CH 2010 Exam 1 Study Guide
CH 2010 Exam 1 Study Guide CH 2010
Popular in Survey of Organic Chemistry
verified elite notetaker
Popular in Chemistry
This 5 page Study Guide was uploaded by Sara Littlejohn on Wednesday September 7, 2016. The Study Guide belongs to CH 2010 at Clemson University taught by Dr. Thomas Hickman in Fall 2016. Since its upload, it has received 64 views. For similar materials see Survey of Organic Chemistry in Chemistry at Clemson University.
Reviews for CH 2010 Exam 1 Study Guide
Report this Material
What is Karma?
Karma is the currency of StudySoup.
You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!
Date Created: 09/07/16
CH 2020 Exam 1 Study Guide Chapter 1 Bonding and Isomerism - Bonding Patterns o Hydrogen likes to form 1 bond. o Oxygen like to form 2 bonds. o Nitrogen likes to form 3 bonds. o Carbon likes to form 4 bonds. o Halogens like to form 1 bond. - Be able to draw Lewis Dot Structures (LDS) for all types of molecules o Make sure the octet rule is followed for every atom o Make sure the total number of valence electrons in the LDS add up to the number of electrons you calculated o DON’T FORGET LONE PAIRS - Formal Charge (FC) o The charge an atom appears to have when considering that all bonding electrons ae shared equally o To calculate formal charge, take the number of valence electrons from the periodic table and subtract the number of electrons surrounding the atom. Resonance Structures and Multiple Bonds - Electronegativity is an atoms willingness to adopt an electron. o It increases up and to the right o Fluorine is the most electronegative atom - Bond-Line Formulas (Skeletal/Polygon) o Shows carbon Skelton o Lines are drawn in a zigzag format so every end intersection represents a carbon o Omit the H atoms o Include functional groups o REMEMBER EACH CARBON GETS 4 BONDS - Drawing Resonance structures o Arrows are used to show electron involvement Move electrons toward the positive charge and away from the negative charge Only pi electrons or lone pair electrons (not sigma electrons or atoms) may be shifted only to adjacent atoms or bond positions From pi bond to adjacent bond From pi bond to adjacent atom From an atom (lone pair) to an adjacent bond Resonance structures in which an atom carries more than its quota of electrons (8 for C, N, O, F) are NOT contributors to the real structure. The more important RS (Resonance Structure) (major vs. minor) show each atom with a complete octet and as little charge separation as possible. Functional Groups o Be able to identify and name functional groups Acids and Bases o Bronsted-Lowry Theory Strong bases produce weak acids Strong acids produce weak bases o Strong and Weak acids and bases Strong acids undergo complete dissociation Weak acids undergo partial dissociation o Bases Classified as strong or weak based on their affinity for H+ o Amines Similar to ammonia Weak bases Undergo reversible reactions A strong acid can drive it to completion o Carboxylic Acids Weak acids Can be driven to completion by a strong base o pH and pKa the lower the pKa the more acidic o Organic Acids and Bases Carboxylic Acids pKa values from 4-5 Alcohols pKa values from 15-19 Amines pKa values from 35-40 Protonated Nitrogen pKa values around 10 Protonated Oxygen pKa values around -2 Equilibrium o REMEMBER: when drawing arrows to show how the products of a reaction are formed, they always go from ELECTRONS TO THE H and then from the BOND TO THE ATOM o The reaction is always favored from the Strong Acid to the Weak Acid o Acidity increases as pKa decreases Factors Affecting Acidity (ARIO) o Atom Size: the larger atom disperses the negative charge over a larger region Electronegativity: the more electronegative atom can carry the negative more readily o Resonance If the conjugate base of an acid is able to move the negative charge to other atoms it is more stable, making the acid more acidic o Inductive effect Election withdrawing groups (EWG) can disperse the negative charge, making the compound more acidic The closer an electronegative atom is to the negative sign the more acidic the compound o Orbital (Hybridization) The less electron domains the more acidic The less p’s in the hybridization the more acidic Acid-Base properties of amino acids o If the pH of a solution is less than pKa, the proton is ON o If the pH of a solution is greater than the pKa, the proton is OFF o Electrophoresis: separation of amino acids Chapter 2 Alkanes Structural Isomers - Compounds with the same molecular formula and different connectivity - Longer chains have more contact with each other, which gives them a higher boiling point Alkanes and Cycloalkanes - Compounds with no double bonds are called saturated hydrocarbons - Compounds with double bonds are called saturated hydrocarbons - All have the –ane ending - “cyclo” means ring - Naming alkanes: o Count the number of carbons on the longest chain This gives you the pre fix you need to go with –ane If the molecule contains a double bond it has to be counted as part of the longest chain o Give the any remaining substituents a name based on the table below and describe their place o Remember to separate numbers with commas and letters from numbers with a hyphen Physical Properties - The longer the chain (more contact area) the higher the boiling point o The more compact a molecule is the harder it is for the molecules to connect, making it easier to break them apart, resulting in a lower boiling point o Oxygen forms stronger H-bonds than Nitrogen Reactions of Alkanes - Two primary reactions o Combustion oxidation o Halogenation In the presence of uv light, the reactants produce a free radical Free radical mechanism Arrows must be drawn with 1 barb 3 stages: o Initiation o Propagation Becomes a cycle o Termination: Coupling Free radicals can do 3 things: o Couple o Abstract H-atoms o Add to a double bond Free Radical Stability o Treat radicals like C+ atoms
Are you sure you want to buy this material for
You're already Subscribed!
Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'