IB Chemistry HL S1.3 Electron configurations questions

Exam-style multiple choice and written questions with full markschemes. Check multiple choice answers straight away, or type, photograph or draw a written answer and get it marked.

Type
Multiple choiceWritten
Difficulty
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Question 1

Paper 2Easy5 marks

A student observes light from a hydrogen discharge tube using a spectroscope. Four emission lines are measured.

Wavelength / nm
656.3
486.1
434.0
410.2
(a)

State whether the spectrum consists of continuous or line emission.

[1]
(b)

State what happens to an electron when one of these photons is emitted.

[1]
(c)

Determine which photon, with wavelength 656.3 nm or 434.0 nm, has the greater energy. Justify your answer.

[2]
(d)

As the wavelength decreases through the values in the table, state how the spacing between successive spectral lines changes.

[1]

Question 2

Paper 2Medium7 marks

The wavelength corresponding to the limit of convergence at higher frequency in the emission spectrum of gaseous element Q is 285.7 nm285.7\ \mathrm{nm}

A database gives the following successive ionization energies for Q.

Ionization energyValue / kJ mol−1\mathrm{kJ\,mol^{-1}}
First419
Second3052
Third4420
Fourth5877
(a)

Calculate the first ionization energy of Q in kJ mol−1\mathrm{kJ\,mol^{-1}} using the data booklet. Give your answer to three significant figures.

[3]
(b)

Use your result from (a) and the successive ionization energy data.

(i)

State whether your result from (a) agrees with the database value for the first ionization energy to three significant figures.

[1]
(ii)

Deduce the group of Q, explaining your deduction using the successive ionization energy data.

[3]

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