level: 6.5 Bond energies and enthalpy changes
Questions and Answers List
level questions: 6.5 Bond energies and enthalpy changes
| Question | Answer |
|---|---|
| Bond breaking is (endo/exo) thermic | endothermic |
| Bond making is (endo/exo) thermic | exothermic |
| Bond energy requires energy, why? | Energy is needed to overcome the attractive forces joining the atoms together |
| In a chemical reaction if the energy needed to break bonds is less than the energy released when new bonds are formed. What happens | The reaction will release energy and is exothermic |
| In a chemical reaction if the energy needed to break bonds is more than energy released when new bonds are formed. What happens? | The reaction will absorb energy and is exothermic |
| What is dissociation energy and exact bond energy? | amount of energy needed to break a specific covalent bond |
| What is the symbol for bond energy | E |
| Bond energy is affected by what | Bond energy is affected by other atoms in the molecule |