Draw the three dimensional structure of hydrazine (H2N-NH2) and answer the following questions about what you have drawn.
How would you describe the geometric arrangement of electron domains around each nitrogen?
linear
trigonal planar
tetrahedral
trigonal bipyramidral
octahedral
How many of the following entities surround each nitrogen?
H, N, electron pair (1-6)
Do the six atoms in the molecule lie in a plane?
Is hydrazine polar?
tetrahedral,2,1,1,no,no
To determine the geometric arrangement of electron domains around each nitrogen in hydrazine (H2N-NH2), we first need to draw the three-dimensional structure of the molecule.
To draw the structure of hydrazine, start by placing one nitrogen atom in the center. Attach two hydrogen atoms to this central nitrogen atom. Then, attach another nitrogen atom to the central nitrogen atom with a single bond, and attach two hydrogen atoms to this second nitrogen atom.
The structure should look like this:
H
|
H - N - N - H
|
H
Now, let's answer the questions based on this structure:
1. Geometric arrangement of electron domains around each nitrogen:
For each nitrogen atom in hydrazine, there are three entities surrounding it: two hydrogen atoms and one electron pair. To determine the geometric arrangement, we need to count the number of electron domains. Here, the nitrogen atom has three electron domains, which corresponds to trigonal pyramidal geometry.
2. Number of entities surrounding each nitrogen:
For each nitrogen atom in hydrazine:
- Hydrogen (H): There are two hydrogen atoms surrounding each nitrogen.
- Nitrogen (N): There is one other nitrogen atom bonded to each nitrogen.
- Electron pair: There is one electron pair around each nitrogen.
3. Planarity of the molecule:
Looking at the structure of hydrazine, we can see that the central nitrogen atom is bonded to two hydrogen atoms and another nitrogen atom. Additionally, both nitrogen atoms have one electron pair each. Based on this arrangement, hydrazine is not planar; it has a bent or V-shaped structure.
4. Polarity of hydrazine:
To determine the polarity of the molecule, we need to consider the individual bond polarities and the overall molecular geometry. In hydrazine, the N-N bond is non-polar since the nitrogen atoms are the same. However, the N-H bonds are polar. Considering the trigonal pyramidal geometry, we can say that hydrazine is a polar molecule.