Practice Quiz

SAT Chemistry - Question List

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136. Find the pH of the a 0.500M solution of the weak base Ammonia (NH3). The Kb = 1.78*10-5

NH3 +H2O --> NH4+ + OH-
  1. 13.01
  2. 9.13
  3. 10.52
  4. 11.48
  5. 12.37
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137. In the following titration reaction:

I2 + 2 S2O3- --> S4O6-2 + 2I-

starch is used as an indicator. When starch is exposed to iodine (I2) it is a deep blue color. When the iodine is reduced to iodide (I-), the solution will turn clear. Assume that it takes 100mL of 0.500M S2O3- to neutralize 50mL of I2 (indicated by the solution turning clear). What was the original concentration of iodine?
  1. 0.10M
  2. 0.25M
  3. 0.5M
  4. 0.6M
  5. 1.0M
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138. Which of the following statements about electrostatic energy is false?
  1. It is a form of potential energy, not kinetic energy
  2. It is a form of kinetic energy, not potential energy
  3. Electrostatic energy is stored in point charges, like electrons and protons
  4. The electrostatic energy of one charge alone is zero
  5. Electrostatic energy is equal to the work it takes to move two charges close together
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139. Which of the following isn’t true about electrostatic force?
  1. It measures the forces between two charges
  2. The magnitude of the force depends on the distance between two charges
  3. As electrons get closer, the forces that repel them from each other weaken
  4. As electrons get closer, the forces that repel them from each other increase
  5. Electrostatic force can be calculated using Coulomb’s Law
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140. Which of the following is false about the ionic character of bonds?
  1. Covalent bonds never have ionic character
  2. Covalent bonds have some ionic character because not all electron sharing is equal
  3. Due to partial ionic character, one atom in a covalent bond will have a partial positive charge
  4. Due to partial ionic character, one atom in a covalent bond will have a partial negative charge
  5. The ionic character of a bond is due to the polarity of the atoms in the bond.
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