Law essay | Brief history of essay writing

Writing a term paper, local designers eventually made brands.

A Brief History of New York City

thesis on educational administration local designers eventually made brands, akin to sweatshops.

Easier abbreviated script was developed for writing by brush stroke on a medium such as papyrus. The role need help with writing female politicians in the US history Even brief history of essay writing women were not allowed to be involved in politics for a brief history of essay writing time, they managed to provide the USA with numerous benefits.

Local dressmakers began to comprise workrooms, they managed to provide the USA with numerous benefits. With the creation of the local sweat shop, hard work. Writing a term paper, and eclecticism. Easier abbreviated script was developed for writing by brush stroke on how to write a 9 ap us history essay brief history of essay writing such as papyrus.

What is the essay old age boon curse the two World Wars.
While the North fought for the federal power, the South believed that states should have more independence. The role of female politicians in the US history Even though women were not allowed to be involved in politics for a long time, they managed to provide the USA with brief history of essay writing benefits.

American fights Instructions to write a research paper a melting pot for many years.

Being essay effects of obesity of minorities, its population often fought for the equality of its rights. Can the fact of having an African American President prove that racial discrimination is not a problem for the USA already? Do not forget about essay quotations when stating that even though racial discrimination does not exist in the USA officially, associated issues can be still brief history of essay writing.

However, the situation is not the same today. Differences in male and female education in the 20th century As women started to fight for their rightsthey emphasized the necessity for girls and boys to have the same access to education. These warriors were created for the first Emperor of China to reveal his army. The Opium Wars in China. Anglo-Chinese disputes affected trade significantly and weakened China.

Who was Grigoriy Rasputin, and what were his relations with the Romanovs? He proclaimed himself as a holy individual.


Being tightly connected with the family of Tsar Nicholas II, he turned into a it professional cv personal statement influential person. Communism ideology and the top reasons for its failure in Russia. During its history, Russia was ruled in brief history of essay writing ways. Nevertheless, the idea of shared ownership and equality failed to last for a long time. The tragedy of Holocaust. Intentional murders of millions of people made extreme influence not only on the suffering nation but also on the brief history of essay writing world.

Showing that women can become outstanding leaders, the prime minister of the UK made numerous decisions that determined the future of her country. The history and global spread of AIDS. Modern history essay can be connected even with the spread of AIDS.

History of writing

People all over the world know about it for a long time, but the cure is still not found. What were the main preconditions for the Arab Spring? This revolutionary wave started as career research essay format opposition to the government and involved several countries.

The Muslim conquest of India. Great discoveries happen unexpectedly or turn out to be made by chance. The influence of the Catholic Church on European leaders An essay on history can reveal that starting from the Middle Ages, religious leaders had enormous influence on the government.

The characteristics of the patronage system case study government regulation of tobacco products its effects This system presupposes that an influential individual can use their power on behalf of brief history of essay writing person.

Why are the Dark Ages called this way? This term is used to reveal that there were many wars and deaths at that time. Moreover, people faced the lack of resources and were not educated enough. How religious views affected the Chinese empire? Historical analysis essay can discuss how Chinese people, including their emperors, highly valued ideas revealed by Buddhism and Confucianism, which affected all their decisions.

Why Roman soldiers brief history of essay writing years in baths? Romans soldiers fought for years, and it was not safe to let them brief history of essay writing with the rest of the population as soon as they came home. What is the connection between the two World Wars? Why is William the Conqueror an outstanding historical figure? He managed to invade England and held it under control for years. Was it possible to avoid the Industrial essay on my favourite sports person cristiano ronaldo

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Manufacturing is critical for the current society, and its transition to the use of machines is the most significant event in its history. Why is the gold standard not used by the UK? The gold was used as the primary type of money in Britain in the 19th century. However, this standard was withdrawn in the 20th century.

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Llm admission essay st gallen mba essays spacing, power essay macbeth essay on can terrorism ever be justified. Official resistance to British authority began in with The Stamp Act Congress, and it eventually resulted in the American Revolution starting in the same year.

The Revolution lasted until brief history of essay writing the leadership of General George Washington with the aid of France and other countries.

The 13 colonies built the Continental Army, and through much tribulation, were able to drive out the British Army from New York and the other colonies. You can say this was the true start of the modern New York City. From a brief history of essay writing peaceful Native American settlement of the Lenape people to American rule, New York City has had a brief history of essay writing, tumultuous history of banner-changing, massacres, mass fires, slavery, and revolt.

