IB Chemistry化学SL Nuclear Atom真题计算习题汇总

Chemistry SL

Q 6

Which is correct for the following regions of theelectromagnetic spectrum?

A 6

A; the relationship between wavelength, frequency and energy is the greater the energy, the shorter (smaller) the wavelength and the higher the frequency; ultraviolet light is high energy/short wavelength when compared to visible light; infrared light is lower energy/low frequency compare to visible light;

Q 7

In the emission spectrum of hydrogen, which electronic transition would produce a line in the visible region of the electromagnetic spectrum?

A. n = 2 → n = 1

B n = 3 → n = 2

C. n = 2 → n = 3

D. n = ∞ → n = 1

A 7

B; the series of lines found in the visible region of the spectrum is called the Balmer series; they are associated with electronic transitions from upper energy levels down to the n = 2 energy level;

Q 8

Which describes the visible emission spectrum of hydrogen?

A. A series of lines converging at longer wavelength

B. A series of regularly spaced lines

C. A series of lines converging at lower energy

D. A series of lines converging at higher frequency

A 8

D; the line emission spectrum of hydrogen provides evidence for the existence of electron in discrete energy levels, which converge at higher energies; high energy photons of light have a higher frequency and shorter wavelength;

Q 9

What is the order of increasing energy of the orbitals within a single energy level?

A. d < s < f < p

B. s < p < d < f

C. p < s < f < d

D. f < d < p < s

A 9

B; the energy levels are split into sublevels, of which there are four common types: s,p,d and f; each has a characteristic shape and associated energy; the order of increasing energy is s<p<d<f;

Q 10

Draw and label an energy level diagram for the hydrogen atom. In your diagram show how the series of lines in the ultraviolet and visible regions of its emission spectrum are produced, clearly labelling each series.

A 10

See table and diagrams  on page 54