Project on Barcode

Project on Barcode

Project on Barcode

What is Barcode ?

Barcode is machine readable representation of information related to product to which it is attached.

Types of Barcode ?

Barcodes are of two types i.e. 1D and 2D

1.       One dimensional (1D) Barcode : 

                                                            It is also
known as linear barcode. Originally it is prepared by changing width and
space of parallel lines

Ex.
Codabar, code 25, Code 11, Code 39, Code 93, Code 128, CPC Binary, DUN
14, EAN 2, EAN 5, EAN 8, EAN 13, Facing Identification Mark, GS1-128,
Intelligent Mail Barcode, ITF 14, JAN, KarTrak ACI, Latent image
barcode, MSI, Pharmacode, PLANET, Plessey, PostBar, POSTNET, Telepen
etc.

2.       Two dimensional (2D) Barcode : 

                                                            2D code is a
matrix code to represent information in two dimension. It
represent more information as compared to One dimensional (1D) Barcode.

Ex.
Aztec Code, Data Matrix, EZcode, High capacity color barcode, MaxiCode,
NexCode, PDF417, Qode, QR code, ShotCode, SPARQCode etc.

 

What is Symbologies ?

Mapping between barcode and messages is known as symbology.

1D Symbologies :

                            It is also known as linear symbologies  which is read by laser.

2D Symbologies :

                           It is known as 2D Symbologies is read by digital camera.

 

What is Scanner or Barcode reader ?

Scanner
or Barcode readers have the ability to decode barcodes to obtain
information from it. Like RS-232, Keyboard Interface Scanners, USB
Scanners and now days many mobile phone come with barcode scanner by
utilizing mobile camera and many apps support barcode scanning like
Google goggles,  mbarcode etc

 

Barcode Verifier Standards

For 1D or linear :

                              ISO/IEC 15416

For 2D :

                ISO/IEC 15426-2

 

What is Pharmacode ?

Pharmacode is also called as Pharmaceutical Binary Code. It is used in Pharma industry to control packing system.

Encoding of Pharmacode

Pharmacode
contain a single value from 3 to 131070. Pharmacode can be read from
left to right or right to left. Narrow bar in pharmacode shows 2ⁿ and wide bar show 2*2ⁿ where n is bar position starting from 0 at right position.

 

What is Data Matrix ?

It
is two dimensional matrix barcode that contain black & white
modules or cells  arranged in square or rectangular pattern. Data Matrix
store text as well as numeric data. Some error correction codes are
used in data matrix to increase its reliability. Data Matrix have the
ability to store upto 2335 alpha-numeric characters.

 

What is QR Code ?

It
is Quick Response Code. QR Code become more popular due to its fast
readability and more storage capacity as compared to the standard UPC (
Universal Product Code ) barcodes.

 

What is GTIN ?

It
is Global Trade Item Number developed by GS1 for trade items. GTIN
number may be encoded in EAN 8, EAN 13, UPC A, UPC E and other barcodes
in GS1 system.

UPC = Universal Product Code

EAN = now  International Article Number originally European Article Number

 

What is ITF Barcode ?

ITF
Barcode is Interleaved Two of Five ( Interleaved 2 of 5 ) barcode
system. ITF is continuous two width barcode symbology for encoding
digits.

12 Class Chapter 15- Polymers

Polymer & Polymerization

Condensation Polymer: Nylon-6-6, Terylene.

Addition Polymer: Polythene, Neoprene.

Polymer Classification

Polymer Classification on the basis of Source:

1.    Natural Polymer: Protein, Cellulose, Rubber.

2.    Semi-synthetic Polymer: Cellulose Derivatives as cellulose acetate (Rayon), Cellulose Nitrate.

3.    Synthetic Polymer: Plastic (Polyethene), Synthetic Fibers ( Nylon 6-6), Buna-S.

Polymer Classification on the basis of Structure:

1.    Linear Polymer: High Density Polythene, Polyvinyl Chloride.

2.    Branched Chain Polymer: Low Density Polythene.

3.     Cross Linked or Network Polymer: Bakelite, Melamine.

Polymer Classification on the basis of Molecular Forces:

1.    Elastomers: Weak intermolecular forces. eg.- Natural Rubber, Synthetic Rubber.

2.    Fibers: Strong intermolecular forces. eg.- Polyamides (Nylon6-6), Polyesters (Terylene).

3.    Thermoplastic: Polythene, Polystyrene.

4.    Thermosetting: Bakelite, Urea Formaldehyde Resins.

Lower Density Polyethene  (L.D.P.) : prepared at 1000-2000 atm pressure, 350-570 Kelvin Temperature and O₂ peroxide inhibitor.

