Căutare
Descoperă oameni noi, creează noi conexiuni și faceti-va noi prieteni
a chemical reaction between two compounds where the positive ion of one compound is exchanged with the positive ion of another compound
a chemical reaction between two compounds where the positive ion of one compound is exchanged with the positive ion of another compound
a chemical reaction between two compounds where the positive ion of one compound is exchanged with the positive ion of another compound