Energy change of Reactions Flashcards
1
Q
what is a bond energy
A
amount of energy needed to break 1 mole of a certain covalent bond
1
Q
when we break bonds what type of reaction is it
A
endothermic - takes energy in to break
2
Q
when we make new bonds what type of reaction is it
A
exothermic - releases energy to surroundings
3
Q
how do we calculate if a reaction is endo or exo thermic
A
work out the bonds that have been broken in the first (endothermic)
then work out the bonds that have been made (exothermic)
(endo - exo)
if answer is a - then it is exothermic
if answer is a + then endothermic
