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Solutions and Mixtures Jeopardy

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					Thermochemistry
    Jeopardy
xx
This is the equation used to
 calculate the heat capacity
         of an object.
What is C = c x m?
This is the definition of
 specific heat capacity.
 What is the amount of
energy required to change
one gram of a substance by
   one degree Celsius?
This is the substance on the
   specific heat capacities
  table that would require
 the most heat to increase
  its temperature by 10  oC.
What is hydrogen?
This is the definition of   DH f
                              o.
What is the enthalpy change
   when one mole of a
 compound is formed from
        its elements?
This is the definition of a
       closed system.
 What is a system that is
closed to materials but not
        to energy?
Changing the phase of a
compound is a change in
  this type of energy.
What is potential energy?
A change between these
   two phases has the
    greatest change in
        enthalpy.
What is liquid to gas.
This type of curve shows the
   temperature and phase
      changes involved in
  changing a gas to a solid.
What is a cooling curve?
This is the number of steps
      that are involved in
 calculating the heat change
 in going from water vapour
    at 100 oC to ice at -5oC.
What is 4 steps?
This is the amount of heat
 required to convert 500 g
 of water at 10oC to water

           vapour.
What is 1319 kJ?
Calorimeters are useful for
    measuring enthalpy
changes because they form
    this type of system.
What is an isolated system?
This is the heat given off when
   a food sample undergoes
     combustion in a bomb
   calorimeter (calibrated to
      3.09 kJ/oC) and has a

 temperature change of 75    oC.
 What is 232 kJ of heat
released by the sample?
These are two situations
when a calorimeter is not
 practical for measuring
    enthalpy change.
          What are
  non-aqueous solutions,
    reactions that form a
significant amount of heat or
reactions that are very slow?
These three assumptions
  must be made when
measuring enthalpy change
   using a calorimeter.
What is the system is isolated,
 the heat exchange with the
calorimeter are negligible and
   the properties of water
      remain the same?
 A 70.0 g sample of a piece of
  metal was heated to 95   oC and

then placed in 100 g of water in a
calorimeter. The water increasing
  in temperature from 20oC to
  22oC. This is the specific heat
      capacity of the metal.
What is 0.176   J/goC?
A reaction with a negative
    enthalpy change is
     described as this.
What exothermic?
  This law states that the
enthalpy change of a process
 depends only on the initial
and end conditions (pathway
      doesn’t matter).
What is Hess`s Law?
The change in enthalpy of
 these are defined as zero.
What are elements in their
     standard states?
Using these to determine
enthalpy change is only an
        estimate.
What are bond energies?
To ensure a spontaneous
 reaction in going from a
solid to a liquid, a reaction
  must have this sign for
          enthalpy.
What is negative?
Catalysts increase reaction
 rates by decreasing this.
What is the activation
       energy?
This is the slowest step in a
    reaction mechanism.
What is the rate determining
            step?
According to Le Chatelier’s
  Principle, these are the
 stresses that can cause a
    shift in equilibrium.
What are temperature,
  concentration and
      pressure?
An elementary step which
 involves a single molecule
 as a reactant is called this
      type of reaction.
What is unimolecular?
These are formed during the
      transition state of a
 reaction (part way between
   a reactant and product).
What are activated
   complexes?
Using bond energies, this is
   the estimated enthalpy
 change for the combustion
        of methane.
What is -710 kJ?

				
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posted:1/6/2013
language:English
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