Wednesday, April 29, 2015

Saponification

               Animal fats and vegetable oils are esters of carboxylic acids. These fats and oils are called triglycerides. Triglycerides reacted with sodium or potassium hydroxide to produce fatty acid salt and glycerol. The salt of fatty acid is called soap.
*Saponification process is a hydrolysis reaction.
*Soap is produced by saponification of a triglyceride.
*Soap is a salt composed of a mixture of carboxylate anion and univalent cations.
*Sodium hydroxide produce hard soap.
*Potassium hydroxide produce soft soap.
*Potassium soaps are more soluble than sodium soaps and readily produce lather.

How Soap Clean ?
       The hydrophilic (carboxylate) end of the soap molecules attached to water. The hydrophobic (hydrocarbon chain ) end attached to oil and grease. The more and more soap molecules embedded
into a grease to forming micelles around oil droplets. The hydrophobic ends of the soap molecules attached towards the grease while the hydrophilic ends of the soap face outward into the water, resulting is an emulsion of soapy grease particles suspended in the water. Then the oily particles are easily washed away. The water agitation can help to clean greasy and oil. The micelles are dispersed into the water.
                                          Hydrophilic -  ( water loving )
                                         Hydrophobic- ( water hating )
              Soap do not work well in hard water. Hard water containing calcium and magnesium ions. these ions react with soap to form an insoluble precipitate known as soap film. This precipitate is often seen as a gray line on a bathtub or sink and is often called scum.

Detergents:
       Detergents are similar to soaps. They work in both soft and hard water. The detergent removes the oil film and the dirt can be washed away.

Tuesday, April 28, 2015

Solidification

          Substance changes from a liquid phase to solid phase when its temperature is lowered below its freezing point. it is also known as freezing.

Saponification

              Triglycerides reacted with sodium or potassium hydroxide to produce fatty acid salt and glycerol.

Rusting of Iron

         Iron combine with oxygen in the presence of water molecule to form a iron oxides. (rust).

Combustion

                 Energetic molecules (hydrocarbons) combine with oxygen to produce carbon-dioxide and water.

Aerobic Respiration

             Respiration helps to breaks down glucose into carbon-dioxide and water.

Photosynthesis

               In the presence of sunlight carbon-dioxide and water molecule reacts to form a glucose (food) and oxygen.

Izomerization

               In this process compounds are transformed into any of its isomeric forms. ( same atom but different molecular rearrangements).

Acid-Base Reaction

Lewis Definition:
   Acids are electron pair acceptors. ( lewis acid ).
   Bases are electron pair donors. ( lewia base ).

Double Displacement Reaction

                 In double displacement reaction one of the part of reactant is replaced by another part of reactant. The two reactant replaces to forming two new compounds or product. It is also known as Metathesis reaction.

Single Displacement Reaction

                   One element replaced from a compound by another element. It is also known as substitution or single replacement reaction.

Decomposition Reaction

                In decomposition reaction a compound is broken into elements or simpler compounds. It is also known as Analysis.

Synthesis Reaction

              A chemical reaction of two or more substances react to give a single product. It is also known as combination.

Rusting Of Ion

               Irons form a red-brown stuff that is called rust. Rusting of iron is a chemical process. In this case iron combine with oxygen in the presence of water molecules to form a iron oxide.
Fe   +   O2   +   H2O      Fe2O3.XH2O

Combustion

             Energetic molecules combine with oxygen to produce carbon-dioxide and water. Combustion reaction is a exothermic reaction. So it release heat.
Example:
C3H8   +   5O2      4H2O   +   3CO2   +   Energy ( Heat )
            Burning, light a grill, strike a match sticks combustion of propane gas these are the combustion reactions.

Aerobic Respiration

                 Respiration helps to breaks down glucose into carbon-dioxide and water. Energy used by cells is chemical energy in the form of ATP ( adenosine triphosphate ). Aerobic respiration is the opposite process of photosynthesis.
C6H12O6+   6O2      6CO2   +   6H2O   +   Energy ( 36 ATPs )

Photosynthesis

              Photosynthesis is a chemical reaction by which green plants make their own food. In the presence of sun light carbon-dioxide and water molecule react to form a glucose ( Food ) and oxygen. This is the most common everyday chemical reaction.
6CO2   +   6H2O   +   light      C6H12O6   +   6O2

Formation Of Covalent Bond

                    Covalent bond occurs between the non-metal. Two atoms share their valence electrons. The two atoms sharing the outer most ( valence ) electron each other.

Formation Of Ionic Bond

                   Usually metals have low ionization energy, so that metals (Na) release some of their electrons to attain a stable configuration. Now the atoms becomes cations. Some of the non-metals (Cl) electron affinity is positive, so that non-metals accept the electron to attain a stable configuration. Anions are formed.

Example :
Na   +   Cl      Na+   +   Cl-

Na+   +   Cl-      NaCl
     A piece of sodium metal atom react with chlorine gas a vigorous reaction takes place, it will give sodium chloride a common table salt.

