Here's why:
* Chemical reaction: A process where atoms rearrange to form new substances.
* Synthesis reaction: A type of chemical reaction where two or more substances combine to form a single, more complex substance.
In this case, hydrogen (H₂) and oxygen (O₂) combine to form water (H₂O).
![Vapor-Induced Liquid–Solid Phase Switching in Macrocyclic Pillar[6]arene Systems](https://www.scienceaq.com/article/uploadfiles/202110/2021102312252778_S.jpg)
