Identifying Elements

6. What is required in order to be able to identify an element based on its flame test colour?

The primary goal of this laboratory is to correctly identify an unknown substance. To achieve this task, one may use various tests that reveal both chemical and physical properties of a substance. By comparing the results of a known substance and the unknown substance, one may eliminate alternative possibilities and more accurately predict the undisclosed compound. Furthermore, by performing these tests, data can be collected and verified regarding chemical and physical properties of the unknown. Understanding the chemical properties of a known substance aids one’s understanding of the unknown based on comparative analysis of the results of the tests.

Using elemental analysis to determine the percent mass composition of each element in a compound is the first step in creating an empirical formula. There are many different types of elemental analysis, but in this experiment gravitational analysis and Beer’s Law are used. Elemental analysis is first used to find the moles of each element, then converted to mass, and then the percent mass of the element in the product is found (2).

The purpose of the lab was to mimic the way Mendeleev placed the elements on the periodic table. Mendeleev was a Russian chemist who produced the first orderly periodic table. Frist, the way the periodic table has been classed alongside the atomic sum and the elements with related properties. Second, the objectives are observeing the physical states of common elements, and the progression of the periodic table, lastly speculate by determining the unknown elements established on the observed progression. As a group we tried to find out where the unknown elements should be placed. Finnly, the information that was given to help us with our process was the state, density, hardness, conductivity, melting point, and color.

Obtain a scintillation vial and label it using tape and a pen. For this part of the lab, make sure to record the mass of the empty vial using a digital scale before proceeding. Now, obtain 0.100 g of the same unknown substance and place into the vial. Record the exact mass again and be sure to take note of any crystal formation that occurs.

The first part of the Identification and Synthesis of an Unknown Ionic Compound (Project 3 Week 1) experiment was to determine the unknown compound #202 that is given to the experimenter. The second part to the experiment (Project 3 Week 2) was to discover different tests the experimenter can conduct in order to prove that they have the specific ionic compound that they discovered in part one. Some of the ways that the experimenter can determine the unknown compound #202 they have includes, preliminary tests, physical state tests, solubility testing, analysis of anions, analysis of cations and flame tests (Dealing with Unknown Compound). There are many ways an experimenter can determine the ionic compound that they have, including pH tests, flammability tests (liquids and solids), solubility tests and heavy metal tests, just to name a few (Identifying Unknown Chemicals in Science Labs).

"Boom! Pow! Sounds that are immediately followed by Ahh's and cheers. For most of us these sounds are all too familiar at annual 4th of July firework celebrations. However, what would a 4th of July celebration be without the glimmering colors of our nation. People all over our country are able to share in the excitement of fireworks partly due to the effects of one element. The glow of a child’s face from “Glow in the dark” paint is able to work - again- because of the effects of one element. However, the feelings of happiness and pleasure are not constricted to only the red glow of paints and flares. This amazing element is also able to bring pleasure and

Our task was to identify the powder in each bag containing different amounts of moles. The mole provides a standard unit of measure that can be used to compare a wide variety of substances. A mole of atoms gives you a physical representation of what a single atom. The molar mass is the total mass of an element divided by one mole in that element. The molar mass can be used as a physical property to identify unknowns by converting it to moles and seeing which one is the closest to the moles in the bag. Our guiding question to answer was: “What are the identities of the unknown compounds?”

During the Atomic line emission lab assignment, my results came out pretty accurate. During the 5th lab it was very fatiguing to determine what the colors were that I had seen. Basically there was a large amount of red. As I went down the line there was a decrease of the rest of the colors, meaning there was more of the red than any other color. As a group we realized this lab emission was a lot like Ge or Germanium based on the spectrum. The first Lab we saw that it was a lot similar to Ce which was Cerium, it is very common to Germanium. With both labs five and 1, you had all the colors except there was no green or violet. Ge had every color except for violet. Our eyes are sensitive to different wavelengths of visible light and we see these

An unknown material can be determined by using simple chemical tests and separations which is called as inorganic qualitative analysis. The separation of cations depends on the difference in their propensity to form precipitates. Separation scheme is used to classify cation into five groups on the basis of their physical and chemical behavior opposed to some reagents. Classification is based on whether there is formation of precipitates or not when metal cations react with the reagent. The five groups of cations and the characteristics of these groups are as follows:

The temporary name and symbol for element 119 is ununennium and uue. All elements have an atomic number such as 62 or 1. It depends on where the element is on the periodic table. For example, hydrogen’s atomic number is 1 because hydrogen is the first element in the periodic table. So the atomic number for ununennium is 119. Element 119 is expected to be an s-block element, an alkali metal and the first element in the 8th period. Ununennium is the element that has the lowest atomic number that has not been synthesized. Many tries have been made by Russian, German, and American teams to synthesize this element, and they have all been unsuccessful. That is experimental evidence that ununennium will likely be far more difficult than the other

They obtained 0.5g from each vial and used a LECO analyser to perform high temperature combustion; they analysed the total carbon and nitrogen in each sample. Another 0.5g sample was digested with nitric acid and analysed for phosphorous, calcium, potassium, magnesium, sodium, sulfur, aluminum, boron, cupper, iron and zinc using Inductively Coupled Plasma Optical Emission Spectrometry (ICPOES). This method relies on the fact that, when excited, elements emit electromagnetic radiations at characteristic

If I was a forensic scientist and I was trying to identify a substance as either a metal or nonmetal I would use certain tests to determine the classification of my substance. I can characterize metals and nonmetals because they both contain different properties.

In the AAS the sample under investigation is atomized and mixed with fuel-gas air mixture and introduced into the burner at a controlled rate. In the flame the solvent is evaporated and the sample is disassociated into atoms. The flame only acts as a trough of atoms of the elements under investigation. A beam of resonance radiation is provided by the hollow cathode lamp of the element under investigation is allowed to pass through the flame and then spectrophotometer assembly where in the transported light from the sample is measured by the photomultiplier, amplifier and recorded in convenient scale. In graphite AAS the technique is similar to flame atomization except that the flame is replaced by an electrically heated closed graphite tube

As the teacher assigns you to a station, in that station are two elements where you must describe the physical features of the element.