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Do you know Thermo?

Quiz by Natalie Wieland

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15 questions
Show answers
  • Q1
    A hot object is placed into a beaker of cold water, which of the following is true...
    heat is transferred from the water to the object until the reach the same temperature
    heat is transferred from the object to the water until they reach the same temperature
    heat is transferred from the object to the water until their change in temperature is the same
    heat is transferred from the water to the object until their change in temperature is the same
    60s
  • Q2
    In the q = m C delta T equation, the m stands for
    molarity
    moles
    mass
    volume
    30s
  • Q3
    If you preform a chemical reaction, why/how do you get a q?
    because the two reactants are at different temperatures
    there is no q for a reaction
    you need more information
    because the reaction overall gains or loses energy from or to the surroundings
    60s
  • Q4
    How is q different than delta H?
    they are very different
    delta H is a heat energy ratio constant for a reaction, while q is heat energy specific for amounts reacted.
    They are the same
    delta H is an endothermic process, while q is an exothermic process
    60s
  • Q5
    If a student is doing a reaction in a test tube, and the test tube starts to feel cold, the reaction is...
    enthalpy
    you need more information
    exothermic
    endothermic
    60s
  • Q6
    For the reaction: 34kJ + N2 + 3H2 --> 2NH3, the reaction is
    exo with a delta H of -34kJ/mol
    endo with a delta H of -34 kJ/mol
    endo with a delta H of + 34kJ/mol
    exo with a delta H of +34 kJ/mol
    60s
  • Q7
    For the reaction, CH4 + 2O2 ---> CO2 + 2H2O the delta H is -50kJ/mol. If four moles of oxygen react, how much heat would be released?
    25 kJ
    50 kJ
    100 kJ
    you need more information to calculate
    60s
  • Q8
    For the reaction, CH4 + 2O2 --> CO2 + 2H2O the delta H is -50kJ/mol. If you want the reaction to produce 200 kJ of heat, how many moles of CH4 should you react with excess O2?
    2
    4
    1
    you need more information to calculate this
    60s
  • Q9
    If CH4 + 2O2 --> CO2 + 2H2O has a delta H of -50kJ/mol. What would be the delta H for this reaction: 3CO2 + 6 H2O --> 3CH4 + 6 O2
    + 150 kJ/mol
    +50
    - 150 kJ/mol
    you need more information to answer this
    60s
  • Q10
    For the reaction, N2(g) + 3H2(g) --> 2NH3(g), predict the sign of the delta S.
    positive
    need more information to solve this
    negative
    zero
    60s
  • Q11
    Which of the following values is zero for elements and diatomics
    entropy
    heat of formation
    entropy and heat of formation
    neither entropy nor heat of formation
    60s
  • Q12
    Nature favors
    negative delta S and positive delta H
    negative delta S and negative delta H
    positive delta S and positive delta H
    positive delta S and negative delta H
    60s
  • Q13
    For a reaction to be spontaneous, you need which sign
    negative delta G
    negative delta H
    positive delta S
    positive delta G
    60s
  • Q14
    A reaction has a positive delta H and a negative delta S, when will this reaction be spontaneous?
    at high temps
    never
    always
    at low temps
    60s
  • Q15
    A reaction has a delta H of +50.0 kJ/mol, a delta S of +130J/mol K. At 298 Kelvin, will this reaction be spontaneous?
    no, you have a negative delta G
    No, you have a positive delta G
    yes, you have a negative delta G
    yes, you have a positive delta G
    120s

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