Chemistry Essays - Chemistry Report on Explosives

Chemistry Report on Explosives

What is meant byoxidation and demo how oxidation reactions are used to do detonations.

Oxidation is the term used for the combinationof a substance with O, or in general any reaction where an atom ormolecule loses negatrons.

This can be shown as:

C( s )+ O2( g )Carbon monoxide( g )

S=solid, g=gas

Gunpowderor black pulverization is the oldest explosive we know. It is made up of a mixture ofpotassium nitrate ( besides known as potassium nitrate or KNO3) , wood coal, andsulfur in different proportions. When gunpowder is manufactured today, it ismade with the ratios 7.5:1.5:1 by mass ( 2 ) .

Bothgunpowder and dynamite have within them substances which are readily availableto oxidization. The O which is used for the oxidization is an intrinsic partof the mixture, and is held within them in the same mode that O isstored in the chemical K chlorate.

Whengunpowder is ignited, this oxidization is highly rapid, and a big volume ofgas is produced. The gasses are under utmost force per unit area, which causesthem to spread out quickly. Heat is produced doing the gas atoms toaccelerate, making even more force per unit area. If the gas expands faster than thespeed of sound, this creates a shockwave. The force per unit area produced by the gassesis what causes parts of the bomb ( shrapnel ) to be propelled far and broad atvery high velocities ( 1 ) .

Thespeed at which something oxidises is dependent on its possible to interactwith O. The greater figure of unstable negatrons that a molecule or atomhas to lose, the quicker it will be oxidised ( 3 ) .

B ) Give an history of thedevelopment of chemical compounds for usage in explosives. Describe theadvantages of each new chemical explosive over its predecessors, and describehow the explosives were adapted to do them safer and more effectual. ( 9marks )

It is thought that the firstexplosive discovered was ‘black pulverization ‘ , arising in tenth Century China. Itwas used for ceremonial pyrotechnics. In Europe, 1242 saw the expression for blackpowder being published by Roger Bacon. The polish of the substance closelyfollowed after the gun was invented by Berthold Schwartz in 1300. Around thistime, black pulverization was being used for remotion of stones, the teqnique was knownas fire scene, but this was replaced with blasting at the beginning of the17th Century. There are records of blaring in America from 1773 ( 4 ) .

The production of black powderwas quickly increased during the American Revolution. By the bend of thecentury, the commercial production of the explosive had grown from 25 millionto 100 million ( 2 ) .

In 1846, Nitroglycerin wasdiscovered by Ascanio Sobrero. Nitroglycerin plasticizes collodion which is aform of nitrocellulose to organize blaring gelatin. This is a really powerfulexplosive. The find of this action led to the promotion of smokeless powder, thefirst double-base propellent and a precursor of cordite.

Alfred Nobel built a mill toproduce it in 1861 in Sweden. An advantage of glyceryl trinitrate was its massiveexplosive power, but it was really hard to transport as it is a liquid, which used black pulverization to light it. It could besides stop dead and had toxic fumeswhich caused terrible concerns ( 5 ) .

In 1867, Nobel accidentallyinvented Dynamite and he went on to patent his mixture. It was a greatdiscovery, being more powerful than black pulverization, with a higher detonationvelocity which made it much more effectual breakage stone as it non merely moved, but broke apart the stone

Ammonium nitrate was ab initio synthesizedin 1659 by J. R. Glauber by intermixing ammonium carbonate and azotic acid. It wasmostly used for fertiliser and blasting and to replace a part ofnitroglycerin in dynamite ( 1 ) .

Dupont introduced Nitramon in1935. This was seen as a discovery. They had safe handling, were inexpensiveand did non do wellness jobs.

It was known as ANFO ( AmmoniumNitrate & A ; Fuel Oil ) when it was developed in 1955. During its production itcaused a big Texas City detonation. It was easy to lade and transport andcheaper than dynamite, it is non a Class A explosive until assorted, but itsaction could be decreased by H2O. Over 2.2 billion lbs of it were producedin 1974.

