1.4 Bond Energies Flashcards
What is meant by the term ‘bond energy’?
The amount of energy required to break one mole of a particular covalent bond
Is bond breaking an exothermic or endothermic reaction?
Exothermic
Is bond formation an exothermic or endothermic process?
Exothermic
In ______________ reactions, the energy used to break bonds is greater than the energy released by forming new bonds
endothermic
In ______________ reactions, the energy released by forming bonds is greater than the energy used to break them
exothermic
How do you know if a chemical reaction is endothermic or exothermic?
- You add up the energy it takes for the bonds on the reactants side to break, and you do the same for the products side
- Then, you do the reactants - products. If you get a minus, its exothermic
During a chemical reaction, what three things happen?
- The bonds of the reactant molecules are broken
- The atoms rearrange themselves
- The bonds of the product molecules are formed
How do you calculate the overall energy change for a reaction?
overall energy change = energy required to break bonds - energy released by forming bonds