0
Temperature and energy are two of the variables included when graphing enthalpy and entropy. Enthalpy is made up of the energy, pressure, and volume of a system. Entropy is a way to determine the different ways energy can be arranged.
Wiki User
∙ 9y ago
Add your answer:
Earn +20 pts
Predict whether the changes in enthalpy entropy and free energy will be positive or negative for the freezing of water and explain your predictions How does temperature affect the spontaneity?
Enthalpy- positive Entropy- decreasing Free energy- negative
What are the units of enthalpy?
The units for entropy are joules per kelvin (J K-1)
How do you calculate melting points and boiling points by using enthalpy and entropy?
Cant
True or False A large positive value of entropy tends to favor products of a chemical reaction?
True, a large positive value of entropy tends to favor products of a chemical reaction. However, entropy can be offset by enthalpy; a large positive value of enthalpy tends to favor the reactants of a chemical reaction. The true measure to determine which side of a chemical reaction is favored is the change in Gibbs' free energy, which accounts for both entropy and enthalpy, as calculated by: Change in Gibbs = Change in Enthalpy - Temp in Kelvin * Change in Entropy A negative value of Gibbs free energy will always favour the products of a chemical reaction.
What value should the heat of the reaction have in a spontaneous reaction?
It can be + or - depending on the value of the entropy (∆S). Recall, that ∆G = ∆H - T∆S and for a spontaneous reaction, ∆G must be negative, so you can see how this will depend on the values and signs of both enthalpy and entropy.
What characteristics of a substance is NOT affected by enthalpy and entropy?
Pressure is not affected by enthalpy and entropy.pressure
Is Delta S is the change in enthalpy a measure of randomness?
No, delta s is the change in entropy. Delta H is the change in enthalpy, the amount of heat used in a system. Entropy and enthalpy are different, but closely related.
How is energy permantely lost?
To feed the rise in Entropy. Enthalpy is a constant, but Entropy is always increasing.
Is polymerization endothermic or exothermic?
Exothermic, because the reaction enthalpy must be negative. With polymerization, the entropy decreases. The Gibbs energy has to be negative. Thus negative reaction enthalpy. Gibbs energy = reaction enthalpy - temperature*entropy
What is the definition of enthalpy and entropy?
Enthalpy is the amount of energy released or used when kept at a constant pressure. Entropy refers to the unavailable energy within a system, which is also a measure of the problems within the system.
What factors generally determine whether a reaction happens or not?
Enthalpy and entropy.
What is the enthalpy and entropy change when ammonium chloride is dissolved in water?
The published value for an enthalpy change is 14.78 kJ/mol
Predict whether the changes in enthalpy entropy and free energy will be positive or negative for the freezing of water and explain your predictions How does temperature affect the spontaneity?
Enthalpy- positive Entropy- decreasing Free energy- negative
What kind of changes contribute to spontaneity?
An increase in entropy.
What could make G become negative at a given enthalpy and entropy?
Changing the temperature
What two basic tendencies in nature appear to influence reaction process?
enthalpy and entropy
What are the units of enthalpy?
The units for entropy are joules per kelvin (J K-1)
