Lately in class, we have started a new unit in class over chemical reactions. A few key things we learned to recognize if it is a chemical reaction is if: 1.) color changes 2.) a solid forms (this would be a double replacement reaction-precipitate) 3.) bubbles form 4.) heat and/or a flame is produced, or heat is absorbed. Some of the other basics we learned is within the reaction, everything to the left of the arrow is called reactants, while everything to the right is called products. Next, there are four main labelings we have been doing, these being gas (g), liquid (l), solid (s), and aqueous (aq), and these all play a part in how you go about breaking down and figuring out equations. Next, we learned that subscripts tell the number of atoms of each element in a molecule, and coefficients tell the number of molecules, and these are both clear when combining elements and balancing. This balancing I mentioned is also something we learned; it is making both sides of the reaction equal or balanced in the number of elements that are present on each side.
Here is a helpful video I found that reinforces all these basics: https://www.youtube.com/watch?v=sROBNKKJwfY
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