C7.4 Bond energy calculations Flashcards
1
Q
What is the bond energy?
A
➢ The energy needed to break the bond between two atoms
2
Q
What is bond energy measure in ?
A
➢ KJ/mol
3
Q
What do you need to work out in order to find the overall energy change of a reaction?
A
➢ How much energy is needed to break the chemical bonds in the reactants
➢ How much energy is released when the new bonds are formed in the products
4
Q
How do you find the overall energy change of a reaction?
A
➢ Reactants - products
5
Q
What would be a positive sign if it is an exothermic reaction?
A
➢ negative overall energy change
6
Q
What would be a positive sign if a reaction was endothermic?
A
➢ Positive overall energy change
