Studied by 1 person
What is enthalpy (H)?
Enthalpy is the total heat content of a system, a measure of the energy stored in a substance.
What does the symbol ΔH represent?
ΔH represents the change in enthalpy during a chemical reaction.
What is an exothermic reaction?
An exothermic reaction is a process that releases heat, resulting in a negative ΔH.
What is an endothermic reaction?
An endothermic reaction is a process that absorbs heat, resulting in a positive ΔH.
How is bond enthalpy defined?
Bond enthalpy is the amount of energy required to break one mole of a specific bond in a molecule.
What is the relationship between bond forming and enthalpy?
Bond formation releases energy, contributing to a decrease in enthalpy.
What does a positive ΔH indicate about a reaction?
A positive ΔH indicates that the reaction absorbs energy, characterizing an endothermic process.
What does a negative ΔH indicate about a reaction?
A negative ΔH indicates that the reaction releases energy, characterizing an exothermic process.
What is the standard enthalpy of formation?
It is the change in enthalpy when one mole of a compound is formed from its elements in their standard states.
How can the enthalpy change of a reaction be calculated?
It can be calculated using the formula: ΔH = Σ(bond enthalpies of bonds broken) - Σ(bond enthalpies of bonds formed).
