video 2

Question 1

what is needed to break a covalent bond?

Answer 1

a lot of energy

Question 2

is breaking bonds endo or exothermic?

Answer 2

endothermic

Question 3

is the same amount of energy released for making a bond as it is for breaking a bond?

Answer 3

yes, it is the opposite process

Question 4

what does the bond enthalpy depend on?

Answer 4

linked to the strength of the bond

Question 5

what needs to be true to use bond enthalpies?

Answer 5

needs to be covalent

Question 6

what are the steps required to calculate the enthalpy change using bond enthalpies?

Answer 6

1. draw displayed formulae of all chemicals
2. add up all of the bonds in reactants
3. add up all of the bonds in products
4. subtract the energy released from energy required

Question 7

is energy required to form bonds?

Answer 7

no, energy is released