Bond Enthalpy

What is the definition of exothermic reactions ?

Reactions when the products have less energy than the reactant energy is given out to the surrounds ( temp goes up )

What is the definition of endothermic reaction ?

Reaction when the products have more energy than the reactant energy is taken in from the surroundings ( temp goes down )

Draw enthalpy level diagram of a exothermic and endothermic reaction

Draw the enthalpy level diagram of combustion of sulfur to form sulfur dioxide ?

Average bond enthalpy

Is the average enthalpy change that takes place when breaking (by homolytic fission) 1 mol of a given type of bond in the molecules of gaseous species

What does bond enthalpies do? (Energy)

The every that takes to break or make a particular bond we can work out the overall enthalpy / energy change for the reaction

What is the equation for energy change

Sum of bond broken - sum of bond made

Is bond broken endo or exothermic reaction

Endothermic reaction

Is bond making endo Or exothermic reaction

Exothermic reaction

What does homolytic reaction means

The electrons are shared out equally making free radical

What does heterolytic fission mean

Both electrons se shared or transfer to one elements making ion

Why does using the energy change method to calculate the 🔺 H valves may not always be accurate

Will be less accurate than using formation or combustion data because the bond energies are slightly different depending on the compound the bond is found in