Spectroscopy

Spectroscopy is the study of materials based on the wavelength of their reflected or emitted light.

In chemistry, flame spectroscopy is used to identify the elements in an unknown material sample by heating the sample in a flame and observing the color light emitted.  visible-s

Here’s a video that explains how the flame spectrometry lab works…..

Lab: for each sample,  approximate the wavelength of emitted light by finding the corresponding color on this chart. Notice that the wavelengths are given in nanometers.

What is a nanometer?

Then calculate the energy of the emitted light using Plank’s formula;

E = hv = hc/Lambda

where h is Plank’s constant 1.67 x 10^-19 Joules and c is the speed of light 3.0 x 10^8 m/s.

Or use hc = 12,400 eV Angstroms.

Next find the energy levels of each sample element on the resource table and identify which electronic transition is accounting for most of the emitted light.