Chemistry Tutor Competency Quiz

15 Questions | Total Attempts: 240

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Chemistry Tutor Competency Quiz

Questions and Answers
  • 1. 
    Which of the following statements describes the difference between endothermic and exothermic chemical reactions?  
    • A. 

      Energy is conserved in endothermic reactions but is not conserved in exothermic reactions.

    • B. 

      Endothermic reactions involve changes in the nucleus of an atom, but exothermic reactions do not involve changes in the nucleus.

    • C. 

      Energy is absorbed in endothermic reactions but is released in exothermic reactions.

    • D. 

      Endothermic reactions occur when electrons are shared between atoms, but exothermic reactions occur when electrons are transferred between atoms.

  • 2. 
    Which of the following is an intensive property?
    • A. 

      Mass

    • B. 

      Volume

    • C. 

      Density

    • D. 

      Length

  • 3. 
    Which physical method of separating mixtures would you use to separate colors in a dye?
    • A. 

      Chromatography

    • B. 

      Separating funnel

    • C. 

      Centrifugation

    • D. 

      Simple distillation

  • 4. 
    The process of splitting atoms is called ____________.
    • A. 

      Nuclear fusion

    • B. 

      Nuclear fission

    • C. 

      Radioactive decay

    • D. 

      None of the above

  • 5. 
    Molecular Orbital Theory describes the respective bond orders in H₂ , H₂ + , and H₂ – as _____________.
    • A. 

      1, 0, and 0

    • B. 

      1, 0, and ½

    • C. 

      1, ½, and ½

    • D. 

      1, ½, and 0

  • 6. 
    A triple bond consists of _________________.
    • A. 

      Three sigma bonds

    • B. 

      One sigma and two pi bonds

    • C. 

      Three pi bonds

    • D. 

      Two sigma and one pi bond

  • 7. 
    The proper name for N₂O₅ is _______________.
    • A. 

      Nitrogen pentoxide

    • B. 

      Dinitrogen pentoxide

    • C. 

      Nitrous oxide

    • D. 

      Pentaoxidgen dinitride

  • 8. 
    Which list of formulas represents compounds, only?
    • A. 

      CO₂, H₂O, NH₃

    • B. 

      H₂, N₂, O₂

    • C. 

      H₂, Ne, NaCl

    • D. 

      MgO, NaCl, O₂

  • 9. 
    Mass of an empty container = 3.0 grams Mass of the container plus the solid sample = 25.0 grams Volume of the solid sample = 11.0 cubic centimeters The data above were gathered in order to determine the density of an unknown solid. The density of the sample should be reported as
    • A. 

      0.5 g/cm3

    • B. 

      0.50 g/cm3

    • C. 

      2.0 g/cm3

    • D. 

      2.00 g/cm3

  • 10. 
    If 87.5 percent of a sample of pure 131I decays in 24 days, what is the half-life of 131I?
    • A. 

      6 days

    • B. 

      8 days

    • C. 

      12 days

    • D. 

      14 days

  • 11. 
    Body temperature is 98.6°F. What is the temperature in °C?
    • A. 

      32 degrees

    • B. 

      37 degrees

    • C. 

      39 degrees

    • D. 

      40 degrees

  • 12. 
    Which equation represents an oxidation reduction reaction?
    • A. 

      CH₄ + 2O₂ ==> CO₂ + 2H₂O

    • B. 

      H₂SO₄ + Ca(OH)₂ ==> CaSO₄ + 2H₂O

    • C. 

      MgCrO₄ + BaCl₂ ==> MgCl₂ + BaCrO₄

    • D. 

      Zn(NO₃)₂ + Na2CO₃  ==> 2NaNO₃ + ZnCO₃

  • 13. 
    A single protron has what electrical charge?
    • A. 

      No Charge

    • B. 

      Positive Charge

    • C. 

      Negative Charge

    • D. 

      Either a Positive or Negative Charge

  • 14. 
    What is the fourth most abundant element in the universe in terms of mass?
    • A. 

      Sodium

    • B. 

      Boron

    • C. 

      Helium

    • D. 

      Carbon

  • 15. 
    How many moles of solid Ba(NO3)2 should be added to 300. milliliters of 0.20-molar Fe(NO3)3 to increase the concentration of the NO3¯ ion to 1.0-molar? (Assume that the volume of the solution remains constant.)
    • A. 

      0.060 mole

    • B. 

      0.12 mole

    • C. 

      0.24 mole

    • D. 

      0.30 mole

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