Key Point :
         Electron transfer from metal to non-metal atom.
                       Sodium atom transfer an electron to the chlorine atom the ions attract each other to form Na+ and Cl- ions. The lose of electrons from the sodium atom into a positively charged Na+ ions. ( cations ). The gain of electrons from the chlorine atom into a negatively charged Cl- ions. (Anions ). The cations and anions combine to form NaCl.

Monday, April 20, 2015

Isomerization

             Isomerization is a chemical process. In this process compounds is transformed into any of its isomeric forms. ( same atom but different molecular rearrangements.

Examples :
             Pentane, hydrocarbon with five carbon atoms joined in a straight chain to its branched chain isomer 2-methylbutane and 2,2-dimethylpropane.

             In gasoline manufacturing, straight chain hydrocarbons are converted into branched chain hydrocarbons in the presence of a catalyst.

Hydrolysis Reaction

                    Hydrolysis is a chemical reaction that involves a salt reacting with water to produce hydrogen ions and hydroxide ions. It is a type of decomposition reaction one reactant is water. Hydrolysis means " water separation ".
Example:
CH3COOH    +   H2O   →   H3O+   +   CH3COO-
NH3   +   H2O     →    NH4+   +    OH-
H2SO +   H2O    →   H3O+   +   HSO4-

HCN   +   H2O   →   H3O+   +   CN-

Friday, April 3, 2015

Combustion Reaction

     Combustion reaction is a chemical reaction. In this reaction hydrocarbons react with oxygen to give carbon-dioxide and water. It is a exothermic reaction so it release heat.

Types :
*Complete combustion reaction
*Incomplete combustion reaction.

Complete reaction :
     In this of reaction hydrocarbons react with oxygen to gives carbon-dioxide and water. Here the oxygen fully react with reactants to gives product.

Incomplete reaction :
     In this types not enough oxygen in reactants. so it will react to give carbon, carbon-monoxide and carbon-dioxide.

Examples :
( C, H and O )   +   O2      CO2   +   H2O   +   Heat
CH4   +   2O2      CO2   +   2H2O   +   Heat
C10H8   +   12O2      10CO2   +   4H2O   +   Heat
C3H8   +   5O2      3CO2   +   4H2O   +   Heat

2CH3OH   +   3O2      2CO2   +   4H20   +   Heat

Redox Reaction ( Oxidation - Reduction reaction )

            Redox reaction is a chemical reaction, that involves electron transfer between two chemical species.
* loss of an electron is oxidized
*gain of an electron is reduced.
It is also known as oxidation - reduction reaction.

Example:

Redox reaction :
 H2   +   F2      2HF
overall reaction may be written as two half - reaction.

Oxidation reaction :
H2      2H+   +   2e-

Reduction reaction :
F2   +   2e-      2F-
Now we adding the reactions together the electrons are canceled.
                 H2      2H+   +   2e-
F2   +   2e-      2F-
----------------------------------------
H2   +  F2       2H+   +   2F-
2H+   +   2F-  combine to give 2HF.

Acid-Base Reaction

Lewis Definition :
       Acid - base reaction is a chemical reaction. In this reaction acids are electron pair acceptors (lewis acid ). Bases are electron pair donars ( Lewis base ).

General Formula :
A+   +   B     A-B
Example :
BF3   +   F-      BF4-
HCl   +   OH-     H2O  +  Cl-
H+    +   OH-    H2O
H+    +  NH3     NH4+

COCl+  +  Cl-     COCl2

Thursday, April 2, 2015

Double displacement Reaction ( Metathesis )

                        In double displacement reaction one of the part of reactant is replaced by another part of reactant. The two reactant replaces to forming two new compounds or product. It is also known as double displacement reaction or metathesis reaction.

General Formula :
AB  +  CD     ---->   AD  +  CB  

Example :

AgNO3   +   NaCl       AgCl   +   NaNO3
AgNO3   +   HCl        AgCl    +   HNO3
NaOH    +    HCl       NaCl    +   H2O
Li2SO4   +  BaCl2     2LiCl    +   BaSO4

Na2SO32HNO3    2NaNO3   +   H2SO2

Wednesday, April 1, 2015

Single Displacement Reaction ( Substitution Reaction )

                       In single displacement reaction one element replaced from a compound by another element. It is also known as substitution reaction or single replacement reaction.

Types  :
* cation replacement . ( positively charged ions mostly metals )
* anion replacement . ( negatively charged ions  mostly non-metals )

General Formula :
A     +      BC        ---->       AB     +       C
A     +      BC        ---->       AC     +       B

Examples:

Cl2  +  2NaBr       2NaCl   +   Br2
Cu   +   2AgNO3  Cu(NO3)   +   2Ag
Zn    +  2HCl      ZnCl2   +  H2
Fe    +  CuSO4     FeSO4     +   Cu
Zn    +  CuCl2      ZnCl2  +  Cu
Cl2   +   2KBr      2KCl   +  Br2

Br2   +   2KI        2KBr   +   I2