Emission Spectra of Hydrogen and Ionisation

Chemistry · A-Level · WJEC · 13 slides · Not used yet

AS chemistry Emission spectra of hydrogen

hydrogen discharge tube glowing pink laboratory

Sample Questions: Ionisation Energy from Convergence

1. The Lyman series converges to 91.2 nm. Use

IE = hc/\lambda_{lim}

to find the ionisation energy of hydrogen in kJ mol⁻¹.
2. Calculate the convergence limit wavenumber for the Balmer series and hence the ionisation energy, given

R_H = 1.097\times10^7\ \mathrm{m^{-1}}

.
3. Explain why lines crowd together at the series limit, and state how the limit gives the energy needed to detach the electron completely.
4. A sample's convergence limit is 45.6 nm. Identify the element and explain your reasoning from its ionisation energy.

Emission Spectra of Hydrogen and Ionisation

WJEC A-Level Chemistry, Unit 1.1.2
Electron transitions, ionisation energy, and the evidence from hydrogen's line spectrum

Slide 1 of 13

What’s in this lesson

1 Slide 1 Free to read
2 A Four-Line Pink Glow Free to read
3 Energy Levels and Electron Transitions Free to read
4 E = hf and the Wave Equation
5 How a Line Spectrum Forms
6 Order of Increasing Energy of Radiation
7 Explaining the Origin of the Spectrum
8 Emission Versus Absorption Spectra
9 The Hydrogen Emission Spectrum and Series
10 Order the Stages of Ionisation
11 Sample Question: Ionisation Energy from Emission Spectra
12 Practice: Ionisation Enthalpy from Wavelength or Frequency
13 Slide 13

Where this lesson came from

Drafted with BA Productivity’s AI lesson generator, then edited and published by Helen W. They confirmed they checked every slide and that it is theirs to share.

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