Conservation of Matter
and
Balancing the Equation
Peking
Oxygen
O O
Hydrogen
H H
Oxygen
O O
What type of bond does
O2 have?
Oxygen
O O
What type of bond does
O2 have?
Two, it is double bonded
Hydrogen
H H
What type of bond does H2
have?
Hydrogen
H H
What 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 +2H22H2O
O O
H H H H
Balancing the Equation
O2 +2H22H2O
O O
H H H H
O2 +2H22H2O
O O
H H H H
O2 +2H22H2O
O O
H H H H
O2 +2H22H2O
O O
H H H H
O2 +2H22H2O
O O
H H H H
O2 +2H22H2O
O O
H H H H
Conservation of Matter
O2 +2H22H2O
Conservation of Matter
reactant
Subscript
O2 +2H22H2O
Conservation of Matter
reactant
Subscript
Tells us how many of the element
O2 +2H22H2O
Conservation of Matter
reactant
What is this?
Tells us how many of the element
O2 +2H22H2O
Conservation of Matter
reactant
Subscript
What does it tell us?
O2 +2H22H2O
Conservation of Matter
reactant
Subscript
Tells us how many of the element
O2 +2H22H2O
Conservation of Matter
reactant
Refers to the Hydrogen
O2 +2H22H2O
Conservation of Matter
reactant
Refers to the MOLECULE
O2 +2H22H2O
Conservation of Matter
reactant
(2x2=4)
4 hydrogens
O2 +2H22H2O
Conservation of Matter
reactant
(2x2=4)
4 hydrogens
2 oxygens
This molecule
O2 +2H22H2O
Conservation of Matter
(2x2=4)
4 hydrogens
2 oxygens
This molecule
Questions- Answer now
1. The valence electron of Oxygen, and how many
does it need to be stable?
2. The valence electron o...
• With how many elements can oxygen react?
• 4.With how many elements can hydrogen
react?
• 5.With how many elements can c...
Questions- Answer now
6. CO2 – How many oxygen atoms?
7. CO2 – How many Carbon atoms?
8. NaCl– How many chlorine atoms?
9....
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 conserva...
chemical formula
• All substances are formed from ~ 100
elements
– All substances = Everything
• Shorthand way to represen...
chemical formula
• All substances are formed from ~ 100
elements
– All substances = Everything
• Shorthand way to represen...
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 = 30
H = 60
O= 30
Come back to naming
pag...
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 goi...
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 product...
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-
1.How many Na on reactant side?
2.How many H on reactant ...
A Balanced Equation
NaHCO3 + CH3COOH → CO2 + H2O + Na+ +
CH3COO-
5. How many Na on product side?
6. How many H on product ...
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= wit...
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Conservation of Matter and Balancing Equations

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science Conservation of matter - Equation balance

