Science Quiz [ Mr, Shokir ]

16 Questions | Total Attempts: 85

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Science Quiz [ Mr, Shokir ]

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Questions and Answers
  • 1. 
    Which one of the following substances has the higher specific heat ? ........... 
    • A. 

      1 g of water 

    • B. 

      1 g of iron 

    • C. 

      1 g of Alumnium 

    • D. 

      1 g of mercury 

  • 2. 
    If the temperature of a substance is doubled , its specific heat will be .............. 
    • A. 

      Decreased to half 

    • B. 

      Constant 

    • C. 

      Increased to double 

    • D. 

      Increased to four times 

  • 3. 
    If the two bodies have the same mass , gain the same amount of heat , the raise in the temperature of the second body is double that of the first , therefore the specific heat of the second body is ............ the first one. 
    • A. 

      Equal to 

    • B. 

      Double 

    • C. 

      Half

    • D. 

      Quarter 

  • 4. 
    The following is a list of specific heat capacities for a few metals :  C copper = 0.385 , C iron = 0.444 , C silver = 0.240 , C aluminum = 0.900  50 g of sample on an unknown metal is heated with 800 joules , if the temperature of the metal increases by 41.6 C , What is the identity of the unknown metal ? ................ 
    • A. 

      Copper 

    • B. 

      Silver 

    • C. 

      Alumnium 

    • D. 

      Iron 

  • 5. 
    Using the quantity of heat equation , what would the formula look like if we were calculating the change in temperature ? ........ 
    • A. 

      Qp.m=Δ T.c  

    • B. 

      Qp/m.c=Δ T

    • C. 

      Qp.m/c=Δ T

    • D. 

      Qp.c.m=Δ T

  • 6. 
    The (+ ve) sign which precedes the Δ H value , indicates that the enthalpy of products is ............ that of reactants 
    • A. 

      Larger than 

    • B. 

      Equal 

    • C. 

      Lower than 

    • D. 

      Constant 

  • 7. 
    If the heat content of products is lower than that of reactants , thus the reaction ........... 
    • A. 

      Is endothermic 

    • B. 

      Is exothermic 

    • C. 

      Whose Δ H value has a positive sign 

    • D. 

      Whose Δ H value = zero 

  • 8. 
    Dissolving process is called hydration when the solvent is .......... 
    • A. 

      Benzene 

    • B. 

      Oil

    • C. 

      Alcohol

    • D. 

      Water 

  • 9. 
    In the following thermochemical equation :  The heat change accompanied with this process is called ............... heat 
    • A. 

      Formation

    • B. 

      Combustion

    • C. 

      Dissolving

    • D. 

      Neutralization 

  • 10. 
    What is the change in Enthalpy on dissolving 40 g of NaOH in water to form one liter of solution , knowing  that the temperature raised by 10.6 C  ? .............kJ/mol [ NaOH = 40 g/mol ]
    • A. 

      -0.443

    • B. 

      -4.4308

    • C. 

      -44.308

    • D. 

      -443

  • 11. 
    Which of the following remains constant in the closed system ? ....... 
    • A. 

      Energy 

    • B. 

      Mass

    • C. 

      Temperature 

    • D. 

      Enthalpy 

  • 12. 
    In the reaction :  
    • A. 

      Negative , because the reaction is endothermic 

    • B. 

      Positive , because the reaction is endothermic 

    • C. 

      Negative , because the reaction is exothermic 

    • D. 

      Positive m because the reaction is exothermic 

  • 13. 
    Anhydrous copper II chloride reacts with water to form hydrous copper II chloride , according to the equation : 
    • A. 

      -1586 kJ/mol

    • B. 

      316 kJ/mol

    • C. 

      -110 kJ/mol

    • D. 

      -30 kJ/ mol

  • 14. 
    Calculate :  
  • 15. 
    Calculate the heat quantity in - kJ - required to raise the temperature of 48.7 g of water from 22.8 C to 62 C 
  • 16. 
    Calculate the heat quantity in - kJ - required to raise the temperature of 48.7 g of water from 22.8 C to 62 C 
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