entropy and energy
The first of two factors that determine whether a reaction is spontaneous or non-spontaneous is entropy. The second is energy. For a reaction to be spontaneous, it must have both of these factors.
No, an exothermic reaction is not always spontaneous. The spontaneity of a reaction depends on factors such as temperature, pressure, and the entropy change of the system.
The non-spontaneous reaction between substances d and e can be influenced by factors such as temperature, pressure, concentration of reactants, and the presence of catalysts. These factors can affect the rate and direction of the reaction, making it more or less likely to occur.
To determine if the reaction ( \text{Ni}_2\text{S}_2 \rightarrow 2\text{NiS} ) is spontaneous, we would need to consider the Gibbs free energy change (( \Delta G )) for the reaction. If ( \Delta G < 0 ), the reaction is spontaneous. Factors such as temperature, pressure, and the enthalpy and entropy changes of the system also play a crucial role in this assessment. Without specific thermodynamic data, it's not possible to definitively state the spontaneity of the reaction.
Use the following equation: delta G = delta H - T*deltaS. A reaction is spontaneous if delta G is negative. A reaction will always be spontaneous (under any temperature) only if the change in enthalpy (delta H) is negative and the change in entropy (delta S) is positive. If this is not the case, the reaction will only be spontaneous (negative delta G) for a range of temperatures (or could be always non-spontaneous)
Not B
Increasing the temperature makes a reaction spontaneous in some situations.
Enthalpy and entropy.
A reaction that occurs without the addition of heat is called a spontaneous reaction. These reactions can proceed at room temperature and may release energy in the form of light or sound. Examples include certain chemical reactions, such as rusting or combustion, and physical processes like phase changes. Spontaneous reactions are driven by factors such as changes in enthalpy or entropy.
Whether or not a reaction occurs is governed by its Gibbs free energy, or spontaneity. We will refer to this as ∆G. When ∆G is less than 0, the reaction is spontaneous and hence it will occur. On the other hand, when ∆G is more than 0, the reaction is not spontaneous and will not take place. ∆G is governed by several factors: 1) ∆H - the enthalpy of the reaction. This is what you mean by reactions that release energy. These energy-releasing reactions are termed as "exothermic reactions". 2) ∆S - the entropy of the reaction. 3) T - the temperature. They are inter-related with the formula: ∆G = ∆H - T*∆S Therefore, the enthalpy of a reaction cannot determine its spontaneity as there are other factors (∆S and T) to consider as well. You also have to take note of activation energy barriers that have to be overcome before a reaction can take place! I hope this was helpful! :)
The equilibrium position in a chemical reaction is determined by factors such as temperature, pressure, and the concentrations of reactants and products. These factors influence the balance between the forward and reverse reactions, ultimately determining where the reaction reaches equilibrium.
To determine if no reaction will occur, you can check if the reactants are in their most stable form and if they have enough energy to overcome the activation energy barrier. Additionally, you can consider factors such as temperature, concentration, and catalysts that may affect the reaction.