Bond energy calculations

Question 1

how do you know how if reactions are exothermic due to bond energy calculations

Answer 1

• in some reactions, the energy released when new bonds form is more energy than the energy needed to break the bonds in the reactants
• these reactions transfer more energy up the surrounding

Question 2

how do you know how if reactions are endothermic due to bond energy calculations

Answer 2

• in some reactions, the energy realised when new bonds form is less than the energy needed to break bonds in the reactant
• these transfer energy from surrounding go the reacting chemicals

Question 3

how do you calculate energy change in reactions

Answer 3

to calculate energy change in a reaction , you need to work out the how much energy is needed to break the bonds in the reactants

Question 4

what is bond energy

Answer 4

energy needed to break the bond between two atoms

Question 5

the energy is the same for the energy required to break the bond and…

Answer 5

the same for the amount released when the bond is formed

Question 6

if the energy for the products is more, the reaction is…

Answer 6

exothermic, therefore the overall energy change is negative

Question 7

if the energy for the products is less, the reaction is…

Answer 7

the reaction is endothermic, therefore the overall energy change is positive