what are structural formulas??

also is this correct

hybridization is the setting aside of p orbitals in order to form bonds (pi bonds)

Structural formulas show how atoms are linked to one another in a formula. For example, for CO2 the structural formula is O=C=O. For NH3 it is

H-N-H
|
H
It is difficult to show structural formulas here. Here are some more in the in the web page below:
http://www.cartage.org.lb/en/themes/sciences/chemistry/Organicchemistry/StructuralFormulas/StructuralFormulas.htm

Structural formulas show the connectivity of atoms. For example, CH4 would look like this.

&nbsp H
&nbsp |
H-C-H
&nbsp |
&nbsp H
Hope that looks ok. If not I'll try to find a better drawing on the Internet.
Hybridization is not what you have tried to define. Hybridization is the merging of orbitals to make "hybrids" of them. For example, C has 6 electrons
1s2 2s2 2p2. The four outside electrons are the bonding elecrtrons.
What happens for most compounds of carbon is NOT that it forms bonds with the two 2p orbitals nor even with the third 2p orbital. What happens is that one of the two 2s electrons is promoted to the 2p so it looks like this.
1s2 2s1 2p3. (Actually, we never see that but I'm trying to do it step wise to help with the explanation). So we now have a half filled 2s orbital and three half filled 2p orbitals. Next, the half filled orbitals merge together to form sp hybrid orbitals. The sp orbitals are made up of about 25% s and 75% p and they are all of the same energy. Thus we have 4 sp orbitals and those form (usually) four bonds with carbon. We don't have s bonds and p bonds but sp bonds.

My attempt to draw the structural formula for NH3 did not work out. The downward -H bond should be linked to N (nitrogen).

Last try at this.

&nbsp&nbsp&nbsp H
&nbsp&nbsp&nbsp |
H-N:
&nbsp&nbsp&nbsp |
&nbsp&nbsp&nbsp H

&nbsp&nbsp&nbsp H
&nbsp&nbsp&nbsp |
H-C-H
&nbsp&nbsp&nbsp |
&nbsp&nbsp&nbsp H

Structural formulas are a way to represent the structure of a molecule using symbols. They show how the atoms are connected to each other and the arrangement of bonds between them. Each atom is represented by its chemical symbol, and lines represent the bonds between atoms. For example, in the structural formula of methane (CH4), a single line is used to indicate a single bond between carbon (C) and each of the four hydrogen (H) atoms.

Now, regarding your statement about hybridization, it is not entirely accurate. Hybridization is a concept in chemistry that involves the mixing (or hybridizing) of atomic orbitals to form new hybrid orbitals. These new orbitals have different shapes and energies than the original atomic orbitals. Hybridization occurs when there is a need to explain the observed molecular geometry.

In the case of pi bonds, they are formed by the overlap of p orbitals of adjacent atoms. Pi bonds are not a result of hybridization but rather a consequence of unhybridized p orbitals coming together in a parallel fashion. It is important to note that hybridization and pi bonds are related but distinct concepts in chemistry.

To determine the hybridization of an atom in a molecule, you need to follow these steps:
1. Determine the steric number of the atom, which is the sum of the number of sigma bonds and lone pairs around the atom.
2. Based on the steric number, determine the hybridization of the atom.

For example, for an atom with a steric number of 4, the atom is sp3 hybridized, and for an atom with a steric number of 3, the atom is sp2 hybridized.

Remember, hybridization helps explain the geometries of molecules, while pi bonds are formed by the overlap of unhybridized p orbitals.