FOLLOW-UP QUESTIONS AND EXERCISES 1. Review your observations for the flame test
ID: 543211 • Letter: F
Question
FOLLOW-UP QUESTIONS AND EXERCISES 1. Review your observations for the flame test to answer the following questions. a. Why do the samples have to be heated in the flame before the colored light is emitted? b. The salts you tested contain a metal cation and a non-metal anion. Look at the compounds we tested and determine whether it is the metal or the non-metal that is responsible for the color produced in the flame test for that salt. How can you be sure your answer is correct? Could flame tests be useful in determining identities of metals in a mixture of two or more salts? If so, what problems might arise? If not, why not? c. 2. What are the sourExplanation / Answer
1.a.
Color is related with the wavelenghth and it relates with energy. Electrons will absorb energy during heating of the sample and these electrons will jump from ground state to higher excited state. This absorbed energy can be corelated with wavelength (Energy is inversly proportional to wavelength) and as a result the color appears ( absorption spectra)
2. The metals have loosely bound valence electrons and these electrons can jump at lower energy absorption
( energy supplied in the Lab is sufficient) where as the the required energy for jump of electrons of non-metal is very high ( supplied energy in Lab is not sufficient).Therefore, color produced in the flame test is for metal.
3. Flame test predicts the presence of metal but identify a single metal. It's too difficult to identify the metals in the mixture of salts due to overlap in colors. It can't be distinguish between two colors. So it is not possible .
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.