1. Bell Ringer: Why is water considered a “polar” molecule?
Is the oxygen side positive or negative?
Is the hydrogen side positive or negative?
Define cohesion
Define adhesion

2. Joke of the Day:

3. Chemical Reactions and Enzymes
Reaction of sulfuric acid and sugar. The acid dehydrates the sugar forming a pillar of carbon (black) and steam.

4. Chemical Reaction
A Process that changes one set of chemicals into another set of chemicals.
Breaking bonds in the Reactants and the formation of new bonds in the Products
Atoms are REARRANGED not created or destroyed
Anabolic Rxn - reaction that makes complex molecules from smaller ones
Catabolic Rxn - reaction that breaks larger molecules into smaller ones with the release of energy

5. Reactants  Products Elements or compounds that
enter into a chemical reaction
Elements or compounds that
Are produced by a chemical
reaction

6. Energy in Reactions
Energy is released or absorbed whenever chemical bonds are formed or are broken.
Chemical Rxns that release energy often occur spontaneously.
3 Types of Energy that are released during a chemical rxn
Heat
Light
Sound

7. Activation Energy The energy that is needed to get a reaction started.-

8. Enzymes Catalyst A substance that speeds up the rate of a chemical rxn
Enzymes are proteins that act as biological catalysts
Cells use enzymes to speed up chemical rxns
Catalyst
A substance that speeds up the rate of a chemical rxn
They work by lowering a rxns required activation energy

9. Identify the “Good” side
Unit 2: Balancing Equations
The Steps…
Identify the “Good” side
Identify the first atom in the Good side and count them.
Balance that atom on the bad side by adding a coefficient.
Identify the second atom the Good side and count them.
……continue until you are done.
Examples:
_____CO _____H2O H2CO3
___CO2 + ___H2O C6H12O O2