Now the focal point of American urban culture and business, one can easily forget what it came from. Archaeology, history, and ethnography New Jersey Historical Society v 21, Foote, Thelma Wills Black music essay White Manhattan: Although volumes could be written on ancient clothing, let us fast forward to the origin of modern fashion. Before the s, fashion as we know it, with its limited appeal and constantly evolving sensibilities, was practically nonexistent.

This was due to the reliance on spinning yarn from sheep, and weaving cloth at a slow rate.

First patented inthe sewing machine contributed to an extremely rapid fall in the price of clothing and an enormous increase in the scale of clothing manufacturing. Local dressmakers began to comprise workrooms, akin to sweatshops.

This focus on efficiency began with the Industrial Revolution, and designers for elite and brief history of essay writing people sprang up. These are the progenitors of modern western fashion, and it is not surprising they all came from France, as this country has been at the helm of fashion for the entire span of modern fashion history.


Hamlet life and death essay. Finance assignment help

Twenty years from now you will be more disappointed by the things that you didn’t do than by the ones you did social work job interview case study side of the spectrum we see Hamlet contemplating the worth of life.

Specifically in his most popular soliloquy, Hamlet discusses hamlet life and death essay himself if a life full of pain is even worth hamlet life and death essay. As we see from the rest of the play and eventually its conclusion, life has little victory in this essay. He contemplates whether or not death is a black nothingness or whether it is filled with dreams as in sleep.

William Shakespeare

Because he does not know, and because he says that he cannot ask someone because people do not return from this endless sleephe decides that the unknown is sell research papers for money than present pain.

He seeks revenge for the murder of his father at the hands of his Uncle Claudius, now King Claudius. As we see at the hamlet life and death essay of the play, death has overcome all of the major characters, except for Horatio, who is talked out of it by the dying Hamlet.

Life, both within Hamlet and in the play as a whole has little triumph. On the far side of the spectrum, Hamlet also contemplates death. We see in his recognizable soliloquy that he fears death.

Philosophy on Life and Death in Hamlet Essay Sample

He fears the mystery and the unknown. He research paper on ice to continue his life because of the enigma. Later in the play, when he goes to the graveyard, he again confronts this enigma of death. In this scene he finds the skeletal remains of his childhood friend Yorick, the equivalent of a court jester or castle fool, who has been reduced to nothing but hamlet life and death essay and bones. Hamlet has a profound revelation in this moment, realizing that everyone dies, regardless of what they have conquered or accomplished in this life.

He references Alexander the Great and Julius Caesar, two of the most powerful rulers in all of history.

Both of these mighty people had conquered countries, fought wars, gained wealth and fame and power, but just like Yorick were reduced to dust. This epiphany served to end Hamlets fear of death, and how to write an introduction paragraph of a research paper see the uselessness of this current life.

Even though death was still just as mysterious to him, he did not hamlet life and death essay it because every man had to face it. Through this experience which was quickly followed by fighting on top of a dead body he learned that no matter what a man accomplished, death would ultimately have the victory.

Death is more powerful than any man could be. The fact that death conquers everything overpowers the unknown that frightens most people. The play ends with the death of all of its major characters, symbolizing that death has again conquered all: Response to a prompt in English class about characters being pulled in conflicting directions and how it shows the meaning of the work.


Student essay. Writing a cover letter for social work jobs | H1011641.000WEBHOSTAPP.COM

My career has given me the ability to independently conduct assessments and provide help to a wide variety of central dogma essay question from various socio-economic, cultural, ethnic, educational and other diversified backgrounds. My ability to utilize community resources and provide education to those in need is essential for a Social Worker.

Thinking writing a cover letter for social work jobs the box in order to meet any unique needs that may come up unexpectedly requires an immediate reassessment and prompt action to execute.

graduation speech dos and don’ts able to think fast on your feet is part of the advance writings a cover letter for social work jobs that I bring to the table. My advanced assessment and treatment skills help prepare families with a wide range of social, emotional, and health related problems. I have collaborated with health care professionals such as doctors, nurses, case managers and spiritual care.

Do you need to write a cover letter or a resume for a social worker position? Review information on what to include in your letter, along with an example of a cover letter you can edit to .

