h2oh2o review: how to make a molecule… no subscript, there is only 1 atom of oxygen in the...
Post on 18-Dec-2015
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H2O
Review: How to make a molecule…
No Subscript, There is only 1 atom of oxygen in the molecule
Subscript
Visual modelFormula
H2O
Review: How to make a molecule…
No Subscript, There is only 1 atom of oxygen in the molecule
Subscript
Visual modelFormula
H2O2
6 H2O
Review: How to make a molecule…Visual modelFormula
Coefficient- How many molecules you have.
H2O
1 molecule of H2O
3 H2O
3 molecules of H2O
Let’s now model another chemical equation with our M&M’s…
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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
Is it a balanced equation? How do we know?
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Chemical equation
C + O2 CO2
Visual model
+
Word equation
Number of atoms
1 atom carbon + 1 molecule oxygen 1 molecule CO2
1 carbon 2 oxygen 1 carbon 2 oxygen
Law of Conservation of Mass
Matter is not created or destroyed, it just changes forms.In a chemical reaction…
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
More practice…
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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
Is it balanced?
2 carbons 4 oxygen 3 carbons 6 oxygens
With a partner…
Instructions:1. Create visual models for the rest of the chemical
equations.2. 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
The model above is best represented by:a. H2O
b. 2OHc. HOOHd. H2O2
The above model shows:a. 10 atomsb. 2 moleculesc. 2CH3Cl
d. All of the above
6CO2+ 6H20+ Sun’s light C6H12O6+6O2
The above reaction…a. is photosynthesisb. Is respirationc. Transforms radiant energy into chemical
energyd. Both a and c.
Organic Molecules all contain…
a. Sulfurb. Carbonc. Oxygend. nitrogen
Correct!
All of the following are organic molecules except…
a. C6H12O6
b. CH4
c. C6H6O
d. H20
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• A change in odor
A chemical equation tells the story of a chemical reaction. Our combustion reaction again…
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Physical properties
White crystal To yield
Black crystal/powderGas 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
Chemical Reaction Dehydration of sugar…
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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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