  1. 1. Conservation of Matter and Balancing the Equation Peking
  2. 2. Oxygen O O
  3. 3. Hydrogen H H
  4. 4. Oxygen O O What type of bond does O2 have?
  5. 5. Oxygen O O What type of bond does O2 have? Two, it is double bonded
  6. 6. Hydrogen H H What type of bond does H2 have?
  7. 7. Hydrogen H H What type of bond does H2 have? One, it is single bonded
  8. 8. Gas: Oxygen and Hydrogen • How many oxygen atoms do you see?
  9. 9. Gas: Oxygen and Hydrogen • How many oxygen atoms do you see? Two
  10. 10. Gas: Oxygen and Hydrogen • How many oxygen atoms do you see? Two
  11. 11. Gas: Oxygen and Hydrogen • How many oxygen molecules do you see?
  12. 12. Gas: Oxygen and Hydrogen • How many oxygen molecules do you see? ONE
  13. 13. Gas: Oxygen and Hydrogen • How many oxygen molecules do you see? ONE
  14. 14. Gas: Oxygen and Hydrogen • How many hydrogen atoms do you see?
  15. 15. Gas: Oxygen and Hydrogen • How many hydrogen atoms do you see? Four
  16. 16. Gas: Oxygen and Hydrogen • How many hydrogen atoms do you see? Four
  17. 17. Gas: Oxygen and Hydrogen • How many hydrogen molecules do you see? Two
  18. 18. O2 +2H22H2O O O H H H H Balancing the Equation
  19. 19. O2 +2H22H2O O O H H H H
  20. 20. O2 +2H22H2O O O H H H H
  21. 21. O2 +2H22H2O O O H H H H
  22. 22. O2 +2H22H2O O O H H H H
  23. 23. O2 +2H22H2O O O H H H H
  24. 24. O2 +2H22H2O O O H H H H Conservation of Matter
  25. 25. O2 +2H22H2O Conservation of Matter reactant Subscript
  26. 26. O2 +2H22H2O Conservation of Matter reactant Subscript Tells us how many of the element
  27. 27. O2 +2H22H2O Conservation of Matter reactant What is this? Tells us how many of the element
  28. 28. O2 +2H22H2O Conservation of Matter reactant Subscript What does it tell us?
  29. 29. O2 +2H22H2O Conservation of Matter reactant Subscript Tells us how many of the element
  30. 30. O2 +2H22H2O Conservation of Matter reactant Refers to the Hydrogen
  31. 31. O2 +2H22H2O Conservation of Matter reactant Refers to the MOLECULE
  32. 32. O2 +2H22H2O Conservation of Matter reactant (2x2=4) 4 hydrogens
  33. 33. O2 +2H22H2O Conservation of Matter reactant (2x2=4) 4 hydrogens 2 oxygens This molecule
  34. 34. O2 +2H22H2O Conservation of Matter (2x2=4) 4 hydrogens 2 oxygens This molecule
  35. 35. 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?
  36. 36. • 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?
  37. 37. 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
  38. 38. Word Wise • The root equ- means “even” or “equal”. – Balanced – The same
  39. 39. Word Wise- It’s wise to know them Vocabulary - chemical formula - chemical equation - reactant - product - law of conservation of mass •Page 262-64
  40. 40. chemical formula • All substances are formed from ~ 100 elements – All substances = Everything • Shorthand way to represent a substance.
  41. 41. 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
  42. 42. chemical formula • How many carbons in sugar? ¿Cuántos átomos de carbono en el azúcar? – Hydrogens? – Oxygens?
  43. 43. COEFFICIENT 5C6H12O6 COEFFICIENT
  44. 44. COEFFICIENT 5C6H12O6 COEFFICIENT coefficient is a number that is placed in front of a chemical symbol or formula
  45. 45. chemical formula • How many carbons in sugar? –Hydrogens? –Oxygens? 5C6H12O6 Come back to naming page 263
  46. 46. chemical formula • How many carbons in sugar? – Hydrogens? – Oxygens? 5C6H12O6 C = 30 H = 60 O= 30 Come back to naming page 263
  47. 47. COEFFICIENT If you see 4O2 in an equation, what is the coefficient? How many oxygen molecules? How many oxygen atoms?
  48. 48. More parts of a chemical equation The formulas of the reactants are written before the arrow .
  49. 49. More parts of a chemical equation • The formulas of the reactants are written before the arrow . +the two formulas are going to combine
  50. 50. More parts of a chemical equation • Product written after the arrow.
  51. 51. Reactants Product
  52. 52. Which is Product? Which are Reactants? • Plus sign = – the reactants are added together. • The arrow points to the products.
  53. 53. A Balanced Equation NaHCO3 + CH3COOH → CO2 + H2O + Na+ + CH3COO-
  54. 54. A Balanced Equation NaHCO3 + CH3COOH → CO2 + H2O + Na+ + CH3COO-
  55. 55. A Balanced Equation NaHCO3 + CH3COOH → CO2 + H2O + Na+ + CH3COO- 1.How many Na on reactant side? 2.How many H on reactant side? 3.How many C on reactant side? 4.How many O on reactant side?
  56. 56. 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?
  57. 57. Explain if you think the Equation is Balanced NaHCO3 + CH3COOH → CO2 + H2O + Na+ + CH3COO-
  58. 58. Baking soda + Vinegar NaHCO3 + CH3COOH →
  59. 59. 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?

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