3 things that learned is one i learned what a mixture is.  It is 2 or more things mixed together and you can see all the subtances. Also i learned that an Acid is a compound that releases hydrogen ions in water.The last thing i learned was that a solution is a mixture of 2 or more things and you cant see all the particals.I loved the labs in this unit. But i didnt like the Study Guides.My qustion is what is a molecule again?