H2OH2O Review: How to make a molecule… No Subscript, There is only 1 atom of oxygen in the molecule Subscript Visual modelFormula.

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Presentation transcript:

H2OH2O Review: How to make a molecule… No Subscript, There is only 1 atom of oxygen in the molecule Subscript Visual modelFormula

H2OH2O Review: How to make a molecule… No Subscript, There is only 1 atom of oxygen in the molecule Subscript Visual modelFormula H2O2H2O2

6 H 2 O Review: How to make a molecule… Visual modelFormula Coefficient- How many molecules you have.

H2OH2O 1 molecule of H 2 O

3 H 2 O 3 molecules of H 2 O

Let’s now model another chemical equation with our M&M’s… Reactantsproducts Chemical equation C + O 2  CO 2 Visual model +  Word equation To yield Number of atoms  1 atom carbon react with 1 molecule oxygen 1 molecule CO 2 1 carbon 2 oxygen

Is it a balanced equation? How do we know? Reactantsproducts Chemical equation C + O 2  CO 2 Visual model +  Word equation  Number of atoms 1 atom carbon + 1 molecule oxygen 1 molecule CO 2 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)precipitate A change in color

More practice… Reactantsproducts Chemical equation 2C + 2O 2  3CO 2 Visual model +  Word equation To yield Number of atoms 2 atoms carbon react with 2 molecule oxygen 3 molecules CO 2 Is it balanced? 2 carbons 4 oxygen3 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.H 2 O b.2OH c.HOOH d.H 2 O 2

The above model shows: a.10 atoms b.2 molecules c.2CH 3 Cl d.All of the above

6CO 2 + 6H 2 0+ Sun’s light  C 6 H 12 O 6 +6O 2 The above reaction… a.is photosynthesis b.Is respiration c.Transforms radiant energy into chemical energy d.Both a and c.

Organic Molecules all contain… a.Sulfur b.Carbon c.Oxygen d.nitrogen Correct!

All of the following are organic molecules except… a.C 6 H 12 O 6 b.CH 4 c.C 6 H 6 O d.H 2 0

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)precipitate A change in color A change in odor

A chemical equation tells the story of a chemical reaction. Our combustion reaction again… Reactantsproducts Physical properties White crystal To yield Black crystal/powder Gas produced Chemical equation C 12 H 22 O O 2  12 CO H 2 O Visual model +  + Number of atoms 12 atoms carbon+ 22 atoms hydrogen+ 35 oxygen atoms 

Chemical Reaction Dehydration of sugar… Reactantsproducts Physical properties White crystal To yield Black crystal/powder and white gas Chemical equation C 12 H 22 O 11  12 C + 11 H 2 O (vapor) Visual model  + Number of atoms 12 carbons 22 Hydrogen 11 oxygen  12 carbons 22 hydrogens 11 oxygens