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Slide 1 - Hydrocarbons / Organic Chemistry
Slide 2 - Organic Chemistry Organic chemistry is the study of the structure, properties, composition, reactions, and preparation of the chemical compounds that contain carbon.
Slide 3 - Hydrocarbons Hydrocarbons are molecules which contain hydrogen and carbon There are many different compounds that can form with carbon and hydrogen There are 3 main hydrocarbon families Alkane Alkene Alkyne
Slide 4 - Where do you find hydrocarbons? Carbon compounds make up 90% of all chemical compounds and many form the basis of living systems The majority of hydrocarbons found naturally occur in crude oil Crude oil forms from decomposed organic matter which has lots of carbon and hydrogen!. Proteins, carbohydrates and fats all contain carbon, hydrogen and oxygen
Slide 5 - What are the differences and similarities of the compounds below
Slide 6 - 1. Alkanes Are hydrocarbons that contain only carbon and hydrogen They only have single bonds CnH2n + 2 A series of compounds with similar properties in which each member differs from the previous one by –CH2 is known as a homologous series Structural formulas show the number and location of bonds but not lone pairs
Slide 7 - Straight and branched chain A straight-chain is where the carbon atoms in an alkane, alkene and alkyne form a chain that runs from one end of the molecule to the other. A branched chain is were an alkane, alkene and alkyne has alkyl groups bonded to its central carbon chain. An alkyl is a group of atoms consisting of carbon and hydrogen atoms, arranged in a chain.
Slide 8 - ppt slide no 8 content not found
Slide 9 - Naming carbon compounds
Slide 10 - What are the differences and similarities of the compounds below
Slide 11 - 2. Alkenes Contains at least one carbon to carbon double bond The alkenes are a homologous series CnH2n n = integer
Slide 12 - Naming Alkenes Carbon atoms are labelled from left to right Identify where the double bond starts And put that number between the prefix and suffix of the alkene But-1-ene But-2-ene
Slide 13 - Naming alkenes with 2 double bonds If there are two double bonds the suffix (ending) is -diene 3 double bonds -triene buta-1, 2-diene
Slide 14 - 3. Alkynes Are hydrocarbons that contain only carbon and hydrogen They have at least one triple bond The alkynes are a homologous series
Slide 15 - ppt slide no 15 content not found
Slide 16 - Naming carbon compounds
Slide 17 - Structural isomers Structural isomers are molecules with the same molecular formula but different arrangement of their atoms (different structural formulas)
Slide 18 - Structural Isomers
Slide 19 - Structural isomers
Slide 20 - Semi-structural formulas Semi- structural formula is a structural formula without giving the arrangement atoms in space
Slide 21 - Make and then draw as many isomers of hexane as possible
Slide 22 - ppt slide no 22 content not found
Slide 23 - Naming isomers 1. Name and number longest carbon chain (circle it) 2. Identify branches (there are no branches at ends!) 3. Name each branch (alkyl group) put them in alphabetical order methyl CH3 ethyl C2H5 propyl C3H7 butyl C4H9 pentyl C5H11 4. If there is more than 1 alkyl group use: di = 2, tri = 3, tetra = 4 as a prefix e.g. diethyl, trimethyl 5. Write the number of the carbon atom each alkyl group is attached to. Put commas between numbers if there is more than one alkyl group (2,3-dimethyl) 6. Put hyphens between numbers and words (2,2 – dimethylbutane)
Slide 24 - Name the following n 2-methyl propane propane
Slide 25 - Name the following carbon compounds 5-ethyl-5,6,6-trimethyl decane 4,5-diethyl-5,6-dimethyl-4-propyloctane
Slide 26 - Are these named correctly? Rewrite the names that are incorrect
Slide 27 - Name all the isomers of hexane you drew
Slide 28 - Saturated compounds A saturated compound has no double or triple bonds. In saturated linear hydrocarbons, every carbon atom is attached to two hydrogen atoms, except those at the ends of the chain, which have three hydrogen atoms. In the case of saturated methane, four hydrogen atoms are attached to the single, central carbon atom. Of simple hydrocarbons, alkanes are saturated, and alkenes are unsaturated.
Slide 29 - Unsaturated carbon compounds Alkenes and alkynes are unsaturated carbon compounds because they contain less hydrogen than the maximum amount possible
Slide 30 - Which compound/s are saturated? v
Slide 31 - Physical Properties of Alkanes and Alkenes As the number of carbon atoms increases in a homologous series there is a change in the physical properties At room temperature, the lighter alkanes and alkenes are gases; the midweight alkanes are liquids; and the heavier alkanes are solids, or tars. Why? London forces increase as molecules get heavier
Slide 32 - Boiling Point The boiling points of the alkanes and alkenes gradually increase with the molecular weight of the compounds. Alkanes and alkenes have similar boiling points Alkenes have a slightly lower
Slide 33 - Volatility Volatile liquids are those that evaporate (go from liquid to solid) easily. Smaller molecules are more volatile Why? Because there are weak London forces so it is easier for them to go from a liquid to a gas
Slide 34 - Viscosity Viscosity is the measure of the thickness of a fluid Honey is more viscose (it is harder to pour) than water The larger the molecule the more viscous it is The larger the molecule the stronger the London forces which means they are more likely to stick together because they are long they get tangled up like spaghetti
Slide 35 - Hydrocarbon Solubility The rule to use when determining hydrocarbon solubility is: Like dissolves like. This means that polar compounds (water, and alcohols) dissolve other polar compounds. Nonpolar compounds dissolve other nonpolar compounds but tend not to dissolve polar compounds.
Slide 36 - Chemical Properties of Alkanes Alkanes burn in oxygen this is called a combustion reaction The reactants are hydrocarbon and oxygen The products are water and carbon dioxide
Slide 37 - Combustion reaction Combustion reactions are whats causing global warming! Petrol, made up of hydrocarbons combusts in cars engines
Slide 38 - Chemical Properties of Alkenes Alkenes have different chemical properties to alkanes due to the double bonds in alkenes Alkenes react much more readily than alkanes
Slide 39 - Reaction with bromine solution Ethene reacts with bromine and bromine is added to the ethene molecule. Ethene loses its double bond This is called an addition reaction because bromine is added to ethene
Slide 40 - Reaction with bromine solution This is used to test for unsaturation If the solution is unsaturated the red brown colour of bromine disappears The red brown colour disappears becasue the bromine becomes part of the ethene molecule Permanganate solution is also used to test for unsaturation
Slide 41 - Test for unsaturation Bromine does not react with an alkane because the alkane contains only single C-C bonds which cannot add the bromine. Alkanes merely dilute the red-brown bromine color to an orange or yellow color Due to their C=C double bonds which can be broken, alkenes react readily with bromine to produce saturated dibromoalkanes.
Slide 42 - Reaction of alkane with halogens The reaction of alkanes follows the general rule Br2 + alkane  alkane–Br + HBr
Slide 43 - Ethene and Hydrogen reaction Ethene reacts with hydrogen gas to form ethane This is an example of an addition reaction
Slide 44 - Reaction with steam Ethene reacted with steam (water) forms ethanol
Slide 45 - Functional groups aside from alkyl groups OH, hydroxy alkanol
Slide 46 - http://www.sciencegeek.net/APchemistry/APtaters/alkanes.htm