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Chem 116 Exam with Questions & Correct Verified Answers
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Chem 116 Exam with Questions &Correct Verified Answers
Bronsted-Lowry acid - ✔✔acts as a proton donor
Bronsted-Lowry base - ✔✔acts a proton acceptor
1st law of thermodynamics (Law of Conservation of Energy) - ✔✔energy cannot be
created or destroyed in a chemical reaction
2nd law of thermodynamics - ✔✔entropy of any isolated system not in thermal
equilibrium almost always increases
3rd law of thermodynamics - ✔✔entropy of a pure crystalline substance is zero at
absolute zero
What is false about entropy and chemical reactions? - ✔✔an exothermic reaction can
be non-spontaneous if there is an increase in entropy in the formation of products
What is true about entropy and chemical reactions? - ✔✔-an endothermic reaction can be
spontaneous as long as there is an increase in entropy in the formation of products
-greater the number of micro states of a system, the higher the entropy for that system
-all other parameters being equal, a molecule of higher molar masses will have more entropy
compared to a molecule of lower molar masses
-the entropy of a substance in the gas state is much higher than entropies for the substance in
the liquid or solid state
, True for chemical reaction that is spontaneous at any temperature - ✔✔Change of G < 0
Change of H < 0
Change of S > 0
What is the relationship between Change of Gnot for a chemical reaction and the rate at which
it occurs? - ✔✔There is no relationship between change of G and the rate of a chemical
reaction.
What condition applies to an electrolytic cell? - ✔✔Enot cell < 0
Gnot > 0
K<1
What is false about chemical reactions? - ✔✔-a chemical reaction must be exothermic to
be spontaneous
-an exothermic chemical reaction occurring in a flask will cause a decrease in entropy of the
surrounding gas molecules
-a chemical that consumes more moles of gas than it produces will have an increase
(positive change) in entropy
-an endothermic chemical reaction must have a decrease in entropy to be spontaneous
What is true about chemical reactions? - ✔✔a chemical reaction that is not spontaneous
in one direction at all temperatures will be spontaneous at all temperatures in the reverse
direction
What is false for the relationship between a chemical reaction equilibrium and Change in G for
the chemical reaction - ✔✔-if change in G > 0 the equilibrium will favor reactants
-if change in G < 0 the reaction will reach equilibrium quickly
-at equilibrium, change in G can be positive or negative depending on the temperature
-the sign of change in G determines which direction a reaction will proceed to reach equilibrium
if starting from standard conditions
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