’ Law Essay, Research Paper
Hess’ Law:Work to be done:Find enthalpy change by measuring temperature change of a reaction. Chemicals and apparatus: Thermometer Scale Isolator NaOH, solid NaOH, 0.50M solution Acetic acid, 0.50M and 0.25M Lab: Reaction 1) The temperature of 200ml water that I poured into the isolator was 23.0єC. To that I added 1.97g solid NaOH and let the reaction take place. After a while I measured the temperature to 24.9єC а rT = 1.9єC. The number of mole NaOH is 1.97 / 40 = 0.049 mol. Reaction 2) In this experiment I used 100ml 0.50M acetic acid, and to that I added 100ml 0.50M liquid NaOH. The temperature of the acetic acid was 23єC and the temperature of the NaOH was 22єC. So the average, and the number I use will be 22.5єC. After the reaction the temperature of the solution was 25єC, so rT = 2.5єC. The number of mole NaOH is 0.50 * .100 = 0.050 mol. Reaction 3) In the third reaction I used 200ml 0.25M acetic acid with a temperature of 22.5єC, that I added to 2.00g NaOH. The temperature after the reaction was 27єC, so rT = 4.5єC. And the number of mole NaOH in the reaction was 2.00 / 40 = 0.05 mol. The same amount NaOH has been used in all three reactions, and the same amount of liquid also, 200ml. In reaction two and three is also the amount acetic acid the same.I can now calculate the enthalpy changes in each case: H = c m T, and since the same mass has been used, and since I can use the same c in all three cases H = 0.84 T (c = 4.2, m = 0.200g) rH1 = 1.596 rH2 = 2.1 rH3 = 3.78 According to Hess’ Law you should be able to calculate the enthalpy change for a reaction which is the sum of two (or more) reactions with known enthalpy change, so:NaOH(s) а NaOH(aq) (1) NaOH(aq) + HCl а NaCl + H2O (2) NaOH(s) + HCl а NaCl + H2O (3) (3) – (2) = (1) and we can also see that rH3 – rH2 ” rH1 Other results in class: GroupH1H2H3H3-H2 11.262.13.361.26 21.672.33.271.47 36.821.898.46.51 41.262.944.21.26 51.602.13.781.68 61.5962.13.363.36 72.52.14.22.1(The results of group 3 was probably because they isolated more.)
Другие работы по теме:
Античастицы
Для всякой известной элементарной частицы имеется вероятность найти античастицу — то есть частицу с той же массой, но противоположными другими физическими характеристиками.
Indians Immigrating To America Essay Research Paper
Their homeland has the second largest population in the world, yet in America they form one of our smallest minorities. Americans were influenced by their beliefs long before the first immigrants arrived, and an important interchange of ideas has continued to the present day. Although many came to America as early as the turn of the century, they were denied citizenship until a congressional act granted it in 1946.
Events Leading Up To The Vietnam War
Essay, Research Paper History of Foreign Intervention Vietnam, bordered by China to the north, Laos to the west and northwest, and Cambodia (now Kampuchea) to the southwest, is an S-shaped country no bigger than the state of Florida. Vietnam occupies the eastern coast of the Indochinese Peninsula. For thousands of years the people of Vietnam have lived with constant foreign intervention and colonization (by the French).
The Gaian Theory Essay Research Paper IntroductionContinental
The Gaian Theory Essay, Research Paper Introduction Continental drift is the theory that the positions of the earth’s continents have moved considerable distances throughout geologic time. A German meteorologist, by the name of Alfred Wegener, proposed the first comprehensive theory of continental drift in 1912.
JAIL SUICIDES PREVENTION Essay Research Paper The
JAIL SUICIDES PREVENTION Essay, Research Paper The United States is plagued by a countless number of social dilemmas. Although not in constant public scrutiny, suicide is a serious problem which has seemed to
Karl Marx Essay Research Paper 181883 German
Karl Marx Essay, Research Paper 1818-83, German social philosopher and revolutionary; with Friedrich Engels, a founder of modern Socialism and Communism. The son of a lawyer, he studied
Nuremburg Trials Essay Research Paper At the
Nuremburg Trials Essay, Research Paper At the end of the Second World War, it was found that the Germans had committed atrocities against the Jews of Europe in what came to be known as The
Nuremberg Trials
– Martin Bormann Essay, Research Paper On the night of October 15, 1946, ten of the twelve major war criminals, condemned to death at the Nuremberg trials, were executed. Of the two who eluded the hangman, one was ReichMarshal Hermann Goring, who committed suicide by swallowing a lethal vial of cyanide two hours before his execution.
