Chemistry 102 : Can You Pass This Trivia Test? Quiz

30 Questions | Total Attempts: 39

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Chemistry 102 : Can You Pass This Trivia Test? Quiz

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Questions and Answers
  • 1. 
    Calculate the concentration of CO, P= 3*10-4 atm , if the K=3.4*10-2 M/atm.
    • A. 

      16*10-7

    • B. 

      10*10-6

    • C. 

      11*10-6

    • D. 

      17*10-7

  • 2. 
    If the molar mass of glucose is 180g/mol, the solubility of glucose in the water at 200c is 30g/100ml is a 1.22M solution of glucose at 200c:
    • A. 

      Saturated

    • B. 

      Unsaturated

    • C. 

      Super saturated

    • D. 

      None

  • 3. 
    2M solution of Nicl2 has a density of 2.18Kg/ml, calculate the molality if ( M.m=129.7g/mol)?
    • A. 

      9*10-3 m

    • B. 

      9.175*10-4 m

    • C. 

      8.1*10-4 m

    • D. 

      9.9*10-4 m

  • 4. 
    The vapor pressure of water at 1100c is 1070 torr, a solution of ethylene , and water has a vapor pressure of 1atm , what is the mol fraction of ethylene?(1atm=760 mmHg = 760 torr)
    • A. 

      0.71

    • B. 

      0.55

    • C. 

      0.29

    • D. 

      0.77

  • 5. 
    Calculate the freezing point and boiling point of solution made of 25% by mass of CH2OHCH2OH (62 g/mol) in water give that (Kf of H2O=1.86) (Kb of H2O=0.5)
    • A. 

      -9.92 , -102.72

    • B. 

      -9.92,102.72

    • C. 

      9.92, 102.72

    • D. 

      9.92, -102.72

  • 6. 
    2NO2-----> 2NO+O2 has a rate constant K=0.63 M-1 S-1 , IF [NO2]=0.1 M, what is the half life ?
    • A. 

      15.8

    • B. 

      15.0

    • C. 

      16

    • D. 

      16.1

  • 7. 
    Ea= 65.7 KJ/mol, how many times faster the rxn will occur at 500c to 00c?
    • A. 

      77.32

    • B. 

      88

    • C. 

      88.234

    • D. 

      90

  • 8. 
    2N2O------> 4NO2+O2, and (K=6.82 S-1) we stated with 0.025 mol in 2 L, How many moles of N2O5 will remain after 5 min?
    • A. 

      3.232*10-3 mol

    • B. 

      4*10-2 mol

    • C. 

      5*10-3 mol

    • D. 

      3.99 *10-3 mol

  • 9. 
    A+B -------> C. if ( V=k[A]* [B]m ) and [A]=0.1 ,[B]=0.5 ,,, find V and K ? [A] [B] V 0.25 0.25 0.2130 0.25 0.125 0.1065 0.2 0.1 0.0682 0.35 0.1 0.1193 0.175 0.1 0.0596
    • A. 

      V=0.1705 M/S K=3.41 M-1.S-1

    • B. 

      V= 0.77 M/S K = 3.3 M

    • C. 

      V= 1.3 M/S K = 4.1 M-2.S-2

    • D. 

      V=1.1 M/S K=0.5 S-1

  • 10. 
    A catalyst:
    • A. 

      Increase reaction rate by lowering the activation energy of forward reaction

    • B. 

      Increase reaction rate by increasing activation energy for reverse reaction

    • C. 

      Increase the reaction rate by providing an alternative energy

    • D. 

      None of the above

  • 11. 
    (2NO+Br-2 ---------->   2NOBr) KC1=2 ( 2NO- -------> N2+O2) KC2=2.1*1030 At temperature=298 K Calculate Kp of (N2+O2+Br-2à2NOBr)
    • A. 

      4.2*1030

    • B. 

      9.5*10-31

    • C. 

      3.9*10-32

    • D. 

      4*10-32

  • 12. 
    Calculate pH for .5 M of HF (Ka =7.1*10-4)
    • A. 

      1.725

    • B. 

      0.01884

    • C. 

      3.77

    • D. 

      4.4

  • 13. 
    A substance that is capable of acting as both acid and base is called:
    • A. 

      Conjugated

    • B. 

      Amphoteric

    • C. 

      Autocratic

    • D. 

      None

  • 14. 
    Mixture of 5 ml of .105 M KOH and 15 ml of 9.5*10-2 M of Ca(OH)2 find Ph ?
    • A. 