Higher Density Polyethene  (H.D.P.) : prepared at 6-7 atm pressure, 333-343 Kelvin Temperature and Zieglar Natta Catalyst.

Polymers	Monomers	Monomer Formula	Use
1.    Teflon	Tetrafluroethene	CF2=CF2	Oil seals, Gasket
2.    Polyacrylonitrile	Acrylonitrile		Commercial Fibers
3.    Terylene or Decron	Ethylene Glycol Teryphthalic Acid	HOCH2-CH2OH	Commercial Fibers
4.    Nylon 6,6 And 5.    Nylon 6	Hexamethylene-diamine Adipic Acid Caprolactum	NH2(CH2)6NH2 HOOC(CH2)4COOH	Making Sheets, bristles of brushes, textile industry, tyre cords, fabrics, ropes etc.
6.    Phenol Formaldehyde Polymer
i.                   Novolac	Phenol + Formaldehyde	HCHO	Used in paints
ii.                 Bakelite	Phenol + Formaldehyde	HCHO	Comb, Electric switches
7.    Malamine Formaldehyde Polymer	Malamine + Formaldehyde	HCHO	Unbreakable crockery
8.    Buna S	1,3-Butadiene + Styrene	CH2=CH-CH=CH2	Auto tyres, cables insulation, floor tiles

Chemistry Notes Benzene

introduction

Benzene is an organic compound with molecular formula C₆H₆. Benzene molecule is made of six carbon atoms joined in a ring, with one H-atom attached to each C-atom. Because of its molecules contain only carbon and hydrogen atoms, benzene is also known as a hydrocarbon.

it is a natural constituent of crude oil, it is an aromatic hydrocarbon, having cyclic hydrocarbon with a continuous pi bond. It is abbreviated as Ph–H. Benzene is a colourless and a highly flammable liquid having a sweet smell. It is mostly used as a precursor to heavy chemicals, like ethylbenzene & cumene, which produced on a billion kilogram scale. Because of  having a high octane number, it is an important component of gasoline, containing a few percent of its mass. Most of its non-industrial applications have been limited because of benzene's carcinogenicity.

Bromobenzene is first turned into Grignard Reagents, then reacted with other chemicals...

12 Class Chapter 6- General principle and process of isolation of the elements

General Principle and Process of Isolation of Elements

Minerals: - 

               These are naturally occurring chemical substances in the in the earth crust obtainable by mining.

Ores   : - 

       only few minerals are used as sources of that metal. Such minerals are known as ores.

Gangue: -

            ores are usually contaminated with earthly or undersides materials known as gangue.

Metallurgy: - 

                 The entire scientific and technological process used for isolation of the metal from its ores is known as metallurgy.

Concentration of the ore: - 

                                   The removal of earthy and siliceous impurities (i.e. gangue or matrix) from the ores is called concentration of ores.

(i)                Hydraulic washing: -

                                                 The processes by which lighter earthy particles are free from the heavier ore particles by washing with water.

(ii)             Magnetic separation: - 

                                         This method of concentration is  employed  when  either the ore or impurities associated with it are magnetic in nature.

Example: - chromate.

(iii)           Froth floatation: - 

                                       This method is based upon the fact that surface of sulphide ores is preferentially wetted by oils while that of gangue is preferentially wetted by water.

(iv)           Leaching: - 

                               This process consists in treating the powdered ore with a suitable reagent which are selectively dissolved the ore but not the impurities.

1)     Leaching of Alumina from bauxite: - 

                                                                   ore of aluminum, bauxite usually contain  SiO₂, iron oxide, Tio₂, as impurities .the concentration is carried out by digesting the powdered ore with the concentrated solution of  NaOH  at 473 to 523 K and 35-36 bar pressure. This way Al₂O₃ is leached out as sodium aluminates behind.

