# Chem Stuff 4

More Options: Make a Folding Card

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• From there, you put place different coefficients in front of the elements in the equation to see if they make both sides equal. This method might take a while because you won't always know right away which coefficients are the right ones. C﻿H4﻿+2﻿O2 --> CO2﻿+﻿2H2O C= 1 C= 1 H= 4 H= 2 4 O= 2 4 ﻿O= 2 + 1 2 = 3 4 ﻿
• Wow!! That's pretty rad!!﻿
• ﻿Rad it is! The other way is called ﻿systems of equations. I'll demonstrate with the same equation I just showed you.
• There we go!! Now the equation is balanced. ﻿
• First, we place variables above each element/ compound. Similar to the trial and error method, you must write the chemical symbols underneath the equation in the same order on both sides. C﻿H4﻿+O2 --> CO2﻿+﻿H2O C= 1 C= 1 H= 4 H= 2 O= 2 ﻿O= 2 + 1 = 3 ﻿
• Now, you substitute the variable for the element symbol as you write out the number of each element next to their symbol on their respective sides. After that, write out the variables and make one of them equivalent to 1. C﻿H4﻿+O2 --> CO2﻿+﻿H2O C= A = C A= 1 H= 4A =2D B= O= 2B =2C+D C= D= ﻿
• Once you know that, you can figure out the value of each of the variables. The value of each variable is the coefficient that should go with the element/compound that is under the variable. And that's it!! C﻿H4﻿+2O2 --> CO2﻿+﻿2H2O C= A = C A= 1 H= 4A =2D B=2 O= 2B =2C+D C=1 D=2 ﻿
• Gee, thanks Elprup!! Now we know all about the Law of Conservation of Mass AND balancing chemical equations AND the types of chemical equations!! ﻿
• It was my pleasure! It seems as if Der's fixed the ship. Well, my crew and I have to depart. You Earthens have fun with your combustion!
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