Physical and Chemical Changes

        Hello, people! Okay, so we're not completely finished with the periodic table of elements. The stuff I'm going to talk about today has the periodic table in it, but it's not all about the periodic table. So... chemical and physical reactions. It's pretty hard to understand, but not super hard. But, it is, in fact, high school stuff. So if you wanna get ready for high school, then be prepared! It's gonna get hard!
        Let's start with the basics. First up, chemical reactions! 'Kay, chemical reactions are basically when you make one thing change into another. Like, say you have a match and a piece of paper and you light the piece if paper on fire:

Paper on fire

         Okay, so when the fire consumes the paper completely, it will turn to ash. It can never change back into a piece of paper. That's a chemical change. A physical change is different. A physical change is a change in appearance. Say you have another piece of paper. If you crumble it up, it's still a pice of paper. You didn't change that.



Crumpled paper

        Now let's talk about products and reactants. But first, here's the real definition of a chemical and a physical change:

• Chemical Change: produce new substances that have properties different of the original substances.
• Physical Change: affects only it's physical properties, such as size and shape, or whether it's a solid, liquid, or gas.
• Product: the substances that form as a result  of the reaction
• Reactants: the substances that exist before the reaction

        I know this is hard to understand. I really do, seeing as I'm the one who has to learn it. Basically, a product is what you start out with, like a match and a piece of paper. A reactant is what you finish with, like ash. Here's a video: