Practice Quiz

IB Chemistry Test Prep - Question List

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11. 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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12. 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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13. A fixed quantity of a gas undergoes a change in temperature from 100 K to 200 K and a change in pressure from 2 atm to 1 atm. After theses changes, the volume of the gas is
  1. Half of the original volume
  2. Unchanged
  3. Twice the original volume
  4. Four times the original volume
  5. Eight times the original volume
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14. Which of the following elements is the most electronegative?
  1. Cesium
  2. Sodium
  3. Lithium
  4. Boron
  5. Fluorine
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15. 1.75 moles of NaCl are dissolved in 1.00 kg of water. What is the boiling point of this solution (kb = .512 degrees C·kg/mol for water)?
  1. 101.79 degrees Celsius
  2. 100.00 degrees Celsius
  3. 98.21 degrees Celsius
  4. 102.22 degrees Celsius
  5. 100.50 degrees Celsius
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