Chemical Reactions

Chemical Reactions

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  • Mrs. Henderson, how do you balance a chemical equation?
  • Well Allie, let me show you an example.
  • Here's a sample equation. P4 + Br2 >PBr3 So first of all this is a synthesis reaction.
  • P4 + Br2 >PBr3 First of all everything to the left of the arrow are called the reactants. Everything to the right of the arrow are called the product. The arrow is also known as the yield sign.
  • P4 + Br2 >PBr3 The first thing you do is realize that to get the P's equal on both sides you must put a 4 in front of the PBr3
  • Now the equation is P4 + Br2 > 4PBr3 So now the P's are equal, and in order to make the Br's equal you have to multiply the Br2 by 6. 
  • Now your final product is: 1P4 + 6Br2 > 4PBr3 Everything is now equal. And that, Allie, is how you balance a chemical equation. 
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