Why do reactions either give out or absorb heat?
1 mark · EasyWhat must occur to the bonds in a molecule for a reaction to absorb heat from the surroundings?
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
Bonds must be broken.
Also accept: Bonds are broken; Break bonds; Bond breaking
Common mistakes: Bonds are made
Show mark scheme and worked solution
Marking points
B1 · 1 mark · States that bonds are broken (or equivalent).
Worked solution
Bonds must be broken to absorb energy.