Scientists use emission spectra to confirm the presence of an element in materials of unknown co

step 1 All right, guys, we're doing problem 40 of chapter 7. So, time to use emission spectrum to confi

Scientists use emission spectra to confirm the presence of...

Key Concepts

Spectroscopy

Spectroscopy is the study of how matter interacts with electromagnetic radiation. It provides the tools to analyze the emission spectra of materials. By using spectroscopy, scientists can detect the presence of specific elements based on their unique spectral fingerprints.

Unique Spectral Fingerprint

Because the energy differences between electron levels in atoms are unique, the resulting set of emitted wavelengths acts as a fingerprint for each element. This allows scientists to identify elements in unknown samples by comparing the observed emission spectrum to known spectra.

Atomic Energy Levels

Atoms consist of electrons that occupy specific, discrete energy levels. When electrons absorb energy, they can move to higher energy levels, and when they return to lower levels, they emit energy in the form of photons. The differences in energy between these levels are characteristic of each element.

Electron Transitions

The process of electrons moving between energy levels produces emission of photons with specific energies. These photon energies correspond to particular wavelengths of light, which form a unique set of spectral lines for each element.

Transcript

00:01 All right, guys, we're doing problem 40 of chapter 7.

00:03 So, time to use emission spectrum to confirm the presence of an available in materials of unknown composition.

00:12 Why is this possible? so remember, when you have, let's look at the bore model for a second.

00:19 You have certain energy levels in your bore model.

00:24 These are where your electrons can be.

00:28 So you have n equals one, n equals two.

00:34 N equals 3 and equals 4 so if you were to have so oh your elements can absorb or blight and go to from a low energy level to a high energy level this is known us and consequently when they go from a high energy level to a low energy level they will emit light these would be your emission mission lines that you would see this would be the emission spectrum you would see and these and the kind of emission spectrum you're going to get depends on the atom in part depends on the element in particular so let's look at hydrogen hydrogen one s two s two p so you have one electron in your hydrogen atom so you your hydrogen atom can go from this is the ground state it can go to an excited state where you have an electron not in your one s but your two p now you can see now it'll absorb a certain and wavelength of light to make that transition.

01:48 And consequently, when it goes back down from its excited state, which is here back to its ground state, you'll see a certain wave length of light emitted.

01:57 That'll give you a certain emission spectrum for your hydrogen.

02:02 A certain emission spectrum for your hydrogen and atom...

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