·        3H₂O+Al₂O₃+2NaOH   ---->  2Na[Al(OH)₄]

The aluminates in solution is neutralized by passing Co₂ gas and hydrated  Al₂O₃ is precipitated.

·        2Na[Al(OH)₄]+CO₂  ---->  Al₂O₃*xH₂O + 2NaHCO₃ 

NaHCO₃ remains in the solution and hydrated alumina is filtered, dried and heated to give back pure Al₂O₃.

2)     Other Examples: -    

                                   In the metallurgy of silver and that of gold , the respective  metal is leached with a dilute solution of NaCN or KCN  in the presence of air (for O₂) from which the metal is obtained later by replacement.

Where M = Ag or Au.

4[M(CN)₂]^- + Zn  ---->  [Zn(CN)₄]^2- + 2M

Extraction of crude metal from concentrated Ore :-

The concentrated are must be converted into a form which is suitable for reduction. The process used to obtain metals in Free State from concentrated ores is called extraction. It involves two chemical processes-

1.      Conversion of the ore into metallic oxide or de-electronation of ores: - 

                                  Metal usually present as hydroxides, carbonates and sulphides depending upon the nature of the minerals present in the ore, the following two present in the ore, the following two methods are used for conversion of ore into their respective oxides.

(a)  Calcinations: - 

                          It is the process of converting on ore into is oxide by heating it strongly below its melting point either in absent or limited supply of air during calcinations following change occur

(i)                Moisture is driven out

(ii)             Volatile impurities of  S, As and P  are removed as their volatile oxides

(iii)           Water is remove from hydrated oxides and hydroxide ores

(iv)           Carbonate ore are converted into their respective oxides by lose of  carbon dioxide

(b)  Roasting: - 

                   It is the process of converting an ore into its metallic oxide by heating strongly at temperature insufficient to melt in excess of air. This process is usually used for sulphide ores. Following change occur during roasting.

(i)                Moisture  is removed

(ii)             Organic matter   is destroyed

(iii)           Non metallic impurities like that of S, P and Ar are oxidized and removed   as volatile gases.

S₈ + 8O₂  ---->  8SO₂­ (Sulphur dioxide)

P₄ + 5O₂  ---->  P₄O₁₀­ (Phosphorus pentaoxide)

4As + 3O₂   ---->  2As₂O₃­ (Arsenious oxide)

(iv)           Ores are generally converted into metallic oxides

2ZnS (Zinc sulphide) + 3O₂   ---->   2ZnO (Zinc oxide) + 2SO₂­

2PbS (Lead oxide) + 3O₂    ---->    2PbO (Lead oxide) + 2SO₂­

2Cu₂S (Cuprous sulphide) + 3O₂    ---->  2Cu₂O (Cuprous oxide) + 2SO₂­

Like calcinations, roasting is also carried out in a reverberatory furnace

Thermodynamic principles of metallurgy: - 

                                                                     For any process, Gibbs free energy change (∆G) is given by

                                    ∆G = ∆H - T∆S

When ∆H is the enthalpy change and ∆S is the entropy change and T is the absolute change for any reaction

∆G^ϴ = -RT ln K

Where, k is the equilibrium constant of the reactant – product system at the temperature T, A negative ∆G implies a +ve K in equation and this can happen only when reaction proceeds towards product.

Applications:-

(a)  Extraction of iron from its oxides - 

                                               Oxides ores of iron after concentration through calcinations/ roasting are mixed with limestone and coke and fed into a blast blast-furnace from its top. Here, the oxides is reduced to the metals

                                FeO + C    ---->   Fe + CO

And FeO is reduced and C is oxidized to CO.

