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When does heat equal enthalpy in a chemical reaction?
Heat equals enthalpy in a chemical reaction when the reaction is carried out at constant pressure.
What is the enthalpy change for the reverse reaction?
The enthalpy change for the reverse reaction is equal in magnitude but opposite in sign to the enthalpy change for the forward reaction.
What principle of chemistry states that if a chemical reaction occurs in stages then the heat of each step will equal the total heat of the reaction as if it had occurred in one step?
Hess's Law states that the total enthalpy change for a chemical reaction is the same regardless of the pathway taken to achieve the final products. This means that if a reaction occurs in multiple steps, the sum of the enthalpy changes for each step will equal the overall enthalpy change for the reaction.
How is Hess's law applied in calculating enthalpy?
All the reactions in a path are added together.
What is the Hess's law?
C - The enthalpy of reaction does not depend on the steps taken in the reaction. APEX --WXM--
When does heat equal enthalpy in a chemical reaction?
Heat equals enthalpy in a chemical reaction when the reaction is carried out at constant pressure.
What is the enthalpy change for the reverse reaction?
The enthalpy change for the reverse reaction is equal in magnitude but opposite in sign to the enthalpy change for the forward reaction.
What principle of chemistry states that if a chemical reaction occurs in stages then the heat of each step will equal the total heat of the reaction as if it had occurred in one step?
Hess's Law states that the total enthalpy change for a chemical reaction is the same regardless of the pathway taken to achieve the final products. This means that if a reaction occurs in multiple steps, the sum of the enthalpy changes for each step will equal the overall enthalpy change for the reaction.
How is Hess's law applied in calculating enthalpy?
All the reactions in a path are added together.
What is the Hess's law?
C - The enthalpy of reaction does not depend on the steps taken in the reaction. APEX --WXM--
How can an unknown deltaH reaction be determined using Hess's law?
By manipulating known reactions with known enthalpy changes to create a series of intermediate reactions that eventually add up to the desired reaction whose enthalpy change is unknown. By applying Hess's law, the sum of the enthalpy changes for the intermediate reactions will equal the enthalpy change of the desired reaction, allowing you to determine its enthalpy change.
Reaction is chemical change or physical?
Reaction is more often used for chemical change, but it is also used in the physics law, "For every action there is an equal and opposite reaction."
Is qrxn delta h of reaction under the same pressure?
Yes, ( q_{rxn} ) (the heat of reaction) is equal to the change in enthalpy (( \Delta H )) of the reaction when measured at constant pressure. This is because, under constant pressure conditions, the heat exchanged in a reaction corresponds directly to the change in enthalpy. Thus, ( q_{rxn} = \Delta H ) at constant pressure.
What are the rules of working with reaction enthalpies?
There are three specific laws to keep in mind when working with reaction enthalpies. They are: Î?H is directly proportional to the quantity of a substance that reacts or is produced by a reaction, Î?H for a reaction is equal in magnitude but opposite in sign to Î?H for the reverse reaction, and Î?H is independent of the number of steps involved.
When is heat of a reaction equal to the enthalpy change of the same reaction?
I'm pretty sure its when the pressure remains constant. When the pressure is constant: q=delta U + P delta V The equation for delta H is: delta H = delta U +P delta V Therefore, when pressure is constant: delta H = q I think...
What is the difference of enthalpy of formation and the enthalpy of combustion?
Enthalpy of combusion is energy change when reacting with oxygen. Enthalpy of formation is energy change when forming a compound. But some enthalpies can be equal.ex-Combusion of H2 and formation of H2O is equal
What is the relationship between adiabatic processes and the change in enthalpy (H)?
In adiabatic processes, there is no heat exchange with the surroundings, so the change in enthalpy (H) is equal to the change in internal energy (U). This means that in adiabatic processes, the change in enthalpy is solely determined by the change in internal energy.
