(2.3) Balancing Chemical Equations (p150). Conservation of Mass As we saw in class, the mass of the...
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Transcript of (2.3) Balancing Chemical Equations (p150). Conservation of Mass As we saw in class, the mass of the...
![Page 1: (2.3) Balancing Chemical Equations (p150). Conservation of Mass As we saw in class, the mass of the reactants must equal the mass of the products in a.](https://reader036.fdocuments.us/reader036/viewer/2022082818/56649f175503460f94c2e223/html5/thumbnails/1.jpg)
(2.3) Balancing Chemical Equations
(p150)
![Page 2: (2.3) Balancing Chemical Equations (p150). Conservation of Mass As we saw in class, the mass of the reactants must equal the mass of the products in a.](https://reader036.fdocuments.us/reader036/viewer/2022082818/56649f175503460f94c2e223/html5/thumbnails/2.jpg)
Conservation of Mass
As we saw in class, the mass of the reactants must equal the mass of the products in a chemical reaction.
To show that a reaction is balanced, we must write a balanced chemical equation.
In a balanced chemical equation, the number of atoms on each side of the equation is the same.
![Page 3: (2.3) Balancing Chemical Equations (p150). Conservation of Mass As we saw in class, the mass of the reactants must equal the mass of the products in a.](https://reader036.fdocuments.us/reader036/viewer/2022082818/56649f175503460f94c2e223/html5/thumbnails/3.jpg)
How To Write a Balanced Chemical Equation
1. The chemical formula for a substance CANNOT be changed!ex. CO2 molecules must stay as CO2
![Page 4: (2.3) Balancing Chemical Equations (p150). Conservation of Mass As we saw in class, the mass of the reactants must equal the mass of the products in a.](https://reader036.fdocuments.us/reader036/viewer/2022082818/56649f175503460f94c2e223/html5/thumbnails/4.jpg)
How To Write a Balanced Chemical Equation
2. From the word equation, write the chemical equation using the correct chemical formula for all the substances involved.
ex. The combustion of ethanol (C2H6OH)
ethanol+ oxygen carbon dioxide + water
C2H6OH + O2 CO2 + H2O
![Page 5: (2.3) Balancing Chemical Equations (p150). Conservation of Mass As we saw in class, the mass of the reactants must equal the mass of the products in a.](https://reader036.fdocuments.us/reader036/viewer/2022082818/56649f175503460f94c2e223/html5/thumbnails/5.jpg)
How To Write a Balanced Chemical Equation3. Count the number of atoms in both the reactants and
products.4. Multiply each formula by a coefficient to balance the
number of each kind of atom in both the reactants and products.
![Page 6: (2.3) Balancing Chemical Equations (p150). Conservation of Mass As we saw in class, the mass of the reactants must equal the mass of the products in a.](https://reader036.fdocuments.us/reader036/viewer/2022082818/56649f175503460f94c2e223/html5/thumbnails/6.jpg)
THE RAP SHEET
The RAP sheet is a methodology used to help balance chemical equations.
It helps keep track of the number and kinds of atoms in a chemical equation.
![Page 7: (2.3) Balancing Chemical Equations (p150). Conservation of Mass As we saw in class, the mass of the reactants must equal the mass of the products in a.](https://reader036.fdocuments.us/reader036/viewer/2022082818/56649f175503460f94c2e223/html5/thumbnails/7.jpg)
RReactants
AAtoms
PProducts
C
H
O
2
6
3
C2H5OH + O2 CO2 + H2OAdd coefficient 2 CO2
Add coefficient 3 to H2OAdd coefficient 3 to O2
1
2
3
2
5
6
77
![Page 8: (2.3) Balancing Chemical Equations (p150). Conservation of Mass As we saw in class, the mass of the reactants must equal the mass of the products in a.](https://reader036.fdocuments.us/reader036/viewer/2022082818/56649f175503460f94c2e223/html5/thumbnails/8.jpg)
TRY THESE Worksheets 2.3 (D) and 2.3
(E)
![Page 9: (2.3) Balancing Chemical Equations (p150). Conservation of Mass As we saw in class, the mass of the reactants must equal the mass of the products in a.](https://reader036.fdocuments.us/reader036/viewer/2022082818/56649f175503460f94c2e223/html5/thumbnails/9.jpg)
(2.3) Balancing Chemical Equations
(p150)
![Page 10: (2.3) Balancing Chemical Equations (p150). Conservation of Mass As we saw in class, the mass of the reactants must equal the mass of the products in a.](https://reader036.fdocuments.us/reader036/viewer/2022082818/56649f175503460f94c2e223/html5/thumbnails/10.jpg)
ASSIGNMENTS: Workbook p56 p60-63