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

Answer :

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)
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

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