A popular recipe for chocolate chip cookies requires 4.6 g of NaHCO3 (baking soda). How many formula units of NaHCO3 are required for this recipe? A 2.3 x 10^26
B. 3.3 x 10^22
C. 6.4 x 10^-22
D. 1.9 x 10^26
E. 9.1 x 10^-26

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   

Heat is involved in chemical change in two ways; chemical changes either result in heat being added to or removed from an object, and chemical changes require a certain amount of heat before they can take place.

It's called the falling actionwrong subject by the way