      0.1425

    • B. 

      0.77

    • C. 

      0.16875

    • D. 

      13.23

  • 15. 
    Which of the following correctly relates the two equilibrium constant for two reaction shown. .. (NOCl-------->NO +1/2 Cl2) K1. (2No+Cl2 -------> 2Nocl ) K2
    • A. 

      K2=K1

    • B. 

      K2=1/(K1)2

    • C. 

      K2=K1

    • D. 

      None

  • 16. 
    Which of the following compounds doesn’t show buffer:
    • A. 

      NH3 / NH+4

    • B. 

      HCO-3 / H2CO3

    • C. 

      NaOH / OH-

    • D. 

      None

  • 17. 
    At freezing point of water 0c0 when Kw = 1.2*10-15 , calculate [H+] and [OH-] for natural solution:
    • A. 

      1.2*10-15

    • B. 

      3.46*10-8

    • C. 

      2.6*10-7

    • D. 

      None

  • 18. 
    Calculate PH if [OH] = 1.9*10 -6
    • A. 

      5.72

    • B. 

      8.28

    • C. 

      5.26

    • D. 

      None

  • 19. 
    Calculate Ka of NH4+ (Kb of NH3= 1.8*10-5)
    • A. 

      10-4

    • B. 

      5.6*10-10

    • C. 

      1.8*10-7

    • D. 

      2*10-3

  • 20. 
    The mixture formed by adding 10 ml of .1 M HBr with 20 ml of .2 M HCl , calculate PH :
    • A. 

      0.1666

    • B. 

      0.778

    • C. 

      0.13

    • D. 

      0.114

  • 21. 
    Classify each salt into (acidic, basic, natural) respectively: ( Nacl , CH3NH3Br , CH3COONa )
    • A. 

      Natural, acidic, basic

    • B. 

      Acidic, basic, natural

    • C. 

      Natural, basic, acidic

    • D. 

      None

  • 22. 
    How many moles of NH4Cl must be added to 2 L of .1 M NH3 to form a buffer solution of PH=9 (Kb NH3= 1.8*10-5)?
    • A. 

      9.25

    • B. 

      0.18

    • C. 

      0.36

    • D. 

      0.22

  • 23. 
    Calculate PH of .3 M NH3 and .36 NH4Cl , what is PH after adding 80 ml of buffer solution PKa = 9.25 (respectively)
    • A. 

      9.17 / 9.20

    • B. 

      9.20 / 9.17

    • C. 

      2.70 / 2.9

    • D. 

      None

  • 24. 
    We have the following equilibrium (2SO3 -------> 2SO2 + O2 ) what will happen to [SO3] if the temperature is increased:
    • A. 

      Increase

    • B. 

      Decrease

    • C. 

      Not change

    • D. 

      Cannot tell

  • 25. 
    PCl5 ---> PCl3 + Cl2 if Kc =.497 if the initial concentration of PCl5 = 1.66, calculate equilibrium concentration for (PCl5 / PCl3 / Cl2) (respectively):
    • A. 

      0.96 / 0.69 / 0.69

    • B. 

      0.69 / 0.69 /0 .69

    • C. 

      0.69 / 0.97 /0 .97

    • D. 

      None

  • 26. 
    Calculate PH if 1.52g of HNO3 (mm=63) in 575 ml:
    • A. 

      0.042

    • B. 

      1.38

    • C. 

      1.333

    • D. 

      1.45

  • 27. 
    The Kc of the following reaction is ( pbcl2 (s) -----> pb+2 (aq)+ 2cl-(aq) )
    • A. 

      Kc = [cl-] [pb+2] /[pbcl2]

    • B. 

      Kc = [cl-] [pb+2]

    • C. 

      None

  • 28. 
    If PH =2.9 and Ka= 1.8*10-5 calculate [HA]
    • A. 

      1.26

    • B. 

      0.88

    • C. 

      1.88

    • D. 

      1.78

  • 29. 
    Which of the following statment is true? 
    • A. 

      -Heat is given off to the surrounding in  an Endothermic process

    • B. 

      -/\H is always nigative in Exothermic process

    • C. 

      -work must be positive  in an  exothermic pricess

    • D. 

      - Heat is gained by the system in an endothermic process .

  • 30. 
    A particular chemical reaction involves a single reactant. What is the order of the reaction if the rate increases by a factor of eight when the concentration of the reactant is doubled? 
    • A. 

      1st order

    • B. 

      2nd order

    • C. 

      3rd order

    • D. 

      Zero order