Do Now:

1
Do Now
Explain this joke.
2
Lets make some visual models with MMs
You will be able to 8.5(D)  recognize that
chemical formulas are used to identify substances
and determine the number of atoms of each element
in chemical formulas containing
subscripts 8.5(F)  recognize whether a chemical
equation containing coefficients is balanced or
not and how that relates to the law of
conservation of mass.
Key Red-Chlorine Orange-Sodium Yellow-Oxygen Gr
een-Hydrogen Blue- Carbon
3
Review How to make a molecule
Visual model
Formula
H2O
Subscript
No Subscript, There is only 1 atom of oxygen
in the molecule
4
Review How to make a molecule
Visual model
Formula
H2O
No Subscript, There is only 1 atom of oxygen
in the molecule
Subscript
H2O2
5
Review How to make a molecule
Visual model
Formula
6 H2O
Coefficient- How many molecules you have.
6
H2O
1 molecule of H2O
7
3 H2O
3 molecules of H2O
8
Lets make some visual models with MMs
You will be able to 8.5(D)  recognize that
chemical formulas are used to identify substances
and determine the number of atoms of each element
in chemical formulas containing
subscripts 8.5(F)  recognize whether a chemical
equation containing coefficients is balanced or
not and how that relates to the law of
conservation of mass.
Key Red-Chlorine Orange-Sodium Yellow-Oxygen Gr
een-Hydrogen Blue- Carbon
9
Lets now model another chemical equation with
our MMs
Reactants products
Chemical equation C O2 ? CO2
Visual model ?
Word equation To yield
Number of atoms ?
1 atom carbon react with 1 molecule oxygen
1 molecule CO2
1 carbon 2 oxygen
1 carbon 2 oxygen
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Is it a balanced equation? How do we know?
Reactants products
Chemical equation C O2 ? CO2
Visual model ?
Word equation ?
Number of atoms
1 molecule CO2
1 atom carbon 1 molecule oxygen
1 carbon 2 oxygen
1 carbon 2 oxygen
11
Law of Conservation of Mass

• Matter is not created or destroyed, it just
  changes forms.
• In a chemical reaction

12
Evidence of a chemical reaction (chemical
change)

• Production of a gas (bubbling, fizzing or
  foaming)
• A change in temperature or light (an energy
  change)
• Appearance of a precipitate (solid material)
• A change in color

13
More practice
Reactants products
Chemical equation 2C 2O2 ? 3CO2
Visual model ?
Word equation To yield
Number of atoms
2 atoms carbon react with 2 molecule oxygen
3 molecules CO2
2 carbons 4 oxygen
3 carbons 6 oxygens
Is it balanced?
14
With a partner

• Instructions
• Create visual models for the rest of the chemical
  equations.
• Draw an label the visual models.
• 3. For each equation complete the following stem
• The equation is/is not balanced because

Chlorine Sodium Oxygen Hydrogen Carbon
Color Key
15
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16

• The model above is best represented by
• H2O
• 2OH
• HOOH
• H2O2

17

• The above model shows
• 10 atoms
• 2 molecules
• 2CH3Cl
• All of the above

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6CO2 6H20 Suns light ?C6H12O66O2

• The above reaction
• is photosynthesis
• Is respiration
• Transforms radiant energy into chemical energy
• Both a and c.

25
Organic Molecules all contain

1. Sulfur
2. Carbon
3. Oxygen
4. nitrogen

26
All of the following are organic molecules except

1. C6H12O6
2. CH4
3. C6H6O
4. H20

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Yesterday we

•  investigated how evidence of chemical reactions
  indicates that new substances with different
  properties are formed.

31
Evidence of a chemical reaction (chemical
change)

• Production of a gas (bubbling, fizzing or
  foaming)
• A change in temperature or light (an energy
  change)
• Appearance of a precipitate (solid material)
• A change in color

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A chemical equation tells the story of a chemical
reaction. Our combustion reaction again
Reactants products
Physical properties White crystal To yield Black crystal/powder Gas produced
Chemical equation C12H22O11  12 O2  ? 12 CO2  11 H2O
Visual model ?
Number of atoms 12 atoms carbon 22 atoms hydrogen 35 oxygen atoms ? 12 atoms carbon 22 atoms hydrogen 35 oxygen atoms
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Chemical Reaction Dehydration of sugar
Reactants products
Physical properties White crystal To yield Black crystal/powder and white gas
Chemical equation C12H22O11   ? 12 C  11 H2O (vapor)
Visual model ?
Number of atoms 12 carbons 22 Hydrogen 11 oxygen ? 12 carbons 22 hydrogens 11 oxygens
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Chemistry Practice with Qwizdom Remotes

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