25 Questions
Which of the following is true about exothermic reactions?
They tend to be spontaneous
Which of the following is true about reactions that increase entropy?
They tend to be spontaneous
What does a negative ΔG indicate?
An exergonic reaction
What does a positive ΔG indicate?
A non-spontaneous reaction
When is a reaction at equilibrium?
When there is no net transfer of heat or energy
When is a reaction considered under non-standard conditions?
All of the above
How does the Gibbs free energy change when the reactants are increased compared to the products?
It becomes more negative
How does the Gibbs free energy change when the reactants are reduced compared to the products?
It becomes more positive
What is the rationale for why the body phosphorylates ATP as a source of energy currency?
ATP can be coupled to endergonic reactions
Do enzymes themselves drop the ΔG?
No
Which one of these is the definition of a closed system?
A system that exchanges energy, but not matter with the environment outside the system
Which one of these is the definition of an open system?
A system that exchanges energy and matter with the environment outside the system
According to the first law of thermodynamics, what happens to the total amount of energy in the universe during a chemical change?
It remains constant
What does the term 'enthalpy' refer to?
All of the above
How is the change in enthalpy (ΔH) measured in a chemical reaction?
By measuring the change in heat within the system
What is the ΔH value for an exothermic reaction?
Negative
What is the ΔH value for an endothermic reaction?
Positive
What is the ΔH value for an isothermic reaction?
Zero
According to the second law of thermodynamics, what happens to the total entropy of the universe?
It increases
What does an increase in entropy (S) indicate?
The energy in the system is more dispersed
A positive ΔH can sometimes will cause a spontaneus reaction if ΔS is...
A negative ΔS can sometimes cause a spontaneous reaction if ΔH is...
A reaction will never be spontaneous if...
If the [Products] is higher than the [Reactants] the reaction is less likely to be..
A reaction will always be spontaneous if...
Test your knowledge of thermodynamics and the definitions of open and closed systems with this quiz. Learn about the first law of thermodynamics and how it applies to chemical reactions.
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