3. Organic Molecules Carbon = building block of organic molecules Carbon is unique – Unstable: 2 nd level not full – Will bond up to four times 1 2 3 4 1 2 6 protons 6 electrons

4. Organic Molecules Carbon = building block of organic molecules Carbon is unique – Unstable: 2 nd level not full – Will bond up to four times Monomer: Small carbon molecules – Ex: Amino acid Polymer: chain of linked monomers – Ex: Protein monomer Polymer

5. Is Carbon stable with 4 electrons in its outer layer? Is Hydrogen stable with 1 electron in its layer? So what do atoms do when they are unstable? Problem: Drawing dot diagrams is time consuming. Try this instead! 1 dash = 2 electrons

6. The Same Thing… 1 dash = 2 electrons

7. Carbon creates 4 bonds to be stable Double bonds Triple bonds Ring structures Single bonds Very complex How many electrons? 1 Dash = 2 electrons

8. Carbohydrates Readily available food source C 1 : H 2 : O 1 ratio – Ex: Glucose = C 6 H 12 O 6 Monomer: Monosaccharides – Simple sugars – Bond to form larger sugars Polymer: Polysaccharide – Complex sugars Glucose (monosaccharide) Fructose (monosaccharide) Sucrose (Polysaccharide)

9. Opposite Reactions Dehydration synthesis – Water molecule (H2O) removed – Causes monomers to bond into polymers (large molecules built) Monomer 1Monomer 2 Polysaccharide water

10. Opposite Reactions Dehydration synthesis – Water molecule (H2O) removed – Causes monomers to bond into polymers (large molecules built) Hydrolysis – Water molecule (H2O) added – Causes polymers to break into monomers (large molecule broken apart) All organic molecules built/reduced by these reactions PolysaccharideWater Monomer 1 Monomer 2

11. Opposite Reactions

12. Carbohydrate Polymers: Polysaccharide Polysaccharides: Long chain of monosaccharides Ex: Starch: excess plant sugar converted & stored Ex: Glycogen: animal starch stored in liver & muscles Ex: Cellulose: used in plants to make cell walls glucose

13. Chapter 2 Free Response Test Question Version A: Diagram the process of hydrolysis using a sugar as an example. Be sure to indicate the following: a.Original molecules b.End molecules c.Label all parts, including the bond atoms Version B: Diagram the process of dehydration synthesis using a sugar as an example. Be sure to indicate the following: a.Original molecules b.End molecules c.Label all parts, including the bond atoms

14. Kobe Kuiz 1)How many electrons does Carbon have in the 1 st energy level? 2 nd energy level? 2)Which type of organic molecule is most commonly used as energy for cells? 3)If a carbohydrate has 8 carbon atoms, how many oxygen and hydrogen atoms will it most likely contain? 4)What are the monomers of carbohydrates called? 5)What are the polymers of carbohydrates called? 6)How does dehydration and hydrolysis differ? 7)Which polymer is stored by animals? 8)Which polymer is stored by plants?