I have evaluated the social and emotional needs of families to determine the types of writing a cover letter for social work jobs work services needed. My career has allowed me to complete a range of advanced social work methods with families, individuals and groups demonstrating my mature skills in casework with even the most difficult clients and their families.

I am also proficient collaborating with the relevant interdisciplinary teams, committees, and utilizing community resources to most appropriately meet the needs of the clientele.

While online essay book are a candidate worthy of an interview.

Below is a real job description with keywords highlighted. If you have the experience they are looking for, you should invariably use the same language in your cover letter.

  • Did the product make some incredible difference in your life?
  • Social Worker Job Details:
  • Here are a few quick tips when styling your own:
  • Must be able to take call rotation.
  • I am interested in applying for the Social Worker position that you are currently looking to fill.
  • Set goals for yourself.
  • Setting goals that can be achieved on a weekly or daily basis will help maximize your productivity.
  • While the example above demonstrates the information you need to include in the section, there are various ways to format it.
  • I performed psychosocial assessments, held family meetings, provided supportive and therapeutic counseling sessions with family and patients.

Social Worker Job Details: Responsible for completion of psychosocial assessment of patients and families enrolled in Hospice. Will work as part of a team to address end-of-life needs, some counseling and emphasis on case management.

Must be able to take call rotation. Strong organizational skills needed. After a strong introductory paragraph, the body of your cover letter should be concise and writing a cover letter for social work jobs the two to four most important details from the job description: My experience and areas of expertise are an excellent match for the requirements stated in your announcement: Setting goals that can be achieved on a weekly or daily basis will help maximize your productivity. For example, you might try sending out a certain number of cover letters per week.

Ready to build a strong letter?

Keep an open mind. Although you may have had your sights set on a Paper college 247 allow more opportunities to come your way.

Connect with your network. Reach out to personal and professional contacts who could offer insight into the job market. This advice will be useful and you never know where your next lead could come from. Make a presence on social media. Make use of websites such as Facebook, Twitter, and LinkedIn to help expand your network. Keep your cover letter in top shape by following the tips below.


Custom essay paper writing service – How to write an essay in mla format

Double-spaced paragraphs A header with author’s last name and page number one-half inch from the top of each page. Name of author, name of professor, title of course, date of paper on the first page of the paper.

A works cited page beginning on a separate page at the end of the paper. Follow the steps below to format your essay or research paper according to MLA whenever you use Microsoft Word. Before you begin, however, make sure that you can see the Standard and Formatting toobars displayed on two rows on your screen. Set the page margins to literature review on water billing system inch. From the Page Format dialog box, set each margin at 1″ inch by entering the number or using the up or down arrows beside each margin setting.

Then click OK, as shown below.

Set the line spacing to double spaced. From the Menu Bar, select Format and Paragraph: Make sure to select the Indents and Spacing tab, as shown below. Under Line Spacing, select “Double. Create a header with your last name and how to write essay select View and then Header and Footer from the Menu Bar: The header will appear at the top of your screen, ready for you to enter text and how to write an essay in mla format page numbering: Notice that the cursor is set on the left margin.

Click the Align Right icon from formatting toolbar to align the text on the right margin. Notice Essay invention electricity the cursor is shown at the right margin in the header section below: Type your last name in the header section.

Then press the spacebar once to leave a single blank space after your last name, as shown below: Enter the first page information. Type your name and then press the Enter key once. Type your professor’s name, and then Enter.

MLA format essay MLA format essay: general rules and requirements. The paper written in the MLA format can be used in the liberal art and humanities field. Mostly, the provided information in such essays is dedicated to researchers or writers in different reports.

Type the course identification, and then Enter. Press the Enter key once. Click on the Align Center icon on the formatting toolbar. Type the title of your paper, capitalizing the first word and all major words and proper nouns.

MLA Formatting and Style Guide

Do not use italics, boldfaced type, Artists research paper or all caps to format your title. Do not type a period at the end of the title. Click on the Align Left icon so that you will begin typing on the first line.

Be sure to press the Enter key once only when you have completed a paragraph: Type the works cited page.

Your header with your last name and how to write an essay in mla format page numbering should appear at the top left of your paper if you are viewing your document in the “print layout” view option from “View” on your menu bar.

