6: Energy level diagrams and bond energies

State whether ice melting is an exothermic or endothermic reaction and why.

* Endothermic
* In ice, forces of attraction hold water molecules tight
* When energy is transferred to ice, forces are disrupted
* Water molecules move out of their arrangement and ice melts

How are exothermic values written and how are endothermic values written?

* exothermic - negative values
* endothermic - positive values

Explain the bond making and breaking process in the reaction between nitrogen and oxygen.

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