how to identify bond angles
Read about VSEPR theory
http://www.google.com/search?q=vsepr+theory&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
thx
but wat is a good way to remember it
Practice it enough that you have it memorized.
To identify bond angles, you need to consider the molecular geometry of a molecule. Here's a step-by-step process to help you:
1. Determine the Lewis structure: Start by drawing the Lewis structure of the molecule, indicating all the atoms and their bonds.
2. Determine the electron pair geometry: The electron pair geometry describes the arrangement of all electron groups (bonding and non-bonding) around the central atom. This geometry is determined by the number of electron groups present. Count all the bonding pairs and any lone pairs of electrons around the central atom.
3. Determine the molecular geometry: The molecular geometry describes the arrangement of only the bonding pairs of electrons around the central atom. To determine this, you will need to consider the effect of lone pairs on the bonding pairs. Non-bonding electrons tend to occupy more space than bonding electrons, affecting the shape of the molecule.
4. Identify the bond angles: Once you have established the molecular geometry, you can determine the bond angles. The bond angles are the angles between the bonds formed by the central atom with the surrounding atoms. These angles are specific to each molecular geometry.
Here are some common molecular geometries and their corresponding bond angles:
- Linear: 180°
- Trigonal planar: 120°
- Tetrahedral: 109.5°
- Trigonal pyramidal: ~107°
- Bent (V-shaped): <120°
It's important to note that these angles are idealized and may vary slightly due to the presence of lone pairs or other factors.
By following these steps, you can determine the bond angles of various molecules.