We know after reading the intro of the experiment that the metallic ions being heated give off distinct colors which are characteristics of that solution or substance, and that the colors vary according to the amount of energy that is Ewing absorbed by the solution or substance (heat), by looking at the above spectrum we see that solutions like the unknown substance, Lithium Nitrate,and Strontium Nitrate with red to pinkish colors have a lower energy than that of Potassium Nitrate and Cupric Nitrate which had blue to purple colors that have a higher amount of energy.
The other solutions, Sodium Nitrate, Barium Nitrate, and Calcium Nitrate fall in the middle of the spectrum, with a moderate amount of energy. Although this method is not error proof, because of the variation of colors and how every human eye interprets color differently, it does offer a way to see how the specific metallic ions react to heat and how much energy they produce when heated, and in that it gives us a way to make a close determination to what the solution might contain.
I would not use this method to make a exact determination of a substance, but it was a neat experiment to be able to observe the different colors. The question states that all chemicals used in this test are “binary compounds”, a binary compound is a chemical compound composed of only two elements. In this experiment, the majority of the solutions were a Alkali Metal r Alkaline Earth Metal mixed with a non metal.
The only one that was not a Alkali or Alkaline Earth metal with non-metal was the Cupric Nitrate which is still a metal, but is located in the transition element region of the periodic table. The portion of the periodic table that is responsible for the color observed is the “metals” portion. B. The yellow flame is most likely some form of Salt or An which is found in many foods. Since the question pointed out spilled into the fire, this would most likely be the best guess.
I did search a bit more on this question on the Internet and mound that one can get a yellow flame by a lack of oxygen provided to the fire. A nice blue flame shows that the fire has the oxygen it needs. C. There are many factors that can lead to errors in flame color identification such as not enough solution on swab and cotton is heated or burnt, a flame with not enough oxygen, the colors themselves vary greatly and what each individual’s human eye perceives will vary, what one person sees as hot or dark pink, another may classify it as a reddish color. D.
The way the colors are produced, is due to the activity of the electrons, as the illusions are being heated, the electrons become excited and move to higher energy levels as they are absorbing the heat, due to their instability they can return to their grounded state and the energy that was absorbed is given off as they come back down to their grounded state, this energy that is dispersed is the electromagnetic energy, and it produces some colors in the visible light spectrum, in which we can observe. Enjoyed this experiment and although am still a bit uneasy dealing with heating substances,l am getting more comfortable in doing so.