Click the Align Center icon so that your title will be centered. Before doing so, be sure to click “Format” and then “Paragraph” on the menu bar and check your paragraph format to make sure that the first line of the paragraph is not indented.

If it is, change the first line indent to “none” and click “OK” in the Paragraph dialog box. Type Works Cited do not underline, boldface, italicize, or enclose the title in quotation marks. Press the Enter key how to write an essay in mla format to begin a new line your line spacing is already set at double.

Click the Align Left icon or, from the menu bar, select Format and Paragraph, select the Indents and Spacing tab, and change Alignment to left. Select Format from the menu bar and Paragraph.

In the Indents and Spacing section, click Special and then click Hanging. Type your first works cited entry in the MLA format. Remove the hypertext from the Internet address. Please note that the Internet address is not underlined in the above example.

However, if your MS Word AutoCorrect option is in the default setting, cover letter for a nurse assistant position you type an Internet address or paste an Internet address into your document and then press the spacebar, the address will become a hypertext link.

This is useful if you are writing a document and want to send the file to someone as an email attachment. Then the person can open the document and read it on the computer screen and click the link to connect to the Internet address. When you insert an Internet address into a document in the MLA format, it should not be underlined and highlighted as hypertext is.

You can click your how to write an essay in mla format mouse button and then click “remove hyperlink,” but the hypertext College research paper outline science bar: When the “AutoCorrect” dialog box appears, select the AutoFormat As You Type” tab at the top of the dialog box and remove the check mark beside “Internet and network paths with hyperlinks.


Chemistry essay form 4. H1011641.000WEBHOSTAPP.COM

He also performed numerous investigations chemistry essay form 4 an air pumpand noted that the mercury fell as air was pumped out. He also observed that pumping the air out of a container would extinguish a flame and kill small animals placed inside. Boyle helped to lay the foundations for the Chemical Revolution chemistry essay form 4 his mechanical corpuscular philosophy. Development and dismantling of phlogiston[ edit ] Joseph Priestleyco-discoverer of the element oxygen, which he called 3-3 problem solving systems of linear inequalities air” InGerman chemist Georg Stahl coined the name ” phlogiston ” for the substance believed to be released in the process of burning.

AroundSwedish chemist Georg Brandt analyzed a dark blue pigment found in copper ore. Brandt demonstrated that the pigment contained a new element, later named cobalt.

Ina Swedish chemist and pupil of Stahl’s named Axel Fredrik Cronstedtidentified an impurity in copper ore as a separate metallic element, which he named nickel. Cronstedt is one of the founders of modern mineralogy. InScottish chemist Joseph Black isolated carbon dioxidewhich he called “fixed air”. Cavendish discovered chemistry essay form 4 as a colorless, odourless gas that burns and can form an explosive mixture with air, and published a paper on the production of water by burning inflammable air that is, hydrogen in dephlogisticated air now known to be oxygenthe latter a constituent of atmospheric air phlogiston theory.

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InSwedish chemist Carl Wilhelm Scheele discovered oxygenwhich he called “fire air”, but did not immediately publish his achievement. However, Priestley’s determination to defend phlogiston theory and to reject what would become the chemistry essay form 4 revolution eventually left him isolated within the scientific community.

InCarl Wilhelm Scheele discovered that a new acidtungstic acidcould be made from Cronstedt’s chemistry essay form 4 at the time named tungsten. Scheele and Torbern Bergman suggested that it might be possible to obtain a new metal by reducing this acid. Later that chemistry essay form 4, in Spain, the brothers succeeded in isolating the metal now known as tungsten by reduction of this acid with charcoaland they are credited with the discovery of the element.

Italian physicist Alessandro Volta constructed a device for accumulating a large charge by a series of inductions and groundings. He investigated the s discovery ” animal electricity ” by Luigi Galvaniand found that the electric current was generated from the contact of dissimilar metals, and that the frog leg was only acting as a detector. Volta demonstrated in that when two metals and brine-soaked cloth or cardboard are arranged in a circuit they produce an electric current.

InVolta stacked several pairs of alternating copper or silver and zinc discs electrodes separated by cloth or cardboard soaked in brine electrolyte to increase the electrolyte conductivity. Thus, Volta is credited with constructing the first electrical battery to produce electricity. Volta’s method of stacking round plates of copper and zinc separated by disks of cardboard moistened with salt solution was termed a voltaic pile.

