Chapter 7-HW Chem 2A

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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


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