Water gels were developed from researchto solve the H2O job with ammonium nitrate merchandises ( early 1940s ) . Themarket was little though as most applications needed a little merchandise and therewas no economical sensitiser was non available.

degree Celsius ) Discuss, with mention to highand low explosives, the ideal characteristics of an explosive reaction, explicating, with illustrations, how chemical reactions produce energy and how they causeincrease in force per unit area. ( 6 Markss )

There are three classs of explosives: high explosives, primary explosives and low explosives. Gunpowder is a low explosive so thereaction occurs easy. Expanding gasses are used to impel, non destruct, suchas slug propulsion from a gun ( 3 ) .

In high explosives, devastation is caused by the expandinggasses, and the utmost force per unit area causes a shockwave, if the gas expands morequickly than the velocity of sound. The shockwave contributes to the demolitionpower of TNT ( TNT ) .

Primary explosives are intended to detonate non fire. Theyare used for fuses and blaring caps to originate an detonation. Shockwaves are acrucial factor in detonations. It is a moving ridge formed from a zone of tremendously highpressure in a fluid, including the ambiance that travels faster than the speedof sound. It moves from the point of the detonation transporting energy and has a severedamaging consequence on solid objects it bounces away ( 5 ) .

In the chemical reaction of the detonation, compounds are brokendown to organize assorted gases. The original chemical compounds ( reactants ) have muchenergy stored up as chemical bonds between atoms.When molecules break apart, the merchandises ( gases ) may utilize some of this energy toform new bonds. Most “ remnant ” energy takes the signifier of extremeheat.

vitamin D ) Describehow UK methods of industry of acetone have changed since the get downing ofthe First World War. ( 3 Markss )

Propanone isalso known as Acetone, 2-propanone, methyl ketone and dimethyl ketone. It hasthe chemical expression:

( CH3)2C=O.

Prior to theFirst World War, it was manufactured by hydration of propylene from crackedgases. This was revolutionized during WW1 when the chemist Chaim Weizmann showed that acetone could beproduced by the bacteriaClostridium acetobutylicum,this was acontinuation of the surveies originally performed by Louis Pasteur showingfermentation was promoted by bugs in the 19Thursdaycentury ( 2 ) .

vitamin E ) Discuss how attitudes to wellness and safety in chemicalresearch and industrial chemical science have changed over clip. Use illustrations from thehistory of the development and industry of explosives and medical specialties. ( 4marks )

In modern times, we have a numberof wellness and safety statute laws which govern the fabrication and usage ofexplosives for their assorted intents. One illustration is the 1996 USA Departmentof Commerce directive on the fabrication of pyrotechnics and explosives ( 6 ) .There are now really tight ordinances guaranting that everyone working in thesector is protected every bit far as possible. It is besides accepted that the companiesinvolved have duty to protect their workers from injury and mustprovide safety equipment ( 3 ) .

Historically there have been immense Numberss of accidentsduring explosive production. At one gunpowder factory in the early 19Thursdaycentury, situated in Roslin, Scotland, detonations killed two work forces shortly afterthe factory opened in 1805 and three more were killed by 1815. Many more followed.Deaths caused during the fabrication procedure would hold numbered greatly asthis was merely from one of the 1000s of Millss worldwide during a shortperiod.

Old attitudes focused on worker duty, were nowresponsibility should be shouldered by the company besides.

Decision

Explosions are due to combustionwhich involves the usage of the oxidization procedure. Depending on how available thesubstance is to interact with O will depend on how rapidly it is oxidised.The more rapidly it is oxidised, the more rapidly the gases will spread out and themore lay waste toing the detonation will be.

Mentions

Chang, Raymond,General Chemistry: The Essential Concepts4th Edition 2004

Kotz, John C. , Paul M. Treichel, and Gabriela WeaverChemistry and Chemical Reactivity6th Edition 2003

Spencer, James N. , George M. Bodner and Lyman H. RickardChemistry: Structure and Dynamicss3rd Edition 1999

Infelta, PierreIntroductory Thermodynamicss1st Edition 2005

Smith, E. BrianBasic Chemical Thermodynamicss5thEdition 2004

USA Department Commerce, 009, Manufacture of Fireworks June 2002

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