What type of reaction does this model represent? 1. single replacement
2. double replacement
3. Decomposition
4. double displacement

1. single replacement

Explanation:

Single replacement can be represented by AB+C ⇄B+AC, which matches the picture

Double replacement and double displacement are the same kind of reaction and can be represented by AB+CD ⇄BD+AC

Decomposition reaction can be represented by AB ⇄A+B

c is the answer because when something is left after something evaporates that shows the chemical change.