Practice Quiz

AP Chemistry Exam Prep - Question List

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51. You have a closed container filled with 1L of pure air at STP. Assume that this air is made of only nitrogen (79%) and oxygen (21%). What are the partial pressures of nitrogen and oxygen in the box?Hint: XN = PN/PTotal= NN/NTotal
  1. PN = 0.5 atm PO = 0.5 atm
  2. PN = 1.0 atm PO = 1.0 atm
  3. PN = .21 atm PO =.79 atm
  4. PN = .79 atm PO = .21 atm
  5. PN = .75 atm PO = .25 atm
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52. Which of the following is not true about colloids?
  1. Colloids are not solutions
  2. Colloids are made of larger particles that most solutions.
  3. The dispersing medium has a higher concentration than the dispersed phase
  4. The dispersing phase is in higher concentration than the dispersing medium.
  5. Colloids are homogeneous mixtures.
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53. 2Na + 2HCl --> 2NaCl + H2

If you start with 5g Na and 5g HCl, which is the limiting reactant? How much of the excess reactant is left at the end of the reaction?
  1. Limiting reactant: HCl Excess: 3.15g Na
  2. Limiting reactant: Na Excess: 2.93g HCl
  3. Limiting reactant: HCl Excess: 2.93g Na
  4. Limiting reactant: Na Excess: 1.85g HCl
  5. Limiting reactant: HCl Excess: 1.85g Na
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54. 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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55. Which of the following assumptions about gases is not found in the Kinetic Theory of Gases?
  1. Gas particles are infinitely small
  2. Gas particles are in constant motion
  3. Gas particles are in random motion
  4. Gases experience intermolecular forces
  5. Energy is proportional to temperature
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