science conservation of matter - equation balance
DESCRIPTION
Conservation of Matter and Balancing EquationsTRANSCRIPT
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Conservation of Matterand
Balancing the EquationPeking
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Oxygen
O O
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Hydrogen
H H
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Oxygen
O OWhat type of bond does O2 have?
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Oxygen
O OWhat type of bond does O2 have?
Two, it is double bonded
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Hydrogen
H HWhat type of bond does H2
have?
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Hydrogen
H HWhat type of bond does H2
have?One, it is single bonded
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Gas: Oxygen and Hydrogen
• How many oxygen atoms do you see?
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Gas: Oxygen and Hydrogen
• How many oxygen atoms do you see?
Two
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Gas: Oxygen and Hydrogen
• How many oxygen atoms do you see?
Two
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Gas: Oxygen and Hydrogen
• How many oxygen molecules do you see?
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Gas: Oxygen and Hydrogen
• How many oxygen molecules do you see?
ONE
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Gas: Oxygen and Hydrogen
• How many oxygen molecules do you see?
ONE
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Gas: Oxygen and Hydrogen
• How many hydrogen atoms do you see?
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Gas: Oxygen and Hydrogen
• How many hydrogen atoms do you see?
Four
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Gas: Oxygen and Hydrogen
• How many hydrogen atoms do you see?
Four
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Gas: Oxygen and Hydrogen
• How many hydrogen molecules do you see?
Two
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O2 +2H22H2O
O OH H H H
Balancing the EquationBalancing the Equation
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O2 +2H22H2O
O OH H H H
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O2 +2H22H2O
O OH H H H
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O2 +2H22H2O
O OH H H H
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O2 +2H22H2O
O OH H H H
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O2 +2H22H2O
O OH H H H
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O2 +2H22H2O
O OH H H H
Conservation of MatterConservation of Matter
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O2 +2H22H2O
Conservation of MatterConservation of Matter
reactant
Subscript
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O2 +2H22H2O
Conservation of MatterConservation of Matter
reactant
Subscript
Tells us how many of the element
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O2 +2H22H2O
Conservation of MatterConservation of Matter
reactant
What is this?What is this?
Tells us how many of the element
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O2 +2H22H2O
Conservation of MatterConservation of Matter
reactant
Subscript
What does it tell us?What does it tell us?
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O2 +2H22H2O
Conservation of MatterConservation of Matter
reactant
Subscript
Tells us how many of the elementTells us how many of the element
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O2 +2H22H2O
Conservation of MatterConservation of Matter
reactant
Refers to the HydrogenRefers to the Hydrogen
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O2 +2H22H2O
Conservation of MatterConservation of Matter
reactant
Refers to the MOLECULERefers to the MOLECULE
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O2 +2H22H2O
Conservation of MatterConservation of Matter
reactant
(2x2=4) (2x2=4)
4 hydrogens4 hydrogens
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O2 +2H22H2O
Conservation of MatterConservation of Matter
reactant(2x2=4) (2x2=4)
4 hydrogens 2 oxygensThis molecule
4 hydrogens 2 oxygensThis molecule
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O2 +2H22H2O
Conservation of MatterConservation of Matter
(2x2=4) (2x2=4)
4 hydrogens 2 oxygensThis molecule
4 hydrogens 2 oxygensThis molecule
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Questions- Answer now
1. The valence electron of Oxygen, and how many does it need to be stable?
2. The valence electron of carbon, and how many does it need to be stable?
3. With how many elements can oxygen react?4. With how many elements can hydrogen react?5. With how many elements can carbon react?
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• With how many elements can oxygen react?• 4.With how many elements can hydrogen
react?
• 5.With how many elements can carbon react?• 6. CO2 – How many oxygen atoms?
• 7. CO2 – How many Carbon atoms?
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Questions- Answer now
6. CO2 – How many oxygen atoms?
7. CO2 – How many Carbon atoms?
8. NaCl – How many chlorine atoms?
9. 4CO2 – How many oxygen atoms?
10. 4CO2 – How many Molecules?
11. What have you learned
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Word Wise
• The root equ- means “even” or “equal”.
– Balanced– The same
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Word Wise- It’s wise to know them
Vocabulary - chemical formula - chemical equation - reactant - product - law of conservation of mass
•Page 262-64
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chemical formula• All substances are formed from ~ 100
elements– All substances = Everything
• Shorthand way to represent a substance.
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chemical formula• All substances are formed from ~ 100
elements– All substances = Everything
• Shorthand way to represent a substance.• Todas las sustancias se forman a partir de ~ 100
elementos • Todas las sustancias = Todo
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chemical formula• How many carbons in sugar? ¿Cuántos átomos de
carbono en el azúcar?
– Hydrogens?– Oxygens?
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COEFFICIENT
5C6H12O6
COEFFICIENT
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COEFFICIENT
5C6H12O6
COEFFICIENT
coefficient is a number that is placed in front of a chemical symbol or formula
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chemical formula• How many carbons in sugar?
–Hydrogens?–Oxygens?
5C6H12O6
Come back to naming page 263
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chemical formula• How many carbons in sugar?
– Hydrogens?– Oxygens?
5C6H12O6
C = 30H = 60O= 30
Come back to naming page 263
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COEFFICIENT
If you see 4O2 in an equation, what is the coefficient?
How many oxygen molecules?
How many oxygen atoms?
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More parts of a chemical equation
The formulas of the reactants are written before the arrow .
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More parts of a chemical equation
• The formulas of the reactants are written before the arrow .
+ the two formulas are going to
combine
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More parts of a chemical equation
• Product written after the arrow.
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Reactants Product
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Which is Product?Which are Reactants?
• Plus sign =– the reactants are added together.
• The arrow points to the products.
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A Balanced Equation
NaHCO3 + CH3COOH → CO2 + H2O + Na+ + CH3COO-
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A Balanced Equation
NaHCO3 + CH3COOH → CO2 + H2O + Na+ + CH3COO-
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A Balanced Equation
NaHCO3 + CH3COOH → CO2 + H2O + Na+ + CH3COO-
• How many Na on reactant side?• How many H on reactant side?• How many C on reactant side?• How many O on reactant side?
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A Balanced Equation
NaHCO3 + CH3COOH → CO2 + H2O + Na+ + CH3COO-
5. How many Na on product side?6. How many H on product side?7. How many C on product side?8. How many O on product side?
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Explain if you think the Equation is Balanced
NaHCO3 + CH3COOH → CO2 + H2O + Na+ + CH3COO-
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Baking soda + Vinegar
NaHCO3 + CH3COOH →
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Baking soda + Vinegar
NaHCO3 + CH3COOH →Na= with how many atoms may it
react?H= with how many atoms may it react?C= with how many atoms may it react?
O= with how many atoms may it react?