You're viewing 1 free preview question for Chemistry SL — subscribe to unlock 74 more, plus the Full Question Bank, Mock Papers & Worksheets.Upgrade

The Nuclear Atom · Paper 2 — Free Chemistry SL Practice Questions

1MasterySAQ-SStructure of the atom: Protons, neutrons, electrons5 marksPaper 2~8 min
Bohr's model of the hydrogen atom describes electrons occupying discrete energy levels. A hydrogen atom in its ground state absorbs a photon and undergoes electronic excitation.
(a)
State the principal quantum number, nn, of the energy level to which the electron is promoted when it absorbs a photon of energy 1.64×10−18 J1.64 \times 10^{-18}\,\text{J}, given that the ground state corresponds to n=1n = 1. [1 mark]
(b)
Describe the change in the electron's distance from the nucleus and its energy as it moves from n=1n = 1 to n=2n = 2. [2 marks]
(c)
Calculate the wavelength, in nm, of the photon absorbed to cause the n=1→n=2n = 1 \rightarrow n = 2 transition. E=1.64×10−18 J,c=3.00×108 m s−1,h=6.63×10−34 J sE = 1.64 \times 10^{-18}\,\text{J},\quad c = 3.00 \times 10^{8}\,\text{m\,s}^{-1},\quad h = 6.63 \times 10^{-34}\,\text{J\,s} [2 marks]
diagram

Solutions

Questions 2-75

Unlock these questions with Premium

Sign Up →

That's every free question here — 1 of 75.

+74 more questions, plus Mock Papers & Worksheets, are waiting in Premium.

Upgrade