the question (learning goals) of conservation of mass ppt2.pdfsteps for balancing equations write...
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![Page 1: The Question (Learning Goals) of Conservation of Mass PPT2.pdfSteps for Balancing Equations Write down all the atoms under the “yields” arrow. Write the number of each atom on](https://reader034.vdocument.in/reader034/viewer/2022042413/5f2d09db3e3cb8274c0dd8ab/html5/thumbnails/1.jpg)
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The Question (Learning Goals)
What is the Law of Conservation of Mass (or atoms)?
What is a balanced Chemical Reaction?
How do we balance a chemical reaction?? (A Level)
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Review: Chemical Reactions
Chemical Reactions Rearrange atoms and molecules. They do not create or destroy them!!
New Product atoms and old Reactantatoms are not created or destroyed. ATOMS ARE ALWAYS CONSERVED!!!
Reactants Products
to produce
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Review: Chemical Equations
When a chemical reaction is written using chemical formulas and symbols, it is called a chemical equation.
All chemical equations have yields arrows!!
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Conservation of Mass or Atoms
When chemicals are reacted in a closed system (container), you can show that the mass before and after the reaction is the same.
There must always, always, always be the same number of Reactant atoms and Product atoms for each type of atom!!
This concept is THE KEY CONCEPT!!!!
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Conservation of Mass or Atoms
Lavoisier showed that a closed system must be used when studying chemical reactions.
Closed System: Is a “system” where nothing can come in or go out.
![Page 7: The Question (Learning Goals) of Conservation of Mass PPT2.pdfSteps for Balancing Equations Write down all the atoms under the “yields” arrow. Write the number of each atom on](https://reader034.vdocument.in/reader034/viewer/2022042413/5f2d09db3e3cb8274c0dd8ab/html5/thumbnails/7.jpg)
Conservation of Mass or Atoms
When chemicals are reacted in a closed system (container), you can show that the mass before and after the reaction is the same.
There must always, always, always be the same number of Reactant atoms and Product atoms for each type of atom!!
This concept is the KEY CONCEPT!!!!!
http://www.lghs.net/ourpages/users/dburns/scienceonsimpsons/Clips_files/ConservationofMass.m4v
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Numbers in equations
2
Coefficients
Tells you how many
of each type of
reactant or product
molecule in the
reaction.2
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Balancing Equations
The combined mass of the burning wood and oxygen is converted into carbon dioxide and water.
The law of Conservation of Atoms (or Mass) tells us that there must be the same number of atoms on each side of the chemical equation!!!!
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Rules for Balancing Equations
1. Atoms of Reactants must equal atoms of Products.
2. Coefficients are used to balance chemical equations.
3. Never change a submarine-script.
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Write down all the atoms under the “yields” arrow.
Write the number of each atom on the Reactant and Product side of the equation.
Does this obey the law of conservation of mass
If ALL of the numbers match there is no VIOLATION of the Law of Conservation of mass?
Does this obey the law of conservation of mass?
If not use Coefficients to balance the numbers.
Steps for Balancing Equations
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2 Na + O2 → 2 Na2O
Na
O
Steps for Balancing EquationsWrite down all the atoms under the “yields” arrow.Write the number of each atom on the Reactant and
Product side of the equation.If ALL of the numbers match there is no VIOLATION of the Law of Conservation of mass?
Does this obey the law of conservation of mass?
If not use Coefficients to balance the numbers.
![Page 13: The Question (Learning Goals) of Conservation of Mass PPT2.pdfSteps for Balancing Equations Write down all the atoms under the “yields” arrow. Write the number of each atom on](https://reader034.vdocument.in/reader034/viewer/2022042413/5f2d09db3e3cb8274c0dd8ab/html5/thumbnails/13.jpg)
2 CH4 + O2 → 2 CO2 + H2O
C
H
O
Steps for Balancing EquationsWrite down all the atoms under the “yields” arrow.Write the number of each atom on the Reactant and
Product side of the equation.If ALL of the numbers match there is no VIOLATION of the Law of Conservation of mass?
Does this obey the law of conservation of mass?
If not use Coefficients to balance the numbers.
![Page 14: The Question (Learning Goals) of Conservation of Mass PPT2.pdfSteps for Balancing Equations Write down all the atoms under the “yields” arrow. Write the number of each atom on](https://reader034.vdocument.in/reader034/viewer/2022042413/5f2d09db3e3cb8274c0dd8ab/html5/thumbnails/14.jpg)
Al + 3 O2 → 2 Al2O3
Al
O
Steps for Balancing EquationsWrite down all the atoms under the “yields” arrow.Write the number of each atom on the Reactant and
Product side of the equation.If ALL of the numbers match there is no VIOLATION of the Law of Conservation of mass?