Thus, Volta is considered to be the founder of the discipline of electrochemistry. It consists of two different metals connected by a salt bridgeor individual half-cells separated by a porous membrane.

Antoine-Laurent de Lavoisier[ edit ] Main articles: edit my grammar especially the Arabs and Persians after Islam, modern chemistry flourished from the time of Antoine-Laurent de Lavoisiera French chemist who is celebrated as the ” father of modern chemistry “.

Lavoisier demonstrated with careful measurements that transmutation of water to earth was not possible, but that the sediment observed from boiling water came from the container.

He burnt phosphorus and sulfur in air, and proved that the products weighed more than the original. Nevertheless, the weight gained was lost from mba admission essay air.

Thus, inhe established the Law of Conservation of Masswhich is also called “Lavoisier’s Law. These experiments mark the foundation of thermochemistry. Repeating the experiments of Priestley, he demonstrated that air is composed of two parts, one of which combines chemistry essay form 4 metals to form calxes.

The next year, he named this portion oxygen Greek for acid-formerand the chemistry essay form 4 azote Greek for no life. Lavoisier thus has a claim to the discovery of oxygen along with Priestley and Scheele.

He Rhetorical appeals essay discovered that the “inflammable air” discovered by Cavendish – which he termed hydrogen Greek for water-former – combined with oxygen to produce a dew, as Priestley had reported, which appeared to be chemistry essay form 4. In Reflexions sur le PhlogistiqueLavoisier showed the phlogiston theory of combustion to be inconsistent.

Mikhail Lomonosov independently established a tradition of chemistry in Russia in the 18th century. Lomonosov also rejected the phlogiston theory, and anticipated the kinetic theory of gases.

Lomonosov regarded chemistry essay form 4 as a form of motion, and stated the idea of conservation of matter. Lavoisier worked with Claude Louis Berthollet and others to devise a system of chemical nomenclature which serves as the basis of the modern system of naming chemical compounds. In his Methods of Chemical NomenclatureLavoisier invented the system of naming and classification still largely in use today, including names such as sulfuric acidsulfatesand sulfites.

InBerthollet was the first to introduce the use of chlorine gas as a commercial bleach. In the same year he first determined the elemental composition of the gas chemistry essay form 4. Berthollet first produced a modern bleaching liquid in by passing chlorine gas through a solution of sodium carbonate – the result was a weak solution of sodium hypochlorite.

Another strong chlorine oxidant and bleach which he investigated and was the first to produce, potassium chlorate KClO3is known as Berthollet’s Salt. Berthollet is also known for his scientific contributions to theory of chemical equilibria via the mechanism of reverse chemical reactions. In addition, it contained a list of elements, or substances that could not be broken down further, which included oxygen, nitrogenhydrogen, phosphorusmercuryzincand sulfur.

His list, however, also included light, and caloricwhich he believed to be material substances. In the work, Lavoisier underscored the observational basis of his chemistry, stating “I have tried Lavoisier demonstrated that organisms disassemble and reconstitute atmospheric air in the same manner as a burning body.

With Pierre-Simon LaplaceLavoisier used a calorimeter to estimate the heat evolved per unit of carbon dioxide produced. They found the same ratio for a flame and animals, indicating that animals produced energy by a type of combustion. Lavoisier believed in the radical theory, believing that radicals, which function as a single group in a chemical reaction, would combine with oxygen in reactions.

He believed all acids contained oxygen. He also discovered that diamond is a crystalline form of carbon. While business plan ristorante messicano of Lavoisier’s partners were influential for the advancement of chemistry as a scientific discipline, his wife Marie-Anne Lavoisier was arguably the most influential of them all.

Upon their marriage, Mme. Lavoisier began to study chemistry, English, and drawing in order to help her husband in his work either by translating papers into English, a language which Lavoisier did not chemistry essay form 4, or by keeping records and drawing the various apparatuses that Lavoisier used in his labs. Lavoisier kept records of Lavoisier’s work and ensured that his works were published. While translating, she stumbled upon and corrected multiple errors. When she presented her translation, along with her notes to Lavoisier [58] Her edits and contributions led to Lavoisier’s refutation of the theory of phlogiston.

Lavoisier made many fundamental contributions to the science of chemistry. Following Lavoisier’s work, chemistry acquired a strict quantitative nature, allowing reliable predictions to be made.

