5.11 Spontaneous Reactions Quiz

When the energy of the products is greater than the energy of the reactants, what is true about the reaction? It releases heat. It does work. It is spontaneous. It absorbs heat.

It absorbs heat.

What is true of spontaneous reactions when thinking about chemical systems? Products may take many years to form. They favor the formation of reactants. All reactions are all easily and substantially reversible. Reactions are always independent of temperature.

Products may take many years to form.

What is true of spontaneous reactions? They are instantaneous. They are indicated by a negative change in Gibbs free energy. They have a positive value of ΔS . They always release heat.

They are indicated by a negative change in Gibbs free energy.

What does a positive change in the Gibbs free-energy value represent?

a nonspontaneous reaction

What is the equivalent of a change in Gibbs free energy?

ΔH −TΔS