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Presentation transcript:

Do Now: Explain this joke.

The last 2 weeks we have… investigated how evidence of chemical reactions indicates that new substances with different properties are formed.

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

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

Let’s make some visual models with SKITTLES 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 Green-Hydrogen Purple- Carbon

Review: How to make a molecule… Formula Visual model H2O Subscript No Subscript, There is only 1 atom of oxygen in the molecule

Review: How to make a molecule… Formula Visual model H2O No Subscript, There is only 1 atom of oxygen in the molecule Subscript H2O2

Review: How to make a molecule… Formula Visual model 6 H2O 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 SKITTLES… Reactants products Chemical equation C + O2  CO2 Visual model + Word equation To yield Number of atoms 1 atom carbon reacts with 1 molecule of oxygen 1 molecule of 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 + Word equation Number of atoms 1 molecule CO2 1 atom carbon + 1 molecule oxygen 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…

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?

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

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

6CO2+ 6H20+ Sun’s light C6H12O6+6O2 The above reaction… is photosynthesis Is respiration Transforms radiant energy into chemical energy Both a and c.

Organic Molecules all contain… Sulfur Carbon Oxygen nitrogen

All of the following are organic molecules except… C6H12O6 CH4 C6H6O H20