Answer:
A compound has atoms of different elements chemically joined together They can't be separated without a chemical reaction.
Temperature means, in this context, movement.
Condensation can be explained by the reduction of temperature of the system. This effect make possible the cohesion forces increases. In other words, the result is coalescence by attractive forces.
Soluble means it can be dissolved
Insoluble means it can't be dissolved
Covalent compounds: N2, CCl4, SiO2 and AlCl3.
Ionic compounds: CaCl2 and LiBr.
Hope this helps!
It is in the 8th row of the periodic table
