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CHEMISTRY

UNIT F322: Chains, Energy and Resources
Module 1: Basic Concepts and Hydrocarbons
2.1.1 Basic Concepts
2.1.2 Alkanes
2.1.3 Alkenes

Module 2: Alcohols, Halogenoalkanes and Analysis
2.2.1 Alcohols
2.2.2 Halogenoalkanes
2.2.3 Modern Analytical Techniques

Module 3: Energy
2.3.1 Enthalpy Changes
2.3.2 Rates and Equilibrium

Module 4: Resources
2.4.1 Chemistry of…

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Module 1
2.1.1 Basic Concepts
Formulae of Organic Compounds
Terms
- Empirical Formula: The simplest whole-number ratio of atoms of each element
present in a compound.
- Molecular Formula: The number of atoms of each element in a molecule, e.g.
propane C3H8.
- General Formula: The simplest algebraic formula of…

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Functional groups and the naming of organic
compounds
Terms
- Homologous series: A series of organic compounds with the same functional
group, but with each successive member differing by CH2.
- Functional group: The part of the organic molecule responsible for its chemical
reactions.

Need to know first 10 members…

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Isomerism
Terms
- Structural isomers: Molecules with the same molecular formula but with different
structural arrangements of atoms.
- Stereoisomers: Compounds with the same structural formula but with different
arrangement of the atoms in space.
- E/Z isomerism: A type of stereoisomerism in which different groups attached to
each C=C…

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Percentage Yield and Atom Economy
Percentage yield
actual amound, in mol, of product
% yield =theorectical amount, in mol, of product ×100



Atom Economy
molecular mass of the desired products
atom economy =
sum of molecular masses of all products ×100



- All addition reactions have a 100% atom economy…

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2.1.2 Alkanes

Alkanes and cycloalkanes are saturated hydrocarbons.


Hydrocarbons from Crude Oil
Terms
- Hydrocarbon: An organic compound of hydrogen and carbon only.
- Saturated hydrocarbon: A hydrocarbon with single bonds only
- Unsaturated hydrocarbon: A hydrocarbon containing carbon-to-carbon multiple
bonds, e.g. double bonds.
- Fractional distillation: The separation of…

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Hydrocarbons as fuels
The combustion of alkanes
- Short-chain alkanes are valuable as clean fuels. They burn in a plentiful supply of
oxygen to for carbon dioxide and water.
- Methane is the main constituent of natural gas and is used for domestic heating and
cooking.
- Complete combustion of…

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Producing cyclic hydrocarbons
Aliphatic hydrocarbons can be converted into cyclic or aromatic hydrocarbons in a process
sometimes known as reforming.




Improving fuels
- Research octane number (RON) rates how well a fuel burns. Fuels with near 100
ratings burn more efficiently. Heptane burns poorly and has an octane rating of…

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Halogenation of alkanes
Alkanes react with halogens in the presence of UV radiation or at a temperature of about
300°c. For example methane reacts with chlorine to produce chloromethane:
CH4 + Cl2 CH3Cl + HCl
This is radical substitution. Covalent bonds are broken by Homolytic fission to form
radicals. A…

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Properties of Alkanes
Term
- Pi( )-bond: the reactive part of a double bond formed above and below the plane of
the bonded atoms by the sideways overlap of p-orbitals.
- Sigma( )-bond
In the formation of the double bond:
- A -bond is formed directly between to carbon atoms…

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