Practice Quiz

SAT Chemistry - Question List

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126. What is the formal charge of the Nitrogen atom in NO3-?
  1. -2
  2. -1
  3. 0
  4. +1
  5. +2
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127. Using the ideal gas equation, find the pressure of 22.4L of helium at 273K when n=1.00 mol. Adjust this calculation using the real gas equation to find the actual pressure. What are the ideal and real pressures?
  1. 1.00 atm, 1.20 atm
  2. 1.0 atm, 1.00 atm
  3. 1.5 atm, 1.20 atm
  4. 1.5 atm, 1.00 atm
  5. 2.0 atm, 1.20 atm
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128. 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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129. Which of the following is not true about London dispersion forces?
  1. They are the weakest intermolecular forces
  2. They arise from temporary dipoles
  3. Dispersion forces are weakest between molecules that are easily polarized
  4. Larger atoms form dipoles easier than smaller atoms, so their dispersion forces are stronger
  5. Molecular shape affects the strength of London Dispersion forces
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130. A cell placed in pure water has swelled. Why?
  1. The cell was in an isotonic environment, so water flowed into it.
  2. The cell was in a hypotonic environment, so water flowed into it.
  3. The cell was in a hypertonic environment, so water flowed into it.
  4. The cell was in a hypotonic environment, so water flowed out of it.
  5. The cell was in a hypertonic environment, so water flowed out of it.
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