In chemistry, like compounds interact. If a solvent is covalent and nonpolar, it will also dissolve nonpolar covalent compounds. This is because, they contain similar patterns of intermolecular interaction. Hence compounds that posses the same kind of intermolecular interaction can form a solution.
An orbital is the most probable location of an electron. This is because you can't pinpoint the exact location of an electron because as soon as you do it will have moved again, so orbitals are used to find the probability of where a certain electron is.
