Compare and contrast the compounds ch4 and ph3 in terms of covalent bonding, molecular geometry (shape), and intermolecular forces. which substance would experience a stronger attraction between its molecules, and why?

CH4 and PH3 are both covalent since they are composed both of non-metals.  

CH4 is non- polar because of  London forces and has a geometry of tetrahedral  PH3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (IMF) . Since PH3 is polar, it has a stronger IMF 

Copper, silver, aluminum, cobalt, chromium, mercury 

Only one reactant yields 2 or more products. meaning you will only have 1 product and it will break down into 2 or more products. eg. h2o -> h2 + o2