Reactivity 1.2—Energy cycles in reactions Flashcards
1
Q
Which (Bond-breaking/bond-forming) does which (absorbs/releases energy) ?
A
Bond-breaking absorbs and bond-forming releases energy.
2
Q
How should you calculate the enthalpy change of a reaction from given average bond enthalpy data?
A
lok at the bonds broken and the bonds made on each side of the equation and add up the total for each side then do bonds broken - bonds made
3
Q
What is the relationship between bond strength and bond enthalpy?
A
the stronger the bond, the higher the bond enthalpy because it will take more energy to break bonds
4
Q
What is Hess’s law?
Apply Hess’s law to calculate enthalpy changes in multistep reactions.
A
Hess’s law states that the enthalpy change for a reaction is independent of the pathway between the initial and final states.
