Thermochemistry
4 years ago
mmassey
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15 QuestionsShow answers
  • Question 1
    30 seconds
    Q. In an exothermic process the surrounding looses heat. 
    answer choices
    True
    False
  • Question 2
    180 seconds
    Q. In an endothermic reaction the system is releasing energy.
    answer choices
    True
    False
  • Question 3
    120 seconds
    Q. Is the combustion of gasoline endothermic or exothermic?
    answer choices
    Endothermic
    Exothermic
  • Question 4
    120 seconds
    Q. As someone is running on the track they begin to perspire.  If the runner is our system, are they endothermic or exothermic?
    answer choices
    Endothermic process
    Exothermic process
  • Question 5
    180 seconds
    Q. A reaction is performed in a beaker with a temperature probe recording the temperature changes of the reaction.  If the temperature began at 15.0 degrees Celsius and ended at 27.5 degrees Celsius.  If the reaction is our system, is the system endothermic or exothermic?
    answer choices
    Exothermic
    Endothermic
  • Question 6
    300 seconds
    Q. Refer the the following question:
    2N2 + 3H2 --> 2NH3 + 46 kJ
    How much energy would be produced if only 1 mol of nitrogen was reacted?
    answer choices
    92 kJ
    0.143 kJ
    23 kJ
    15 kJ
  • Question 7
    300 seconds
    Q. How much energy must be used to produce 4.75 mol of gaseous water?
    H2O (l) +  44.0 kJ --> H2O (g)
    answer choices
    207 kJ
    9.36 kJ
    206.8 kJ
    9.362 kJ
  • Question 8
    900 seconds
    Q. What mass of P4 must be reacted to produce 5905 kJ of energy?
    P4 + 6Cl2 --> 4PCl3 + 2439 kJ
    answer choices
    25.43 g
    563.0 g
    2.421 g
    300.0 g
  • Question 9
    120 seconds
    Q. Do reactants in an endothermic reaction have a higher or lower energy than the products? 
    answer choices
    Higher
    Lower
  • Question 10
    120 seconds
    Q. Do the reactants in an exothermic reaction have a higher or lower energy than the products?
    answer choices
    Higher
    Lower
  • Question 11
    300 seconds
    Q. 4 PCl5 + 3438 kJ --> P4 + 10 Cl2
    How much energy is required to produce each mole of chlorine?
    answer choices
    687.6 kJ
    859.5 kJ
    343.8 kJ
    245.8 kJ
  • Question 12
    300 seconds
    Q. In a laboratory experiment a student was using Styrofoam cups and foil to reduce the energy lost during an exothermic reaction.  The reaction constantly had a temperature probe in it.  Towards the end of the reaction the student noticed the temperature in the cups was going down (opposite what they thought is should).  The student concluded that the energy was destroyed within the system.  This student's reasoning violates what law?
    answer choices
    Law of Conservation of Mass
    Law of Enthalpy
    First Law of Thermodynamics
    Law of Heat Transfer
  • Question 13
    60 seconds
    Q.

    During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______.

    answer choices

    Warm

    Cold

    Bubbly

    Damp

  • Question 14
    60 seconds
    Q. H2 + Cl2 --> 2 HCl + 1845 kJ
    Is this reaction endothermic or exothermic?
    answer choices
    Endothermic 
    Exothermic
  • Question 15
    60 seconds
    Q. H2 + 2 C + N+ 270.3 kJ --> 2 HCN
    Is this reaction endothermic or exothermic?
    answer choices
    Endothermic 
    Exothermic
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