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