Interest Grabber What’s the Matter? All of the materials around you are made up of matter. You are made up of matter, as are the chair you sit on and the air you breathe. 1. Give an example of solid matter. 2. Give an example of liquid matter. 3. Give an example of gaseous matter. 4. Is all matter visible? 5. Does all matter take up space? made of protons (+), neutrons, and electrons (-) element = pure substance consisting of only one type of atom compound = chemical combination of two or more elements An Element in the Periodic Table AN ELEMENT IN THE PERIODIC TABLE Section 2-1 6 C Carbon 12.011 6 electrons 6 protons 6 neutrons electrons = protons = atomic number Atomic mass - # electrons = neutrons Figure 2-2 Isotopes of Carbon ISOTOPES OF CARBON Section 2-1 Vary in the number of neutrons Nonradioactive carbon-12 Nonradioactive carbon-13 6 electrons 6 protons 6 neutrons 6 electrons 6 protons 7 neutrons Radioactive carbon-14 6 electrons 6 protons 8 neutrons Ionic Bonds electrons transferred from one atom to another anion = - charge cation = + charge Covalent Bonds electrons shared by atoms molecule is smallest unit of most compounds Van der Waals Forces sharing of electrons not always equal areas of molecule may have slight charge that can lead to slight attraction if in close proximity weak but can hold large molecules together geckos Hydrogen Bonds see water info single most abundant compound in most living things greatest solvent on Earth Polarity Water molecule is polar because there is an uneven distribution of electrons between the oxygen and hydrogen atoms Oxygen has a slight (-) charge; Hydrogen has slight (+) charge like a magnet with 2 poles Attraction between the hydrogen of one water and the oxygen of another. Allows for cohesion and adhesion Because of polarity, hydrogen bonds usually form between oxygen, fluorine and nitrogen not as strong as covalent or ionic bonds because water is polar it is able to form multiple hydrogen bonds – accounts for many of water’s special properties expands slightly upon freezing ice less dense than water Hydrogen bonds allow water to dissolve many substances – critical to living cells Cohesion – attraction between molecules of the same substance water is extremely cohesive creates surface tension Adhesion – attraction between molecules of different substances water will adhere to the walls of a glass container ice is less dense than water so it floats on top floating ice insulates the water underneath and prevents it from freezing allows aquatic organisms that live in the water to survive during cold weather Heat capacity amount of heat energy needed to increase temperature requires large amount of heat to speed up molecules [raises temp] heat capacity for water is high body of water can absorb large amounts of heat without large temp changes What are the benefits to this? composed of solute and solvent solvent – substance in which solute dissolves solute – substance that is dissolved water and non dissolved material movement of water molecules keep small particles suspended blood water with blood cells and other undissolved particles H2O H+ + OH pH Scale pH SCALE water Increasingly Basic Oven cleaner Increasingly Acidic Neutral hydrogen ion hydroxide ion Bleach Ammonia solution Soap pH scale indicates the concentration of H+ ions Sea water Human blood Pure water Milk Normal rainfall Acid rain Tomato juice Lemon juice Stomach acid Acid = contain higher concentrations of H+ ions than pure water pH value below 7 Base = lower concentrations of H+ ions than pure water pH value above 7 weak acids and bases that react with strong acids and bases to prevent sudden changes in pH blood pH = 7.4 changes prevented by buffers such as bicarbonate and phosphate ions buffers play important role in homeostasis Organic Compounds all contain the element carbon study of organic compounds known as organic chemistry 4 groups Carbohydrates Lipids Proteins Nucleic Acids Figure 2-11 Carbon Compounds CARBON COMPOUNDS Section 2-3 STRUCTURAL FORMULAS Methane Acetylene Butadiene Benzene Isooctane composed of carbon, hydrogen and oxygen main source of energy for all living things also used for structural purposes (cellulose) Terminology monosaccharides simple sugars ex. Glucose, fructose C6H12O6 building blocks of complex carbs disaccharides double sugars ex. Sucrose, lactose, maltose C12H22O11 glucose + fructose = sucrose glucose + glucose = maltose Polysaccharides complex sugars plants store sugar as starch animals store sugar as glycogen cellulose starch used for structural purposes in plants [cell wall] Includes fats, waxes, oils fats solid at room temp, produced by animals (except fish) saturated fats – cause heart disease oils liquid at room temp, produced by plants unsaturated fats – better for you a few plant oils are saturated – coconut oil waxes plants and animals stored as energy reserves part of biological membranes and waterproofing composed of fatty acid & glycerol molecules building blocks of living material important in growth, maintenance, & repair help run chemical reactions made up of amino acids 20 of them amino acids joined by peptide bonds dipeptide = 2 amino acids polypeptide = many amino acids examples of amino acids = valine, lysine, glycine 4 Levels Primary sequence of amino acids Secondary folding and coiling of the chain Tertiary three-dimensional arrangement Quaternary found in proteins with more than one polypeptide (chain) most complex biological compounds DNA deoxyribonucleic acid RNA ribonucleic acid control heredity composed of nucleotides which have 3 parts: 5 carbon sugar nitrogen base phosphate group Nucleotide Monomer = smallest unit into which an organic compound can be broken carbohydrates = monosaccharides lipids = fatty acids and glycerol proteins = amino acids nucleic acids = nucleotides Concept Map CONCEPT MAP FOR CARBON COMPOUNDS Section 2-3 Carbon Compounds include Carbohydrates Lipids Nucleic acids Proteins that consist of that consist of that consist of that consist of Sugars and starches Fats and oils Nucleotides Amino Acids which contain which contain Carbon, hydrogen, oxygen Carbon, hydrogen, oxygen which contain which contain Carbon,hydrogen, oxygen, nitrogen, phosphorus Carbon, hydrogen,oxygen, nitrogen,