Chemistry 101: Practice Exam Quiz!

16 Questions | Total Attempts: 72

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Chemistry 101: Practice Exam Quiz! - Quiz

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Questions and Answers
  • 1. 
    Convert  3.4*10^6 nm→km.
    • A. 

      3.4*10^-3 km

    • B. 

      3.4*10^6km

    • C. 

      3.4*10^-6

    • D. 

      3.4*10^-12

  • 2. 
    Boiling point of liquid nitrogen is(-252.87C°), what is the boiling expressed on the Kelvin scale?
    • A. 

      20.13 k

    • B. 

      -20.13 k

    • C. 

      -200k

    • D. 

      53

  • 3. 
    The SI-unit for density is?
    • A. 

      G/m

    • B. 

      Kg/m

    • C. 

      Kg/m^2

    • D. 

      Kg/m^3

  • 4. 
    Which of the masses below is the smallest?
    • A. 

      2.5*10^-3 ng

    • B. 

      2.5*10^3 pg

    • C. 

      2.5*10^-1 ng.

    • D. 

      2.5*10^-3 mg

  • 5. 
    How many significant figures should be in the final answer for this calculation (5.657-2.33)?
    • A. 

      3

    • B. 

      2

    • C. 

      4

    • D. 

      5

  • 6. 
    How many (mg)are there in 2.5*10^-3 of CH3COOH?
    • A. 

      0.15

    • B. 

      150

    • C. 

      0.75

    • D. 

      75

  • 7. 
    How many Floride atoms are there in 25g AlF3?
    • A. 

      0.9

    • B. 

      5.3*10^23

    • C. 

      1.81*10^23

    • D. 

      9

  • 8. 
    An unknown compound has on empirical Formula of C3H4 the molar mass of the compound is 120 g/mol, what is the molecular formula?
    • A. 

      C6H8

    • B. 

      C12H12

    • C. 

      C9H12

    • D. 

      C3H4

  • 9. 
    In this reaction S+CL2——->SCL2, if the grams of S (16g) and the Grams of CL2 is (7.1g). How many grams of sulfur, is left unreacted?
    • A. 

      5.g

    • B. 

      10.2g

    • C. 

      12.8g

    • D. 

      9.6 g

  • 10. 
    In the last question if 3.5g of SCL2 were produced by experiment,what is the present yield of SCL2?
    • A. 

      83%

    • B. 

      34%

    • C. 

      60%

    • D. 

      90%

  • 11. 
    Calculate the molecules of CO2 produced when 58g C4H10 are reacted with 4g O2 according to the equation: C4H10 +13/2 O2—-> 4CO2+5H2O
    • A. 

      3*10^23 molecule

    • B. 

      0.65*10^23molecule

    • C. 

      0.46 *10^23 molecule

    • D. 

      10.2*10^23 molecule

  • 12. 
    Calculate the mass of NaCl produce when 10g of NaOH are reacted (100ml,0.1M)of HCL according to the equation : NaOH+HCL—->NaCL+H2O
    • A. 

      0.585g

    • B. 

      0.35g

    • C. 

      10.2 g

    • D. 

      1.25g

  • 13. 
    How many grams of Ca(OH)2  are required for 200 ml of 0.3  HCL solution:  Ca(OH)2+2HCL—->2H2O+CaCL2
    • A. 

      5.5g

    • B. 

      10g

    • C. 

      3.4g

    • D. 

      2.22g

  • 14. 
    Which of the following transition has the highest wavelength?
    • A. 

      N=1—->N=2

    • B. 

      N=2—->N=3

    • C. 

      N=3—->N=4

    • D. 

      None

  • 15. 
    Find the wave length of light emitted by a hydrogen atom during transition of it’s electron from N=1 to the N=4 principal energy level:
    • A. 

      1.3*10^-7m

    • B. 

      0.98*10^-7 m

    • C. 

      0.53*10^-7 m

    • D. 

      0.7*10^-7

  • 16. 
    Is the Periodic Table?
    • A. 

      True

    • B. 

      False

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