Chemistry of Life 10/1/2010. What makes up the chemistry of life?
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1 A. Students will be able to identify and define the parts of an atom. Chemistry of Life At the Completion of this Unit, Students will be able to: A. Identify and define the parts of an atom. B. Demonstrate how to use the Periodic Table of Elements D. Explain the properties of water.. G. Explain the role of enzymes. What makes up the chemistry of life? The study of chemistry begins with the basic unit of matter, the atom. The Greek word atomos, which means unable to cut. This word was first used nearly 2500 years ago by Greek philosopher Democritus. Democritus asked a simple question If you take an object like chalk and break it in half are both pieces still chalk? Yes, suppose you break the chalk down again and again and again. Can you continue to divide without limit? Or is there a limit? Democritus thought their was a limit. Democritus called the smallest fragment the atom, a name scientists use today. A. Identify and define the parts of an atom.. Chemistry of Life Atoms the SMALLEST particle that can exist and still be considered a certain kind of matter All LIVING and NONLIVING things are made of atoms A. Identify and define the parts of an atom.. Atoms -- have three components ELECTRONS negatively charged; surround nucleus PROTONS -- positively charged; found in nucleus NEUTRONS -- neutral; found in nucleus A. Identify and define the parts of an atom.. B. Demonstrate how to use the Periodic Table of Elements Electrons Protons& Neutrons (Nucleus) Energy Levels 1
2 B. Demonstrate how to use the Periodic Table of Elements 6 C Carbon 12 Atomic Number = # of Protons and # of Electrons Chemical Symbol Chemical Name Atomic Weight= # of Protons + Neutrons B. Demonstrate how to use the Periodic Table of Elements 6 Atomic Number = # of Protons and # of Electrons CCarbon 12 Chemical Symbol Chemical Name Atomic Weight= # of Protons + Neutrons Remember: No more than 2 electrons on first ring, No more than 8 on second P= 6 E=6 N= 6 (Atomic Weight- Atomic # = Neutrons) Chemistry of Life Elements -- a substance that is made of only ONE kind of ATOM Major Elements of Life C = Carbon H = Hydrogen O = Oxygen P = Phosphorus K = Potassium Major Elements of Life I = Iodine N = Nitrogen S = Sulfur Ca = Calcium Major Elements of Life Fe = Iron Mg = Magnesium Na = Sodium Cl = Chlorine 2
3 Where do we find these elements? Major Elements in Human Body In all living and nonliving things. Chemistry of Life Compounds matter that is made of more than ONE kind of ATOM Compounds are made by atoms sharing or taking ELECTRONS from the other atoms in the compound Compound Example Water ( H 2 O ) each molecule is made of two HYDROGEN atoms and one OXYGEN atom Water Molecule Chemical Bonds The main types of Chemical Bonds in a compound are: Ionic Bonds Covalent Bonds 3
4 Ionic Bonds Ionic Bond Example An IONIC BOND is formed when one or more electrons are transferred from one atom to another. Covalent Bonds A COVALENT BOND is formed when electrons are shared between atoms. Covalent Bond Example Single bond: Share two electrons double bond: Share four electrons Triple bond: Atoms share six or more electrons MOLECULE. The structure that results when atoms are joined together by a covalent bond C. List the major chemical elements and compounds The Water Molecule One atom of oxygen binds to two atoms of hydrogen to form H20. Like all molecules a water molecule (H 2 0) is neutral. Water molecules are held together by a hydrogen bond. Hydrogen Bonds are not as strong as covalent or ionic bonds. The hydrogen atoms are attached to one side of the oxygen atom, resulting in a water molecule having a positive charge on the side where the hydrogen atoms are and a negative charge on the other side, where the oxygen atom is. Since opposites attract, water molecules tend to attract each other, making water kind of "sticky." C. List the major chemical elements and compounds The Water Molecule 4
5 D. Explain the properties of water. Properties of Water Cohesion is an attraction between molecules of the same substance. Example: molecules on the surface of water are drawn inward, forming drops and beads D. Explain the properties of water. Properties of Water Adhesion is an attraction between molecules of different substances. Example: Water clinging to paper towel. Capillary action is one of the forces that draws water out of the roots of a plant and up into it s stems and leaves. (Cohesion holds the column of water together as it rises) D. Explain the properties of water. Properties of Water Lab Why is water so important to agriculture? At least 75% of animal body mass is water Plants contain 70-80% water Transports nutrients and wastes Why is water so important to agriculture? Dissolves compounds -- Universal Solvent Regulates body temperature in animals Provides structure for plants What is this? 5
6 How much milk does she produce daily? pounds per day 8 pounds per gallon How much WATER does a milk cow drink daily? 2 gallons of water to produce 1 gallon of milk Remember pounds per day 8 pounds per gallon gallons Macromolecules= A Very Large Molecule Remember Molecules are structures that are made when atoms are joined by a covalent bond. Vs Macromolecules= A Very Large Molecule Proteins Lipids Nucleic Acids Provide energy Three Types Monosaccharides Disaccharides Polysaccharides 6
7 Monosaccharides simple SUGAR contain C 6 H 12 O 6 Examples: GLUCOSE, FRUCTOSE, AND GALACTOSE Disaccharides double SUGAR contain two RINGS SUCROSE and LACTOSE Polysaccharides complex CARBOHYDRATES made of RINGS of SUGAR Example: STARCH, CELLULOSE, and GLYCOGEN Proteins STRUCTURE and FUNCTION Made of H, O, C, N Proteins Structure of Proteins Amino Acids building BLOCKS 20 different kinds all have the same elements but in different amounts Polypeptides chains of AMINO ACIDS Joined by peptide bonds Proteins chains of POLYPEPTIDES Used to make SKIN, HAIR, MUSCLE, ORGANS, etc. 7
8 Beef Carbon Atoms Chemical Bonds Protein Lipids FATTY molecules used to store ENERGY Do not DISSOLVE in WATER Lipids have less OXYGEN than carbohydrates Examples of Lipids are: FATS, OILS, AND WAXES Nucleic Acids Store INFORMATION that controls CELL activities Made of a PHOSPHATE SUGAR, and a BASE. Examples of Nucleic Acids are: DNA and RNA G. Explain the role of enzymes. Enzymes Cells use enzymes to speed up chemical reactions that take place in cells. Enzymes must collide with enough energy to break bonds creating chemical reactions. Chemical reactions create energy. 8
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