Firewood? Chapter 22. Formulas and Models for Methane and Ethane. One carbon atom can form a single covalent bond with four hydrogen atoms.
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1 Chapter 22 Gasoline, diesel fuel, and kerosene are examples of liquid fuels. A solid fuel, coal, produced the steam for the locomotives that pulled old-time trains. These fuels are mixtures of compounds called hydrocarbons. You will learn about the structure and properties of hydrocarbons. Firewood? Because carbon has four valence electrons, a carbon atom always forms four covalent bonds. One carbon atom can form a single covalent bond with four hydrogen atoms. a carbon atom always forms four covalent bonds. a carbon atom always forms four covalent bonds. a carbon atom always forms four covalent bonds. a carbon atom always forms four covalent bonds. Formulas and Models for Methane and Ethane Carbon atoms can bond to each other forming very large molecules. The simplest organic compounds contain only carbon and hydrogen and are called hydrocarbons. Ball-and-stick model Space-filling model 1
2 Three types of hydrocarbons are alkanes, alkenes and alkynes. An alkane is a hydrocarbon in which there are only single covalent bonds. The carbon atoms in an alkane can be arranged in a straight chain or in a chain that has branches. Straight-Chain Alkanes Ethane is the simplest of the straight-chain alkanes. The alkanes form a homologous series because there is a constant increment of change. Each member of this series has one more -CH 2 than the previous member. Note the change in boiling point as the molecules get bigger. Prefixes indicate the number of carbons (ref. table P). The suffix ane indicates the alkane series. Name the straight chain alkane with 3 carbons. Since all carbon to carbon bonds are single, they are called saturated (full of hydrogens). You can t add any more hydrogen. These hydrocarbons all have the same general formula, C n H 2n+2 (ref. table Q). 2
3 Hydrocarbons are used as fuels. Structural formulas show the2-d arrangement of atoms in a molecular formula. Since hydrocarbon formulas are typically so big, a condensed structural formula, can be used. Some bonds and/or atoms are left out of the structural formula and are understood to be present. Branched-Chain Alkanes An atom or group of atoms that can take the place of a hydrogen atom on a parent hydrocarbon molecule is called a substituent, or side-chain. A hydrocarbon side chain is called an alkyl group. When naming a branched alkane, the longest continuous chain of carbons is named. A prefix is used to indicate the number of carbons in the side chain and a number indicates which carbon the side chain is on. The chain is named so that the substituents receive the lowest possible numbers. 3
4 Ball-and-stick and space-filling models show the arrangement of atoms in 4-ethyl-2,3- dimethylheptane. Molecules of hydrocarbons, such as alkanes, are nonpolar molecules. The nonpolar molecules in the oil spill are not attracted to the polar water molecules in the ocean. Like dissolves like. 4
5 Roach traps are baited with pheromones, which roaches produce to attract mates. The structure of many pheromones is based on unsaturated hydrocarbons. You will study two types of unsaturated hydrocarbons alkenes and alkynes. Unsaturated hydrocarbons are not full of hydrogens. At least one carbon-carbon bond is a double or triple bond. In the alkene series there is at least one double bond. In the alkyne series there is at least one triple bond. Alkenes are hydrocarbons that contain one or more carbon-carbon double covalent bonds. They have 2 less hydrogens than alkanes and fit the general formula C n H 2n (ref table Q) Because rotation is restricted around the double bond, atoms in ethene lie in one plane. Ethene At least one carbon-carbon bond in an alkyne is a triple covalent bond. Other bonds may be single or double carbon-carbon bonds. Alkynes have 2 less hydrogens than alkenes, and the fit the general formula C n H 2n-2 (ref. table Q). The triple bond restricts rotation in an ethyne molecule, which has a linear shape. 5
6 The retinal molecule in the rod and cone cells of your eye has a hydrocarbon skeleton. When light strikes a cell containing retinal, it causes a change in the three-dimensional structure of the retinal molecule. The structures before and after the light strikes are examples of isomers. You will study different types of isomers. Compounds that have the same molecular formula but different molecular structures are called isomers. Structural isomers differ in physical properties such as boiling point and melting point. They also have different chemical reactivities. Both butane and 2-methylpropane have the molecular formula C 4 H 10. The atoms in their molecules are arranged in a different order, so they are structural isomers. Beta-carotene is an important nutrient in carrots that also gives carrots their orange color. The hydrocarbon skeleton of beta-carotene contains hydrocarbon rings. You will learn about hydrocarbon rings and the properties of compounds formed from these rings. Three Ways to Represent Cyclic Hydrocarbons In some hydrocarbon compounds, the carbon chain is in the form of a ring. Compounds that contain a hydrocarbon ring are called cyclic hydrocarbons. TNT 6
7 22.5 An artist imagines Saturn s moon Titan as a refueling station in space. A traveler would refill a fuel tank with hydrocarbons from Titan s atmosphere. On Earth, hydrocarbons are also used as fuels. You will learn about three fossil fuels natural gas, petroleum, and coal. Natural gas is an important source of alkanes of low molar mass. The most important component of natural gas, methane, burns with a clean, hot flame Wells are drilled to reach natural gas and petroleum. The refining process starts with the distillation of petroleum (crude oil) into fractions according to boiling point. Cracking is a controlled process by which hydrocarbons are broken down or rearranged into smaller, more useful molecules Refineries separate crude oil into various components. In fractional distillation, the crude oil is heated so that it vaporizes and rises through the fractionating column. The column is hotter at the bottom and cooler at the top. 7
8 22.5 8
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