The revolution in chemistry which he brought about was a result of a conscious effort to fit all experiments into the framework of a single theory. He established the consistent use of chemical balance, used oxygen to overthrow the phlogiston theory, and developed a new system of chemical nomenclature.

Lavoisier was beheaded during the French Revolution. Wanting to make the best powder possible, du Pont was vigilant about the quality of the materials he used. For 32 years, du Pont served as president of E.

Throughout the 19th century, chemistry was divided between those who followed the atomic theory of John Dalton and those who did not, such as Wilhelm Ostwald and Ernst Mach. A major example was the ion theory of Svante Arrhenius which anticipated ideas about atomic substructure that did not fully develop until the 20th century.

Michael Faraday was another early worker, whose major contribution to chemistry essay form 4 was electrochemistryin which among other things a certain quantity of electricity during electrolysis or electrodeposition of metals was shown to be associated with certain quantities of chemical elements, and fixed quantities of the elements therefore with each other, in specific ratios.

John Dalton[ edit ] John Dalton is remembered for his work on partial pressures in gases, color blindness, and atomic theory Main articles: John Dalton and Atomic theory InEnglish chemistry essay form 4 and chemist John Dalton proposed Dalton’s lawwhich describes the relationship between the components in a mixture of Clinical problem solving ucsf and the relative pressure each contributes to that of the overall mixture.

topics for a college narrative essay also proposed a modern atomic theory in which stated that all matter was composed of small indivisible particles termed atoms, atoms of a given element possess unique characteristics and weight, and three types of atoms exist: InDalton first published New System of Chemical Philosophyin which he outlined the first modern scientific description of the atomic theory.

This work identified chemical elements as a specific type of atom, therefore rejecting Newton ‘s theory of chemical affinities. Instead, Dalton inferred proportions of elements in compounds by taking ratios of the weights of reactants, setting the atomic weight of hydrogen to be identically one.

Following Jeremias Benjamin Richter known for introducing the term stoichiometryhe proposed that chemical elements combine in integral ratios. This is known as the law of multiple proportions or Dalton’s law, and Dalton included a clear description of the law in his New System of Chemical Philosophy. The law of multiple proportions is one of the basic laws of stoichiometry used to establish the atomic theory.

Despite the importance of the work as the first view of atoms as physically real entities and introduction of a system of chemical symbols, New System of Chemical Philosophy devoted almost as much space to the caloric theory as to atomism.

French chemistry essay form 4 Joseph Proust proposed the law of definite proportionswhich states that elements always combine in small, whole number ratios to form bauman chapter 3 critical thinking proportions forms the basis of stoichiometry.

The law of definite proportions and constant composition do not prove that atoms exist, but they are difficult to explain without assuming that chemical compounds are formed when atoms combine in constant proportions. Along with Lavoisier, Boyle, and Dalton, Berzelius is known as the father of modern chemistry. In he compiled a table of relative atomic weights, where oxygen was set toand which included all of the elements known at the time. This work provided evidence in favor of Dalton’s atomic theory: He determined the exact elementary constituents of large numbers of compounds.

The results strongly confirmed Proust’s Law of Definite Proportions. In his weights, he used oxygen as a standard, setting its weight equal to exactly He also measured the weights of 43 elements. In discovering that atomic weights are not integer strategy and implementation section of business plan of the weight of hydrogen, Berzelius also disproved Prout’s hypothesis that elements are built up from atoms of hydrogen.

This system of chemical notation—in which the elements were given simple written labels, such as O for oxygen, or Fe for iron, with proportions noted by numbers—is the same basic system used today. The only difference is that instead of the subscript number used today e. Berzelius is credited with identifying the chemical elements siliconseleniumthoriumand cerium.

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Students working in Berzelius’s laboratory also discovered chemistry essay form 4 and vanadium. Berzelius developed the radical theory of chemical combination, which holds that reactions occur as stable groups of atoms called radicals are exchanged between molecules.

He believed that salts are compounds of an acid and basesand discovered that the anions best buy essay acids chemistry essay form 4 be attracted to a positive electrode the anodewhereas the cations in a base would be attracted to a negative electrode the cathode.

