Chapter 7-HW Chem 2A
For a chemical reaction to occur all of the following must happen except
A large enough number of collisions must occur
A process which is unfavorable with respect to enthalpy, but favorable with respect to entropy,
Could occur at high temperatures but not at lower temperatures
A reaction which is unfavorable with respect to entropy but favorable with respect to enthalpy
Could occur at low temperatures but not at higher temperatures
Which process is not likely to be considered reversible?
Cutting down a tree
All of the statements concerning free energy and spontaneity are true except
Enthalpy and entropy are of equal importance in determining the spontaneity of a reaction.
The concept of free energy allows prediction of spontaneity of a process by considering the changes in _____and______ during the process.
Enthalpy: entropy
A rapid reaction is distinguished by
Having a small value of activation energy
All of the statements regarding ΔG are true except
It allows us to identify an exothermic reaction
All of the statements regarding the symbol ΔH are correct except
It can be called entropy change
To simplify comparisons, the energy value of fuels is expressed in units of
Kcal/g
In the process of dissolving sugar in water, the entropy increases. This means that the sign of ΔS is ____, and that the randomness of the system_____.
Positive; increases
Activation energy can be best described as
The difference in energy between reactants and the maximum energy
When a reaction system is at equilibrium
The rates of the reaction in the forward and reverse directions are exactly equal
All of the statements are true for spontaneous reactions except
The reaction rate is determined by the value ΔG
Reaction rates are determined by all of the following factors except
The spontaneity of the reaction
A process or reaction which releases heat to the surroundings is said to be
exothermic
A reaction that is spontaneous can be described as
proceeding without external influence once it has begun
