Solutions and Mixtures Jeopardy by hcj

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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
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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