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Monday, 3 September 2018

Lesson 7: Organic Chemistry
Under this topic we will look at the homologous series one after the other, I mean the alkane, alkene, alkyne and so on. One after the other, there method of production, physical and chemical properties, test and uses.

INTRODUCTION
What is organic chemistry?
This is the branch of chemistry that deals with the compound of hydrocarbons.
Types of organic compounds
There are two major types of hydrocarbon which are
1.      Aliphatic hydrocarbon: these are the hydrocarbon that are made up of straight, branched or cyclic carbon atoms.   
2.      Aromatic hydrocarbon : these are the hydrocarbon that contains ring structure of carbon with Non- localized orbital. i.e. non-localized pi bond e.g. benzene, phenol, toluene and turpentine.
Aliphatic hydrocarbon carbon grouped into:
a.       Acyclic hydrocarbon: these are hydrocarbon with straight chain e.g. ALKANE and ALKENE   
b.      Cyclic hydrocarbons: these are hydrocarbons in cyclic form. e.g. Cyclo-pentane, Cyclo-hexane. They only form ring structures with single bond.
Acyclic can be group as saturated and unsaturated hydrocarbons
a.       Saturated hydrocarbons: these are hydrocarbons with single covalent bond e.g. the ALKANE family.
b.      Unsaturated hydrocarbons: these are hydrocarbons with double or triple covalent bond. E.g. ALKENES and ALKYNES.

CHEMISTRY OF ALKANE
            Alkanes are saturated, acyclic, aliphatic hydrocarbon with the general formula CnH2n+2. Where is an integer starting from 1.the functional group of alkane is (C-C).

THE FIRST TEN MEMBER OF THE FAMILY ARE:
Number of carbon
Name
Molecular Formula
1
Methane
CH4
2
Ethane
C2H6
3
Propane
C3H8
4
Butane
C4H10
5
Pentane
C5H12
6
Hexane
C6H14
7
Heptane
C7H16
8
Octane
C8H18
9
Nonane
C9H20
10
Decane
C10H22


MOLECULAR STRUCTURE
Name
Molecular Formula
Condensed structure
Methane
CH4
CH4
Ethane
C2H6
CH3-CH3
Propane
C3H8
CH3-CH2-CH3
Butane
C4H10
CH3-CH2-CH2-CH3
Pentane
C5H12
CH3-CH2-CH2-CH2-CH3
Hexane
C6H14
CH3-CH2-CH2-CH2-CH2-CH3
Heptane
C7H16
CH3-CH2-CH2-CH2-CH2-CH2-CH3
Octane
C8H18
CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH3
Nonane
C9H20
CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH3
Decane
C10H22
CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH3

 General Laboratory preparation alkane
Alkane are generally prepared in the laboratory by heating the mixture of  Alkanoate (salt made from Alkanoic acid and sodium metal like sodiumthanoate, sodiumpropanoate, sodiumbutanoate. E.t.c.) salt with soda lime (CaHNaO2).

GENERAL PHYSICAL PROPERTIES OF ALKANE
1.      Methane and ethane are gas at room temperature, propane and butane are liquid at room temperature while others are solid
2.      They have no action on litmus paper
3.      They are slightly soluble in water. Solubility decreases as the the number of carbon atom increases.
GENERAL CHEMICAL PROPERTIES
1.      Combustion reaction: all alkane burns in air with a blue non-luminous flame to give carbon(iv)oxide and water. E.g. CH4 + 2O→ CO2 + 2H2O
2.      Substitution reaction: substitution reaction is a kind of chemical reaction whereby an atom or a group of atom is replace by another atom of group of atom. Alkanes can undergo substitution reaction with the halogens. And the reaction is also called halogenation. For example methane undergoes substitution reaction with chlorine to give choloro-methane in the presence of sunlight.
Chemical test for alkane
1.      All members of alkane has no effect on bromine water
2.      All members of alkane has no effect on acidified and alkalined potassium heptaoxodichromate(vi). (K2Cr2O7) and potassium tetraoxomanganates (vii).(KMnO4).

USES OF ALKANES
1.      They can be used as fuel
2.      Methane is used in the production of water gas
3.      They can be used in the production of hydrogen, alkynes, chloroform and so on.

