ELEMENTS There are 92 elements found naturally The most common elements in living things are: Hydrogen (H) 59% Oxygen (O) 24% Carbon (C) 11% Nitrogen (N) 4% Others such as phosphorus (P) and sulphur (S) 2% combined

Law of Conversation of Matter Matter can not be created nor destroyed it is just converted to a different form. C6H12O6 – 24 total atoms 6 carbon atoms 12 hydrogen atoms 6 oxygen atoms

Photosynthesis 6CO2 + 6H2O + Energy C6H12O6 + 6O2 How many total atoms are there? _________ How many are there are each side? Balance the equation C = C = O = O = H = H = © 2004 Delmar Learning, a Division of Thomson Learning, Inc.

Compounds or Inorganic Compounds Organic Compounds usually don’t contain Carbon generally come from the earth generally simple molecules Usually ionic bonding always contain C & H and usually O, N, sometimes S & P originate in organisms generally complex molecules Usually covalent bonding

Examples of Inorganic Compounds H + O = H2O = Water H + Cl = HCl = Hydrochloric Acid C + O = CO2 = Carbon Dioxide Na + Cl = NaCl = Common Table Salt

What are the 6 most common elements found in all living things. a. Carbon, Helium, Nitrogen, Oxygen, Potassium and Sodium b. Carbon, Hydrogen, Nitrogen, Oxygen, Potassium and Sodium c. Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus and Sulfur d. Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus and Sodium

Examples of Organic Compounds C, H + O Carbohydrates = Sugars, starches & cellulose C, H + O Lipids = Fats & Oils C, H, O, N, & sometimes P + S Proteins C, H, O, N, + P Nucleic Acids – DNA & RNA

Find and circle the 6 most common elements found in living things