FeO   ---->   Fe + 1/2O₂

C + 1/2O₂    ---->   CO

At 500-800 K

3Fe₂O₃ + CO   ---->   2Fe₂O₄ + CO₂

 Fe₃O₄ + 4CO  ---->   3Fe + 4CO₂

 Fe₂O₃ +CO   ---->  2FeO + CO₂

At 900-1500 K

 C + CO₂   ---->  2CO

 FeO +CO   ---->  Fe +CO₂

Limestone is also decompose to CaO which remove silicate impurities of the ore as a slag

                                  CaCO₃  ---->  CaO + CO₂

                                  CaO + SiO₂ ---->  CaSiO₃ (slag)

The iron obtained from blast furnace contains about 4% carbon and many impurities in smaller amount (e.g. S, P, Si, Mn) this is known as pig iron.

(b)  Extraction of copper from cuprous oxide: - 

                                                                           Most of the ores are sulphide and some may also contain iron . The sulphide ores are roasted/ melted to give oxides.

2Cu₂S + 3O₂  ---->    2Cu₂O + 2SO₂

The oxide then can be easily reduced to metallic copper using coke.

Cu₂O + C  ---->   2Cu + CO

And slag of iron silicate is produced

                        FeO + SiO₂ ---->  FeSiO₃ (slag)

Following reaction also takes place

                        2FeS + 3O₂ ---->  2FeO + 2SO₂

                        FeO + SiO₂ ---->  FeSiO₃

2Cu₂S + 3O₂  ----> 2Cu₂O + 2SO₂

2Cu₂O + 2Cu₂S  ----> 6Cu + SO₂

(c)  Extraction of zinc from zinc oxide: - 

                                                              The reduction of zinc oxide is done by using coke

            The metal is distilled off and collected by rapid chilling

(d)  Extraction of Aluminum: - 

                                               Alumina Al₂O₃ is mixed with Na₃AlF₆ or CaF₂ which lowers the melting point of the mixture and brings conductivity. Fused mixture is electrolyzed. Steel cathode and graphite anode is used. The graphite anode is useful for the reduction of metal, the overall reaction are as follow-

2Al₂O₃ + 3C ----> 4Al + 3CO₂

            The electrolytic reactions are –

                                    Cathode: Al³⁺ + 3e^- ---->   Al

                                    Anode: C + O^2-  ---->  CO + 2e^-

                                                    C + 2O^2- ---->  CO₂ + 4e^-

(e)  Extraction of  copper  low grad ores and  scraps  :- 

                                                                                         Copper  is extracted  by  hydro metallurgy from low  grade  ores it is leached out using acid or bacteria the sol containing Cu²⁺   is treated with scrape  iron or hydrogen.

Cu²⁺ + H₂ ---->   Cu + 2H⁺

Oxidation reduction: - 

                                 Besides reduction, some extraction are based on oxidation particularly for non-metals. For extraction of chlorine from brine.

2Cl^-  + 2H₂O ----> 2OH^- + H₂ + Cl₂

Refining: -   

                The process of purifying the crude metals is called refining. Some methods of refining are as follow.

a)     Distillation: - 

                              This is very useful for low boiling metals like zinc and mercury. The impure metals are evaporated to obtain the pure metals as distillate.

b)     Liquation: - 

                       In this method a low melting metal like tin can be made to flow on a sloping surface, in this way it is separated from higher melting impurities.

c)     Electrolytic refining: - 

                                          In this method the impure metal is made to act as anode a strip of some metal in pure form is used as cathode. They are put in a suitable electrolytic bath containing soluble salt of the some metals the more basic metal remains in the solution and the less basic ones go to the anode mud.

Anode:    M   ----> Mⁿ⁺ + ne^-

Cathode:   Mⁿ⁺ + ne^-   ----> M

d)     Zone refining: - 

                               In this method a circular mobile heater is fixed at one end of a rod or the impure metal, as heater more forward, the pure metal crystallises out of the melt and impurities pass on into the adjacent molten zone.

e)     Vapour phase refining  :- 

                                            The crude metals is free from  impurities by first converting it into a suitable volatile compound by heating it with specific reagent at a lower temperature and then decomposing the volatile compound at some higher temperature   to give the pure metal.
Ex: - (1) Mond Process and (2)  van arkel method

f)      Chromatographic method: - 

                                               The method is based upon the principle that the different components of a mixture are adsorbed to different extents of an adsorbent.

For example in column chromatography, different components of the mixture are adsorbed to different extents depending upon their polarity.