The image on the left has been split in half to reveal the five spherical nodes that make up the 5s orbital. The nodal structure of the 5s-orbital is seen in the shape on the right. The higher s-orbitals ( 6s and 7s), while still spherical, are more complicated since they feature more spherical nodes.
The orbits of the planets are coplanar because during the Solar System's formation, the planets formed out of a disk of dust which surrounded the Sun. Because that disk of dust was a disk, all in a plane, all of the planets formed in a plane as well.
http://curious.astro.cornell.edu/about-us/57-our-solar-system/planets-and-dwarf-planets/orbits/242-why-do-all-the-planets-orbit-in-the-same-plane-intermediate
Silicon and Germanium. You can conclude it from its position in the periodic table. Silicon and Germanium are in the same group of the Carbon. That implies that all three have the same number of electrons in the outer orbital, which is responsible for the bonds.
C. Of the products is equal to the reactants.
Good luck out there! :)