The Nuremberg War Crimes Tribunal Essay Research
Paper In early October 1945, the four powers victorious after the Second World War issued an indictment against 24 men and six organizations. Fifty years ago the Prosecution?s opening statement was read by Associate United States Supreme Court Justice Robert Jackson. Just eight months prior to that reading, the very building in which the historical trial took place was “an enemy fortress in the hands of German troops”
3Rd Reich Essay Research Paper The ThirdReichWorld
3Rd Reich Essay, Research Paper The Third Reich World War I had come to a close, and Germany was in ruins. Not just physical ruins, but also in mental ruins. Germany’s government and economy had been destroyed.
Telecommuting Essay Research Paper Telecommuting The Evolution
Telecommuting Essay, Research Paper Telecommuting: The Evolution of a New Work Environment David Hess The days of reporting to the office at 8:00 am, taking lunch at noon, and driving home at 5:00, have eroded over the past few decades. People today are faced with different situations that make this type of routine unfeasible if they want to have a career.
The Trials At Nuremburg Essay Research Paper
November 20, 1945: The beginning of the Nuremberg trial of Nazi War Criminals The opening day of the Nuremberg trail of Nazi War Criminals began on November 20, 1945. Lord Justice Lawrence, the British president of the international tribunal, oversaw the proceedings against the surviving major leaders of the Third Reich.
Concentration Camps Essay Research Paper Concentration CampsA
Concentration Camps Essay, Research Paper Concentration Camps A concentration camp is where prisoners of war, enemy aliens, and political prisoners are detained and confined, typically under harsh conditions, or place or situation characterized by extremely harsh conditions. The first concentration camps were established in 1933 for confinement of opponents of the Nazi Party.
Freedom Of Expression
– Our First Amendment Rights Are Threatened Essay, Research Paper What is art? Can it be defined in any single painting, or sculpture? Is it even something that can be seen, or does it have to be experienced? The term “art” is so vague that it can be applied to almost anything, really. Mostly, however, art should be that which frees our imagination.
Looking Out The Window Essay Research Paper
Looking out the window, a sign on the side of the road reads, ?speed limit 25?. I think it should be much higher, but I suppose residents of the road want to get out of their driveways without being smashed by a speeding car. I look down at the dashboard, which is covered with beer cans (there?s no bottles because they always end up finding their way out the window and onto signs and other objects), various coins, and assortments of waste products.
Oscar Romero Essay Research Paper March 10
Oscar Romero Essay, Research Paper March 10, 2000 Religion III Oscar Romero was a modern day prophet as well as an advocate of the anawim. He was an amazing man. His life was dedicated to the welfare of the anawim. The anawim of El Salvador were those who were not involved with the military, the guerillas, or the government.
Elivs Presley His Life Essay Research Paper
Elvis Aron Presley was born on January 8, 1935, in one of the two rooms of his parents shotgun shack in Tupelo, Mississippi. Elvis was the first born in a set of twins. However the younger, Jesse Garon, whose name was created to rhyme with his brother s, was still born.
The Angel Of Death Essay Research Paper
The medical professions of Germany, including academic medicine, played a critical role in the evolution of Nazism s programs of human destruction, programs that were based in genocide and the exploitation of the dead. The atrocities associated with the Holocaust are staggering, especially when the words Auschwitz and Mengele are mentioned.
The Early Life Of Karl Marx Essay
, Research Paper Karl Marx s early life was extremely important in shaping the way he thought about society and governments and what he thought could make them better, and his experiences and up-bringing made him a pro-communist writer and believer. Karl Marx was born on May 5th in the year 1818. He was born in the small town of Trier, Germany.