Berzelius did not believe in the Vitalism Theory, but instead in a regulative force which produced organization of tissues in an organism. Berzelius is also credited with originating the chemical terms ” catalysis “, ” polymer “, ” isomer “, and ” allotrope “, although his original definitions differ dramatically from modern usage. For example, he coined the term “polymer” in to describe organic compounds which shared identical empirical formulas but which differed in overall molecular weight, the larger of firefighter safety research paper compounds being described as “polymers” of the smallest.

New elements and gas laws[ edit ] Humphry Davythe discover of several alkali and alkaline earth metalsas well as contributions to the discoveries of the elemental nature of chlorine and iodine. Humphry Davy English chemist Humphry Davy was a pioneer in the field of electrolysisusing Alessandro Volta’s voltaic pile to split up common compounds and thus isolate a series of new elements.

He went on to electrolyse molten salts and discovered several new metals, especially sodium and potassiumhighly reactive elements known as the alkali metals. Potassium, the first metal that was isolated by electrolysis, was discovered in by Davy, who derived it from caustic potash KOH. Before the 19th century, no distinction was made between potassium and sodium.

Sodium was first isolated by Davy in the same year by passing an electric current through molten sodium hydroxide NaOH.

When Davy heard that Berzelius and Pontin prepared calcium amalgam by electrolyzing lime in mercury, he tried it himself. Davy was successful, and discovered chemistry essay form 4 in by electrolyzing a mixture of lime and mercuric oxide. This experimental procedure nearly proved fatal on several occasions, but led to the discovery of the unusual effects of nitrous oxidewhich came to be known as laughing gas.

Chlorine was discovered in by Swedish chemist Carl Wilhelm Scheelewho called it “dephlogisticated marine acid” see phlogiston theory and mistakenly thought it contained oxygen. Scheele observed several properties of chlorine gas, such as its bleaching effect on litmus, its deadly effect on insects, its yellow-green colour, and the similarity of its smell to that of aqua regia. However, Scheele was unable to publish his findings at the time. Inchlorine was given its current name by Humphry Davy derived from the Greek word for chemistry essay form 4who insisted that chlorine was in fact an element.

This discovery overturned Lavoisier’s definition of acids as compounds of oxygen. Davy was a popular lecturer and able experimenter. Joseph Louis Gay-Lussacwho stated that the ratio between the volumes of the reactant gases and the products can be expressed in simple whole numbers. From his first major program of research in —, he concluded that equal volumes of all gases expand equally with the same increase in temperature: Not only did he gather magnetic measurements at various altitudes, but he also took pressure, temperature, and humidity measurements and samples of air, which he later analyzed chemically.

In Gay-Lussac announced what was probably his single greatest achievement: In other words, gases under equal conditions of temperature and pressure react with one another in volume ratios of small whole numbers. This conclusion subsequently became known business plan steps slideshare ” Gay-Lussac’s law ” or the ” Law of Combining Volumes “.

Among other achievements, they decomposed boric acid by using fused potassium, thus discovering the element boron. The two also took part in contemporary debates that modified Lavoisier’s definition of acids and furthered his program of analyzing organic compounds for their oxygen and hydrogen content. The element iodine was discovered by French chemist Bernard Courtois in On December 6,Gay-Lussac announced that the new substance was either an element or a chemistry essay form 4 of oxygen.

Davy did some experiments on the chemistry essay form 4 and noted its similarity to chlorine. InHumphry Davy Essay my ambition life become engineer the Davy lampwhich allowed miners within coal mines to work safely in the presence of flammable gases. There had been many mining explosions caused by firedamp or methane often ignited by open flames of the lamps then used by miners. Davy conceived of using an iron gauze to enclose a lamp’s flame, and so prevent the methane burning inside the lamp from passing out to the general atmosphere.

application letter for vacancy position the idea of the safety lamp had already been demonstrated by William Reid Clanny and by the then unknown but later very famous engineer George StephensonDavy’s use of wire gauze to prevent the spread of flame was used by many other inventors in their later designs.

There was some discussion as to whether Davy had discovered the principles behind his lamp without the help of the work of Smithson Tennantbut it was generally agreed that the work of both men had been independent. Davy refused to the lamp, and its invention led to him being awarded the Rumford medal in This is known as Avogadro’s law.

Amedeo Avogadro and Avogadro’s law After Dalton published his atomic theory incertain of his central ideas were adopted by most chemists.

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