There are a myriad of ways of identifying an element. One of these methods is the study of colors emitted by the element when exposed to an energy source. Flame tests are a fast and reliable method of determining the identity of unknown metal ions. The Flame Test was designed to test different metal ions to observe the colors that each chemical makes. The Flame Test was also used to identify unknown metallic ions based on the color of the flames produced. In this lab, Petri dishes each containing a different metal ion were doused in ethanol and lighted using a lighter. The metal salts each burned a different color in the fire based on the identity of the ion. By placing atoms of a metal into a flame, electrons in an atom can absorb energy from …show more content…
The metal ion is most likely strontium, because the color emitted by the fire during the burning of this metal most closely matched the color emitted during the burning of the known element strontium. Both the unknown metal ion and the known strontium metal ion burned a red/orange color, so it can be surmised that the identity of the unknown metal ion is strontium. The gas in test tube one is most likely barium, while the gas present in test tubes two and three are most likely mercury and calcium, respectively. These predictions of the identity of the gases were made by the use of a spectroscope. The spectroscope takes an emitted light and splits it up into its component colors. It spreads out the colors of the light, allowing for the identification of elements by the bright lines visible in the spectroscope. Because of the differences in electron configurations, each element has a unique energy requirement for an electron to jump energy levels when excited, it also differs in the amount of energy it releases as it goes back to ground state, thus causing a change in color emitted. The spectroscope breaks down those individual colors and creates a "footprint" that is unique to each element. After observing the accepted patters for a set of elements, the observed spectrum patterns were compared and were matched with the most probable element based on emission spectra. Among the multitude of ways used to identify elements, flame testing and spectroscopy have proven to be a fast, reliable and efficient way of ascertaining the identity of various
Throughout Zac Unger’s memoir Working Fire the Making of a Fireman he struggles to find a place within the fire station and among coworkers. Unlike many of the fellow recruits who spent years preparing to become a firefighter, Unger an Ivy League grad simply responded to a bus stop ad. After realizing that most recruits were either former military, tradesmen or other firefighter’s kids Unger “Mostly I just stayed quite, tried to down play my existence. I figured if I could just make it through the academy without being called out as a fraud, I’d end up a firefighter like the rest of them”(Unger, 22-23). This distinction between Unger and the rest of the recruits was seen as something to be ashamed of, something to hide away.
Over hundreds of thousands of books were burned by the Nazis. The books were burned because they were filled with knowledge and ideas that would spread to people causing the Nazis to lose their perfect society. In the novel, the government burned books because reading creates independent thinking and they wanted the citizens to be ignored, so they could control them without fear of a rebellion. In Fahrenheit 451 by Ray Bradbury symbolism is used to evoke strong meaning throughout the novel. Objects such as the phoenix, salamander, and fire are powerful symbols that occur throughout the novel.
The Great Chicago Fire was an significant event that took place in Chicago, Illinois in 1871. The fire burned more than $200 million dollars worth of property was destroyed along with the death of 300 people, and more than 100,000 people were left homeless. The Great Chicago Fire is believed to be caused by a cow knocking over an oil lamp. Though it is not proven the chances of that happening are very great.
After reviewing the topics in this course I found In the Watch & Think assignment "Death by Fire," Todd Willingham is arrested, tried and convicted of the murders of his three daughters and sentenced to death. Reports from the neighbors in the documentary claimed Willingham was "a very mean man" and by the law enforcement investigator Jimmie Hensley (2010),"You got to count his actions before and after. You got to count his actions during the fire, and things like that that makes the whole story. Not just one little segment of it, its every bit of the story.”
Most young adults in the United States cannot wait to turn 21, so they can drink alcohol, but not this girl. I was from a smaller community and rarely ventured farther than the rusted barb wire fences of my families ranch. However, shortly after my 21st birthday life began to change. Applications got submitted, then came interviews, tests and more interviews. “You’re hired” said a voice on the other end of the phone.
