Q1. The hydrogen halides (hydrogen fluoride, hydrogen chloride, hydrogen brom
hydrogen iodide) are important chemicals.
The diagram below represents a molecule of hydrogen chloride.
н.
(i)
What type of particles are represented by the crosses (X)(X)?

Acrystal that absorvd water from air is (blank)a. aqueousb. homogenousc. hygroscopicd. efflorescent

The valence of aluminum is +3, and the valence of the chlorine is -1. the formula fir the aluminum chloride is correctly written as

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?