In the nine unknown solutions experiment there was nine solutions that were labeled with just numbers from one to nine and all of these one to nine solutions were mixed together randomly to see what kind of reaction it would form. There were mostly no reactions being formed but the reactions that were soluble and insoluble formed different colors of precipitate. The main importance in finding the nine unknown solutions was to prevent any inaccuracies that might form when there is a chemical compound forming. This experiment was done to determine the identity of the nine unknown solutions like color (physical trait), and chemical characteristics.…
When hydrochloric acid was added to the unknown and known solutions, both resulted in no reaction. This also occurred when potassium hydroxide was added to both of the solutions. Barium chloride was then added to the two solutions, which resulted in a cloudy white precipitate from both of the solutions. A cloudy white precipitate also formed when calcium nitrate and ammonium nitrate were added to both the unknown and known solutions. These reactivity tests were conducted in order to establish how the unknown compound would react with acids, bases, and salts.…
13. The data from the mixed melting point led to the conclusion of 2-chlorobenzoic acid to be the unknown. 14. If the data was inconclusive, the experiment could be redone. An error most likely occurred along the way.…
Percent Copper In Brass Lab Conclusion Emily Oleisky The purpose of this lab was to observe the amount of light a solution absorbs, and use the relationships in the Beer-Lambert Law to determine the quantity of a certain compound within a complex sample. First, the relationships between wavelength, concentration, and absorbance were determined. This lab focused on identifying the absorption of copper in various brass samples, and finding the percent copper in brass. In the first activity of the lab, the scientist was trying to determine the difference in molar absorptivity across various wavelengths of multiple salt solutions.…
In that experiment, it is a bit different because it is finding which glow stick will glow brighter when placed in different temperatures. The last experiment done with glow sticks has the question of “why are glow sticks different colors?” (Helmenstine). Later in the experiment, it was figured out that different chemical reactions make different…
My hypothesis was rejected. There hadn't been several chemical changes, as I predicted. There had only been chemical changes in color shown in the data table. In row B, there had been a light blue, cloudy color change. In row C, there had been a slight green color change, which should have had a chemical reaction, and remained a clear color.…
1. Polarity – if the polarities of the pigments were known then it would have been known that the most polar pigments would have eluted first and the least polar would have been last. 2. Gradient elution should be used when polarities vary. Isocratic elution should be used when the polarities are similar.…
1. If the molarity of the NaOH solution is increased, it would take less drops to observe a colour change. A higher concentration lowers the amount of solution required to produce a reaction due to the presence of more molecules and a higher frequency rate, therefore less of the substance is needed to cause an equilibrium shift. 2.…
You would use the material sodium to give it a very distinct yellow and orange, the materials copper and barium give you both green and blue colors, and the materials calcium and strontium. The chemical energy locked inside the firework is converted into four other kinds of energy. Heat, light, sound, and the kinetic energy of movement.…
Which metals produce similar flame colors (according to your naked eye)? NaCl and NaNo3 both turned the color orange. 2. What metal ions are in the unknown solutions A and B from the barrels on the vacant lot? Clearly, and in detail, explain your reasoning.…
Flame color depends on the temperature of the flame. The hottest part of a flame, the base, glows blue, and the cooler parts are orange and…
In this experiment, two cations in an unknown solution were found using qualitative analysis. For Part A, the solution was to contain either silver or lead, while in Part B, the solution that was set on the side form Part A was identified to contain either calcium or barium. Part C explored a different method through the use of cation flame tests to observe colored flames from six metal chloride solutions. In Part A, the initial step was to add HCl to the unknown sample.…
Observations and Results: There were a variety of physical observations that could be made as the experiment progressed. Initially after the addition of the sulfuric acid from the Repipet, the solution was a slight yellow…
The burning of magnesium in open air causes a chemical reaction that forms the compound, magnesium oxide. This reaction occurs due to the heat that provides energy to activate the reaction. A blinding white flame will burn as the reaction occurs. In this lab, magnesium is burned in an open crucible over a Bunsen burner several times until the magnesium ceases to burn. This process allows for the magnesium to completely react with the oxygen found in the open air, forming the chemical compound magnesium oxide.…
Experiment 1: Alkanes & alkenes: Combustion and action of sulphuric acid. Objective: To make careful observations and compare the difference(s) between alkanes and alkenes. Introduction: Hydrocarbons are composed exclusively of oxygen and hydrogen. There are three types of homogeneous hydrocarbons (whose members differ by one CH2 unit): alkanes, alkenes and alkynes. The difference between these three groups is in the bond types between the carbons.…