Senior One Task No5

15 Questions | Total Attempts: 82

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Senior One Task No5 - Quiz

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Questions and Answers
  • 1. 
    1. in the following reaction: 8Zn + S8 ------------ 8ZnS calculate: the mass of zinc sulphide which is resulted with an excess amount of zinc. (zn=65 , s=32 )
  • 2. 
    -calculate the volume of oxygen needed to produce 90 g of water by reacting with an excess amount of hydrogen at STP. (o=16 , H=1) 2H2 + O2 -------------------2H2O
  • 3. 
    1-all the neutralization reaction are considered as a combination between…………. To form H2O
    • A. 

      H+ and OH

    • B. 

      OH- and OH-

  • 4. 
    2- one mole of any substance contains …………molecules.
    • A. 

      6.02 x 1023

    • B. 

      6.02 x 10-23

  • 5. 
    3-the no. of atoms of 0.5 moles of sodium is ………………… atoms
    • A. 

      3.01 x 10power 23 ,

    • B. 

      6.02 x10power 23

  • 6. 
    1. which of the following, heat energy will be evolved?
    • A. 

      Dissolution of NH4Cl in water

    • B. 

      Burning of L.P.G.

  • 7. 
    Conservation of mass is obtained when total mass of reactants is equal to total mass of
    • A. 

      Molecules

    • B. 

      Products

  • 8. 
    the Molar volume At Stp is ………………approxemtailly
    • A. 

      22

    • B. 

      24

  • 9. 
    choose the suitable balance for the following Equation FeBr3 + H2SO4 ------- Fe2(SO4)3 + HBr
    • A. 

      2-3-1-6

    • B. 

      2-4-1-5

  • 10. 
    Calculate the molar mass of anhydrous copper sulphate CUSO4 . 5H2O is ................. nearstly  
    • A. 

      250

    • B. 

      200

  • 11. 
    the element which written in the reaction are written in form of …
    • A. 

      Symbol

    • B. 

      Compound

  • 12. 
    Calculate the number of molecules that are found in a sample of sulphur dioxide of mass 32 g [S=32 . O = 16]
    • A. 

      2NA

    • B. 

      HALF NA

  • 13. 
    molar mass of hydrogen gas is ……………………
    • A. 

      Mass of 6.02x1023molc

    • B. 

      Mass of 12.04x1023 atoms

    • C. 

      All

  • 14. 
    9-………law is states that : at constant temperature volume of gas is directly prop. With no. of moles.
    • A. 

      Avogadro's law

    • B. 

      Gases law

    • C. 

      Temperature law

  • 15. 
    Chemical change involves formation of
    • A. 

      New substances

    • B. 

      Salt

    • C. 

      Water

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