Practice Quiz

Praxis II: Chemistry Exam Prep - Question List

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61. Which of the following factors does NOT affect the rate of a chemical reaction?
  1. The presence of a catalyst
  2. Temperature
  3. Concentration of reactants
  4. Surface area of reactants
  5. Type of vessel holding the reactants
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62. Mg(s) + HCl(aq) --> This reaction forms an aqueous compound and a gas as products. What is the identity of the gas?
  1. Cl2(g)
  2. HCl(g)
  3. Mg(g)
  4. H2(g)
  5. MgCl2(g)
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63. Which of the following statements best describes chemical reduction?
  1. A loss of neutrons
  2. A gain of neutrons
  3. A loss of protons
  4. A loss of electrons
  5. A gain of electrons
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64. Which of the following straight-chain hydrocarbons is classified as saturated?
  1. C2H4
  2. C4H8
  3. C4H6
  4. C5H10
  5. C2H6
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65. The following list shows the ionization energies for sodium (Na) in order from first to fourth ionization energies: 495.8 kJ/mol; 4562.4 kJ/mol; 6912 kJ/mol; 9543 kJ/mol.Compare it to the same list for Magnesium and explain why the second ionization energy for Magnesium is much lower than the second ionization energy of sodium.In order from first ionization energy to fourth for Magnesium: 737.7 kJ/mol; 1450.6 kJ/mol; 7732.6 kJ/mol; 10,540 kJ/mol.
  1. Magnesium is a metal, and they always have lower second ionization energies. Sodium is a salt, so it doesn’t give away more than one electron.
  2. Magnesium is always a +2 ion, so the energy required to give away two electrons is low.
  3. By giving away one electron, Na reaches a noble gas configuration, so giving away a second electron takes a lot of energy.
  4. Since it has two electrons to give away before reaching noble gas configuration, the second ionization energy of Magnesium is low.
  5. Both C and D.
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