Hello it's 74 TJ again. This is my Changes of Matter reflection. Three things I learned this unit is a.) the differences between acids and bases, b.) neutralization is the combining of an acid and a base making  water and salt, and c.) the pH scale is numbered from 0 to 14. I liked the acid and base activity the most. The thing I liked the least was learning about excothermic and endothermic. I still don't understand the difference between  excothermic and endothermic. Can all of 6th grade help me.