Consider the energy level diagram sketch below.

Which of the transitions, a) to e), represents a hydrogen atom in its ground state absorbing light and ionising?

Calculate the frequency of a photon that has a wavelength of 293 nm.

Note: c = 2.998 × 10⁸ m s^–1.

Match the rule violations to the corresponding rule.

Calculate the wavelength, in nm, of a photon that has a frequency of 2.56 x 10¹⁵ Hz.

Note: c = 2.998 × 10⁸ m s^–1.

Which of the following is the correct abbreviated electron configuration for a silicon atom in its ground state?

Consider the energy level diagram sketch below.

Which of the transitions, a) - e), represents a hydrogen atom in an excited state emitting light and ending up in its ground state?

Consider the following exothermic reaction at equilibrium: 

Nitrosyl bromide decomposes according to the following equation:

Dinitrogentetraoxide partially decomposes according to the following equilibrium:

Consider the following equilibrium reaction:

H₂CO₃ (aq)  ⇌  H⁺ (aq) + HCO₃^– (aq);     K = 5.0 x 10^–7

 If the initial concentrations of the species are:

[H₂CO₃] = 0.100 M;   [H⁺] = 2.00 x 10^–5 M;   [HCO₃^–] = 2.00 x 10^–3 M

Which one of the statements below describes the relationship between Q and K and then the correct direction of chemical change?