Does this obey the law of conservation of mass?
If not use Coefficients to balance the numbers.
![Page 15: The Question (Learning Goals) of Conservation of Mass PPT2.pdfSteps for Balancing Equations Write down all the atoms under the “yields” arrow. Write the number of each atom on](https://reader034.vdocument.in/reader034/viewer/2022042413/5f2d09db3e3cb8274c0dd8ab/html5/thumbnails/15.jpg)
2 NaClO3 → 2 NaCl + 3 O2
Na
Cl
O
Steps for Balancing EquationsWrite down all the atoms under the “yields” arrow.Write the number of each atom on the Reactant and
Product side of the equation.If ALL of the numbers match there is no VIOLATION of the Law of Conservation of mass?
Does this obey the law of conservation of mass?
If not use Coefficients to balance the numbers.
![Page 16: The Question (Learning Goals) of Conservation of Mass PPT2.pdfSteps for Balancing Equations Write down all the atoms under the “yields” arrow. Write the number of each atom on](https://reader034.vdocument.in/reader034/viewer/2022042413/5f2d09db3e3cb8274c0dd8ab/html5/thumbnails/16.jpg)
The Answer
What is a balanced Chemical Reaction?
One with equal numbers of atoms on each side of the “yields” arrow. (Matter is never created nor destroyed!!)
How do we balance a chemical reaction??
With coefficients!!
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NaHCO3(s) + HCl (l) → NaCl (aq) + H2O (l) + CO2 (g)
1 Na 1
2 H 2
1 C 1
3 O 3
1 Cl 1
Steps for Balancing Equations
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CH4 + 2O2 → CO2 + 2H2O
1 C 1
4 H 4
4 O 4
Steps for Balancing Equations
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4 Al + 3 O2 → 2 Al2O3
4 Al 4
6 O 6
Steps for Balancing Equations
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CH4 + O2 → CO2 + H2O
1 C 1
4 H 2
2 O 3
Steps for Balancing Equations
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Al + O2 → Al2O3
1 Al 2
2 O 3
Steps for Balancing Equations
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C7H17 + O2 → H2O + CO2
C
H
O
Steps for Balancing Equations
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NaBr + Li3PO4 → LiBr + Na3PO4
Na
Br
P
O
Li
Steps for Balancing Equations
![Page 24: The Question (Learning Goals) of Conservation of Mass PPT2.pdfSteps for Balancing Equations Write down all the atoms under the “yields” arrow. Write the number of each atom on](https://reader034.vdocument.in/reader034/viewer/2022042413/5f2d09db3e3cb8274c0dd8ab/html5/thumbnails/24.jpg)
C7H17 + O2 → H2O + CO2
C
H
O
Steps for Balancing EquationsWrite down all the atoms under the “yields” arrow.Write the number of each atom on the Reactant and
Product side of the equation.Do they match? If not use Coefficients to balance the
numbers.
![Page 25: The Question (Learning Goals) of Conservation of Mass PPT2.pdfSteps for Balancing Equations Write down all the atoms under the “yields” arrow. Write the number of each atom on](https://reader034.vdocument.in/reader034/viewer/2022042413/5f2d09db3e3cb8274c0dd8ab/html5/thumbnails/25.jpg)
NaBr + Li3PO4 → LiBr + Na3PO4
Na
Br
P
O
Li
Steps for Balancing EquationsWrite down all the atoms under the “yields” arrow.Write the number of each atom on the Reactant and
Product side of the equation.Do they match? If not use Coefficients to balance the
numbers.
![Page 26: The Question (Learning Goals) of Conservation of Mass PPT2.pdfSteps for Balancing Equations Write down all the atoms under the “yields” arrow. Write the number of each atom on](https://reader034.vdocument.in/reader034/viewer/2022042413/5f2d09db3e3cb8274c0dd8ab/html5/thumbnails/26.jpg)
NaHCO3(s) + HCl (l) → NaCl (aq) + H2O (l) + CO2 (g)
Na
H
C
O
Cl
Steps for Balancing EquationsWrite down all the atoms under the “yields” arrow.Write the number of each atom on the Reactant and
Product side of the equation.Do they match? If not use Coefficients to balance the
numbers.