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Chem 162 exam (1
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Exam of 7 pages for the course CAA201 - Test 3. at CAA201 - Test 3. (Chem 162 exam (1)
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Chem 162 examexothermic reaction - CORRECT ANSWER-a chemical reaction that releases
energy to its surroundings
"Heat" is best described as - CORRECT ANSWER-the energy transferred as a
result of a temperature difference
endothermic reaction - CORRECT ANSWER-A reaction that ABSORBS energy
in the form of heat
Iodine Vapor depositing on a cool surface - CORRECT ANSWER-exothermic
water condensing on a cold glass - CORRECT ANSWER-exothermic
propane burning - CORRECT ANSWER-exothermic
dry ice subliming - CORRECT ANSWER-physical, endothermic reaction
water freezing - CORRECT ANSWER-exothermic reaction
What is the term used to describe energy released when chemical bonds form? -
CORRECT ANSWER-potential energy
an endothermic reaction - CORRECT ANSWER-transfer of energy from
surroundings to system
what is unique about a state function
- the value of a state function depends on how change occurs
- the value of a state function depends only on final and initial values
- state function is another term for the internal energy of a system
- the value of a state function depends on the history of the system - CORRECT
ANSWER-the value of a state function depends only on final and initial values
state function - CORRECT ANSWER-A function that depends only on the initial
and final states of a system, not on the path in between.
, work - CORRECT ANSWER--P delta V
the horizontal part of heating curve indicates:
- the mass of material is irrelivant
the energy being added is being used to overcome intermolecular forces
there is no net energy change during phase changes
the material can no longer fain energy
the temperature is rising - CORRECT ANSWER-there is no net energy change
during phase changes
solid to gas is called - CORRECT ANSWER-sublimation
liquid to gas is called - CORRECT ANSWER-evaporation
liquid to solid is called - CORRECT ANSWER-freezing
solid to liquid - CORRECT ANSWER-melting
given = masses of each, same T initial and same amount energy lost, which will
end with the lowest temperature?
highest or lowest Cp (specific heat) - CORRECT ANSWER-A copper pot (lowest
specific heat (Cp)
which species has a standard enthalpy of formation of zero (delta H of f degrees)
- C (s, diamond)
- NaCl (s)
- H2 (g)
- Br (l)
- Al2 (s) - CORRECT ANSWER-H2 (g)
which of the following ways is not a way to calculate enthalpy of a reaction?
using enthalpies of formation
the temperature change of a reaction is the enthalpy of reaction
the using a calorimeter to determine q cal, relate that. to q run and then delta h
rxn
apply hess law using a series of known enthalpy of reactions to achieve an
overall enthalpy of reaction
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