Molecules rearrange and form new molecules reversible

2. simultaneous decomposition and synthesis exchange

3. bonds broken and elements released synthesis

4. molecules formed from components decomposition

1. Molecules rearrange and form new molecules - exchange (they exchange some material in order to produce new things)
2. simultaneous decomposition and synthesis - reversible (it can go back)
3. bonds broken and elements released - decomposition
4. molecules formed from components - synthesis (these components merge and create molecules)

Wish i knew this to !