Exam (elaborations)
Chem midterm 3 (1).
Exam of 1 pages for the course nr360 at nr360 (Chem midterm 3 (1).)
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Chem midterm 3If a reaction is spontaneous and S system is < 0 what is S surroundings - CORRECT
ANSWER-S surr > 0
Oxidizing agent - CORRECT ANSWER-Gets reduced on reactant side
What is a good explanation showing why a precipitate would dissolve after shaking -
CORRECT ANSWER-There is a complex ion formed
How does a decrease in pressure affect entropy - CORRECT ANSWER-increases
What factor can change Ksp value - CORRECT ANSWER-temp
If you want a low pH, what does the buffer have to be composed of - CORRECT
ANSWER-weak acid and conj base
When does Ka = pH - CORRECT ANSWER-1/2 of the equivalence point
What can lead to an increase in microstates - CORRECT ANSWER-increase vol
Does dilution affect pH - CORRECT ANSWER-No
What is true of the anode in an electrolysis cell - CORRECT ANSWER-it attracts
negative ions
a reversible process - CORRECT ANSWER-can be reversed with no net change in
either system or surroundings
What is not a buffer - CORRECT ANSWER-strong acid and a salt
reducing agent - CORRECT ANSWER-gets reduced on product
Q<K - CORRECT ANSWER-rxn towards products (no precipitate)
Q=K - CORRECT ANSWER-equilibrium
Q>K - CORRECT ANSWER-Reactants (precipitate)
what is involved in calculating the entropy change of the surroundings? - CORRECT
ANSWER-The enthalpy change of the reaction.
When a voltaic cell is set-up under standard conditions it is - CORRECT
ANSWER-an irreversible thermodynamic process that is spontaneous
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