Question

how to remember chemical reactions ?

Answer 1

you have to put logic and understanding !! you cant remember them just like history
just write them and practice them what all reaction can take place and why certain molecules only formed !!!

Answer 2

There is A LOT, basically you don't remember them, but if you do then its good too. There's some technique to get out of remembering it, like
- Balancing equation with oxidation numbers
- Metals + Nonmetals = Ionic compound
- Nonmetal + Nonmetal = Covalent compound
- Acid + Base = Salt + Water

Answer 3

Very nice, @.Sam.