O2- and Ne
  35. which element has the smallest atomic radii?
    fluorine
  36. which element has the largest atomic radius?
    francium
  37. which 3 elements are likely to have similar chemical and physical properties/
    • magnesium
    • calcium
    • strontium
  38. t of f, ionic compounds usually contain both a metallic and non-metallic element
    true
  39. t or f, in the molecule BF3, the boron atom is an exception to the octet rule
    ture
  40. t or f, three electrons shared between two atoms correspond to a triple bond
    false
  41. t or f resonance occurs when two or more different, valid lewis structures can be drawn for a molecule
    ture
  42. t or f, because the C-Cl bond in CClis polar, the CCl4 molecule will also be polar
    false
  43. t or f, is the molecule NH3 nonpolar?
    false
  44. t or f, the mole is the chemical unit of amount and represents a count of 6.02x1023 items
    true
  45. the compound CaI2 is named
    calcium iodide
  46. what is the correct chemical formula for sodium carbonate?
    Na2CO3
  47. the correct name for the compound NF7 is ?
    nitrogen heptaflouride
  48. the correct name for the compound, MnO2 is
    manganese (IV) oxide
  49. what is the correct name of the compound HCl?
    hydrochloric acid
  50. what is the correct formula for sulfuric acid?
    H2SO4
  51. what is the correct name for the compound Al2(CO3)3?
    aluminum carbonate
  52. what atom will most likely be the central atom in a molecule consisting of one atom each of carbon, oxygen, chlorine and hydrogen?
    carbon
  53. how many bonding pairs are around the central atom in the lewis structure of CO2
  54. how many nonbonding pairs are around the central atom in the lewis structure of the molecule H2O?
    2
  55. according to the VSEPR theory, what is the molecular geometry of H2O?
    bent
  56. t or f, osmosis may be definied as the movement of a solvent through a semipermeable membrane from a region of lower solute concentration to one of higher solute concentration
    true
  57. t or f, in normal room lighting, the eye can distinguish a true solution from a colloidal one
    false
  58. t or f, the heavier the solute molecule is, the greater the effect on the freezing point of a solution
    false
  59. t or f, the amount of freezing point depression or boiling point elevation depends only on the number of the solute particles added to the solution
    true
  60. t or f, the solubility of gases increases significantly at higher temps
    false
  61. t or f, osmotic pressure is the amount of pressure required to stop the flow across a semipermeable membrane
    true
  62. t or f, the boiling point of water is increased by dissolving salt in the water
    true
  63. t or f, ionic substances tend to dissolve easily in water
    true
  64. t or f, an aqueous solution of 8.38 molal ethylene glycol would show a decrease in freezing point of 15.6 C
    true
  65. which molecule can form hydrogen bonds?
    HF
  66. which of the following solutions would have the lowest freezing point?
    3.0 mole KNO3 (strong electrolyte) dissplved in 1 L of water
  67. in a solution, the solvent
    can be a solid, liquid or gas
  68. in water, a substance that does not dissociate in solution is called a
    nonelectrolyte
  69. what type of liquid displays the tyndall effect?
    colloidal suspension
  70. determine the type of intermolecular attraction in each of the following substances and choose the one expected to have the highest boiling point?
    CH3OH
  71. what property of liquids explains the formation of spherical water droplets on green leaves?
    surface tension
  72. to find normality?
    double the first number
  73. to which elements must hydrogen be bonded in order to display hydrogen bonding?
    • flourine
    • oxygen
    • nitrogen
  74. t or f, a liquid state will have a lower entropy than a solid state
    false
  75. t or f, a catalyst increases the rate of a chemical reaction and is not consumes in the process
    true
  76. t or f, the oxidizing agent is oxidized during an oxidation reduction reaction
    false
  77. t or f,the conversion of Mn2+ to  Mn 4+ is an oxidation reaction
    true
  78. t or f, a reaction is carried out in a coffee cup calorimeter. It is observed that the temperature of the contents of the calorimeter decreases. this means that the reaction is endothermic
    true
  79. t or f, the addition of an acid to water increases the [h30+] and decreases the pH
    true
  80. t or f,according the le chateliers principle, an increase in pressure applied to a mixture of gases at equilibrium will shift the reaction toward the side with more moles of gas
    false
  81. t or f,when the equilibrium constant for a reversible reaction is much greater than one, the equilibrium is said to lie to the right
    true
  82. t or f, when heat is added to an exothermic reaction, the reaction shifts to form more reactant
    true
  83. what word is used to describe a solution that contains a conjugate acid-base pair and is resistant to large changes in pH?
    buffer
  84. what will increase the rate of a reaction?
    • increasing the temperature
    • increasing the concentration of a reactant
    • adding a catalyst
    • ensuring that the reactants are properly aligned when they collide
  85. a substance that can behave as either an acid or a base is
    an amphiprotic substance
  86. the reaction of a strong acid with a strong bases produces a salt and another product. What is the identity of the other product?
    water
  87. the difference between a strong acid and a weak acid is that the strong acid ionizes ____ where as the weak acid ionizes ____
    • completely
    • slightly
  88. which species is a diprotic acid?
    H2SO4
  89. what is the conjugate base of H2SO4?
    HSO4-
  90. what generic process occurs at the anode of a voltaic cell?
    oxidation

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