Question

Molecules rearrange and form new molecules reversible

Answer 1

1. exchange- Molecules rearrange and form new molecules 
2. reversible- simultaneous decomposition and synthesis 
3. decomposition- bonds broken and elements released 
4. synthesis- molecules formed from components

Answer 2

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)