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

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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?Reactants products

Chemical equation

C + O2 CO2

Visual model

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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 MassMatter 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

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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. H2Ob. 2OHc. HOOHd. H2O2

The above model shows:a. 10 atomsb. 2 moleculesc. 2CH3Cld. 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. C6H6Od. 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

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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

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Number of atoms 12 carbons 22 Hydrogen 11 oxygen

12 carbons 22 hydrogens 11 oxygens