The Fire Stick, utilised by Indigenous Australians has been an essential tool in the practice of traditional land management across Australia since their arrival 50,000+ thousand years ago. Fire Stick Farming (as it is now known) shaped the Australian landscape in ways that benefited both land and Aboriginal people. A practice that increases biodiversity of plant species, offered an abundance of food, both for Aboriginal people and wildlife such as the Kangaroo and Emu, and, in turn, increased populations of these species, which were also a desired food source. Additionally, the practice of burning both small and large areas of land ensured the prevention of larger uncontrollable fires which can devastate landscapes, as evidenced by the common
I.6.2 Flamethrowers The first modern flamethrower, Flammenwerfer, was invented by German engineer Richard Friedler in 1901. These powerful weapons used pressurized air, carbon dioxide or nitrogen to push oil through a nozzle, which was ignited by a charge, producing a jet of flame. Flame throwers were mainly used to clear enemy soldiers from the trenches. Richard Friedler developed two types of flamethrowers – the smaller version Kleinflammenwerfer was a portable one carried by one person, and the larger version Grossflammenwerfer was suitable for transportation, also by a single person. From 1911 onwards, the German army deployed flamethrowers in three specialized battalions.
The students and faculty of Colorado State University’s College of Business and Engineering have developed a new product called the ‘Starlight Stove’ and are extremely excited for its launch. The Starlight Stove has been produced to make life easier for the less fortunate and also improve their standard of living. Their target market was for poor people in Nepal. Only around 11% of the population uses electricity, while the rest use wood, fire, coal as a source of energy. This leads to major air pollution which causes various diseases in women and often leading to the death of young children.
People should be accountable for their action because of their careless mistakes. For example, this person was to excited to go hike at the wilderness and have a good time. When he arrived he felt that he had everything he need for his hike. Later he got injured during his hike. He went through his bag to go check if he has anything to take care of it.
THE TRIANGLE FIRE: THE DEADLIEST INDUSTRIAL DISASTER IN THE HISTORY OF THE CITY Triangle Shirtwaist Company In a tragic event accruing in the early 1900s, resulting in the deaths of 145 factory workers, ultimately led to the development of several laws and regulations that would better shape labor condition throughout the United States. In the paperback “The Triangle Fire” written by Jo Ann E. Argersinger, there are numerous primary sources with personal stories reflecting how this heartrending event shaped survivors of the Triangle Fire. Life in the Shop, All for One, and The Roosevelt I Knew are three primary sources within the text that reveal the labor conditions before and after the fire, perspectives of workers themselves, factory
Compare and Contrast "Powder" v.s. "To Build a Fire" "Powder" and "To Build a Fire" are stories that both put another being at risk because of selfishness. Each story involves extreme cold, snow, and danger. Each story also has a person in charge who puts another in an unsafe situation. The son in "Powder" and the wolf dog in "To Build a Fire" both know the men with them are not making good decisions.
During the Progressive Era (1890’s - 1920’s) there were political reforms and social activism in the United States of America. These acts of social activism and political reformation were to fix issues in urban areas, fix issues in the garment industry, and to make a changes so tragedies (like the Triangle Fire) don’t happen again. The triangle fire serves as a microcosm for the progressive era because they both needed reformation but action was not taken until things became extreme. Right before the Progressive era, America was full of living condition issues, political leader problems, and issues among the people. A serious urban issue included “Laws regulating factories were worthless if not enforced, a truth horribly demonstrated a
Chemical compounds that are available to determine are CaCO3, CaCl2, Ca(NO3)2, mgCl2, MgSO4, KCl, HCl, HC2H3O2, KNO3, K2SO4, NaC2H3O2, Na2CO3, NaCl, Na2SO4, HNO3, H2SO4, HNO3, H2SO4, NH4Cl, (NH4)2SO4, K2CO3, 0.1 M AgNO3, 0.2 M BaCl, Mg(s), NaOH, and KOH. To start this experiment, start with the flame test by gathering a Bunsen burner and a Nichrome wire. Connect the Bunsen burner with a rubber tube to a laboratory gas. To prepare solutions for the flame test, weigh out 0.205 gram of Unknown Compound using an analytical balance and mixed it into a 140 mL beaker filled with 20 mL ionized water. Ensure that solid is completely dissolved using a stirring rod.
Copper Cycle Lab Report Ameerah Alajmi Abstract: A specific amount of Copper will undergo several chemical reactions and then recovered as a solid copper. A and percent recovery will be calculated and sources of loss or gain will be determined. The percent recovery for this experiment was 20.46%.
In industry they need to do this on a bigger scale and with a higher level of accuracy, some industries use a multichannel array spectrometer which is equipped with a fibre optic probe and this helps the acquisition of emission spectra. This has many significant advantages over the usual method in schools because in schools the result is based on people’s opinions which can lead to inaccuracy whereas this piece of equipment analyses the colour itself to give an accurate result. However the price of the school method is far cheaper than the piece of equipment used in industry so the buyers would need to evaluate if the cost of the product is worth the time and accuracy benefits of