Pangaea Essay Research Paper Since it s
Pangaea Essay, Research Paper Since it s early beginnings some 4.6 billion years ago, the earth has been constantly changing its face. Oceans have become deserts and what was once mountainous terrain has found itself submerged in salt water oceans. Underwater volcanoes create new surfaces daily which one day may host a new species of life.
The Living Machine Essay Research Paper The
The Living Machine Essay, Research Paper The Living Machine We live in an extraordinary era of exploration. We are now able to reach far out into space and deep down into the ocean. We have the advantage with technology such as computers and satellites. We can now simply understand the dynamic forces that shape our Earth.
Overcrowding America By Immigration Essay Research Paper
All over America, some places more than others, immigration has become a major debate for everyone. More than one million people are coming into the United States legally and illegally. According to the US Immigration Guide, written by attorney, Ramon Carrion, legal immigration means people coming into the country with their temporary or permanent visas given out by the government?s consent.
Performance Enhancing Drugs Essay Research Paper Many
Performance Enhancing Drugs Essay, Research Paper Many athletes of all ages are turning towards performance enhancing drugs as a way of improving their performance by giving them that extra edge. This is not only wrong but its cheating and harmful to the athlete.
Journalistic Integrity Essay Research Paper The Media
Journalistic Integrity Essay, Research Paper The Media s Role in Informing the Public We do not often print everything we know, reveals David Lawerence, publisher of the Miami Herald (qtd. in Valente 4). There is a contrast between printing everything that is known, selecting information to disregard, and presenting information that is simply false.
The Reign Of Tsar Nicholas II Essay
, Research Paper Discuss the reign of Nicholas II and analyze the reasons for his failures. The idea that anything Nicholas II could have done to change the
Narcissus
& Goldmund Essay, Research Paper Narcissus & Goldmund, by Herman Hess, contains a distinct cyclical structure. This structure is contributed to through characters, themes,
Corruption In Famous Last Words Essay Research
Paper War is a horrific experience made worse by those who try to control it for their own advantage. In Famous Last Words, Timothy Findley creates a world of intrigue as he describes the tales of conspiracy and corruption for world domination. That made World War II far worse than it otherwise would have been.
Bridgestone Firestone Inc Essay Research Paper
Company Overview Bridgestone/Firestone, Inc., a subsidiary of Bridgestone Corporation, was formed in 1990 when Bridgestone U.S.A. merged with The Firestone Tire & Rubber Company. In addition to manufacturing tires, Bridgestone/Firestone produces a variety of products including air springs, building materials, synthetic and natural rubber, and industrial fibers and textiles.
Hypoglycemia Essay Research Paper HypoglycemiaAbout four years
Hypoglycemia Essay, Research Paper Hypoglycemia About four years ago we started to notice that my dad was having problems sleeping, he was very moody, and he started getting headaches a lot. After it got to a point where my dad was feeling bad every day we all started to worry. So as any normal person would do, my dad went to the hospital to have it checked out.
Siddhartha Essay Research Paper In Herman Hess
Siddhartha Essay, Research Paper In Herman Hess s, Siddhartha, Siddhartha s constant growth and spiritual evolution is elucidated through the symbolism of the snake, the bird and the river.
Plate Tetonics Essay Research Paper Plate TectonicsPlate
Plate Tetonics Essay, Research Paper Plate Tectonics Plate tectonics are a relatively new theory that has revolutionized the way geologists think about the Earth. According to the theory, the surface of the Earth is broken into large plates. The size and position of these plates change over time. The edges of these plates, where they move against each other, are sites of intense geologic activity, such as earthquakes, volcanoes, and mountain building.
Solutions For Homelessness Essay Research Paper Solutions
Solutions For Homelessness Essay, Research Paper Solutions for Homelessness This great nation of awesome power and abundant resources is losing the battle against homelessness. The casualties can be seen on the street corners of every city in American holding an ?I will work for food? sign. Homeless shelters and rescue missions are at full capacity.
Рудольф Гесс
Преданность Гесса фюреру, который поднял его из самых низов до высочайших постов в рейхе, была абсолютной. Погруженный в себя, лишенный высокого интеллекта и демагогического таланта Гесс знал лишь безусловную веру в своего фюрера.