4.      Tetrachloromethane is used as organic solvent in industries for manufacturing process.

Monday, 19 December 2016

Organic Chemistry

Lesson 7: Organic Chemistry
Under this topic we will look at the homologous series one after the other, I mean the alkane, alkene, alkyne and so on. One after the other, there method of production, physical and chemical properties, test and uses.

INTRODUCTION
What is organic chemistry?
This is the branch of chemistry that deals with the compound of hydrocarbons.
Types of organic compounds
There are two major types of hydrocarbon which are
1.      Aliphatic hydrocarbon: these are the hydrocarbon that are made up of straight, branched or cyclic carbon atoms.   
2.      Aromatic hydrocarbon : these are the hydrocarbon that contains ring structure of carbon with Non- localized orbital. i.e. non-localized pi bond e.g. benzene, phenol, toluene and turpentine.
Aliphatic hydrocarbon carbon grouped into:
a.       Acyclic hydrocarbon: these are hydrocarbon with straight chain e.g. ALKANE and ALKENE   
b.      Cyclic hydrocarbons: these are hydrocarbons in cyclic form. e.g. Cyclo-pentane, Cyclo-hexane. They only form ring structures with single bond.
Acyclic can be group as saturated and unsaturated hydrocarbons
a.       Saturated hydrocarbons: these are hydrocarbons with single covalent bond e.g. the ALKANE family.
b.      Unsaturated hydrocarbons: these are hydrocarbons with double or triple covalent bond. E.g. ALKENES and ALKYNES.

CHEMISTRY OF ALKANE
            Alkanes are saturated, acyclic, aliphatic hydrocarbon with the general formula CnH2n+2. Where is an integer starting from 1.the functional group of alkane is (C-C).

THE FIRST TEN MEMBER OF THE FAMILY ARE:
Number of carbon
Name
Molecular Formula
1
Methane
CH4
2
Ethane
C2H6
3
Propane
C3H8
4
Butane
C4H10
5
Pentane
C5H12
6
Hexane
C6H14
7
Heptane
C7H16
8
Octane
C8H18
9
Nonane
C9H20
10
Decane
C10H22


MOLECULAR STRUCTURE
Name
Molecular Formula
Condensed structure
Methane
CH4
CH4
Ethane
C2H6
CH3-CH3
Propane
C3H8
CH3-CH2-CH3
Butane
C4H10
CH3-CH2-CH2-CH3
Pentane
C5H12
CH3-CH2-CH2-CH2-CH3
Hexane
C6H14
CH3-CH2-CH2-CH2-CH2-CH3
Heptane
C7H16
CH3-CH2-CH2-CH2-CH2-CH2-CH3
Octane
C8H18
CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH3
Nonane
C9H20
CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH3
Decane
C10H22
CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH3

 General Laboratory preparation alkane
Alkane are generally prepared in the laboratory by heating the mixture of  Alkanoate (salt made from Alkanoic acid and sodium metal like sodiumthanoate, sodiumpropanoate, sodiumbutanoate. E.t.c.) salt with soda lime (CaHNaO2).

GENERAL PHYSICAL PROPERTIES OF ALKANE
1.      Methane and ethane are gas at room temperature, propane and butane are liquid at room temperature while others are solid
2.      They have no action on litmus paper
3.      They are slightly soluble in water. Solubility decreases as the the number of carbon atom increases.
GENERAL CHEMICAL PROPERTIES
1.      Combustion reaction: all alkane burns in air with a blue non-luminous flame to give carbon(iv)oxide and water. E.g. CH4 + 2O→ CO2 + 2H2O
2.      Substitution reaction: substitution reaction is a kind of chemical reaction whereby an atom or a group of atom is replace by another atom of group of atom. Alkanes can undergo substitution reaction with the halogens. And the reaction is also called halogenation. For example methane undergoes substitution reaction with chlorine to give choloro-methane in the presence of sunlight.
Chemical test for alkane
1.      All members of alkane has no effect on bromine water
2.      All members of alkane has no effect on acidified and alkalined potassium heptaoxodichromate(vi). (K2Cr2O7) and potassium tetraoxomanganates (vii).(KMnO4).

USES OF ALKANES
1.      They can be used as fuel
2.      Methane is used in the production of water gas
3.      They can be used in the production of hydrogen, alkynes, chloroform and so on.

4.      Tetrachloromethane is used as organic solvent in industries for manufacturing process.