Two Basic Drives (HSC SSCE Chemistry): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What can calculations about reaction spontaneity definitively determine?
What can calculations about reaction spontaneity definitively determine?
The reaction will not occur at all
Why are exothermic reactions much more common than endothermic ones?
Why are exothermic reactions much more common than endothermic ones?
They follow the energy drive to lower energy
What does entropy () measure in a substance?
What does entropy () measure in a substance?
The amount of randomness or disorder
For any given substance, how does entropy change with state?
For any given substance, how does entropy change with state?
Solid < Liquid < Gas
Which everyday observation demonstrates the entropy drive?
Which everyday observation demonstrates the entropy drive?
Mixed gases never spontaneously separate
For , what is ?
For , what is ?
Negative (4 moles gas → 2 moles gas)
If the energy drive is forward (releases energy), what is the sign of ?
If the energy drive is forward (releases energy), what is the sign of ?
Negative (exothermic)
When both energy and entropy drives point forward, does the reaction occur?
When both energy and entropy drives point forward, does the reaction occur?
Yes, always occurs spontaneously
When drives oppose each other, what determines if the reaction proceeds?
When drives oppose each other, what determines if the reaction proceeds?
The larger drive determines spontaneity
What happens to entropy when a solid dissolves in a solvent?
What happens to entropy when a solid dissolves in a solvent?
Entropy increases