Molecular Shapes Flashcards
What shape is a water molecule?
V-shaped molecule
Why is water a v-shaped molecule and not a linear molecule?
Due to the 2 lone pairs in oxygen and the VESPR theory
What shape is the beryllium chloride molecule (BeCl2)? Why?
What bond angle does it have?
It is a linear molecule as the 2 electrons in the Be repel each other as much as possible so they are at a bond angle of 180 degrees.
The bond angle is 180 degrees creating a linear shape
How do you know if a molecule is linear?
the middle molecule will have no lone pairs and two electrons that will repel each other to opposite sides with a bond angle of 180 degrees
What is the shape of boron trichloride (BCl3)?
What is its bond angle?
Triangular planar or trigonal planar
Its bond angle is 120 degrees
How do you know if a molecule is of trigonal planar shape?
The central molecule will have no lone pairs and will have three electrons equally spread out at an angle of 120 degrees
How do you know if the shape of a molecule is a tetrahedron?
The central molecule will have four electrons with no lone pairs
What bond angle will a tetrahedron shaped molecule have?
109.5 degrees
What bond angle will a trigonal planar shaped molecule have?
120 degrees
What bond angle will a linear-shaped molecule have?
180 degrees
Name all 5 shapes of molecules
linear, trigonal planar, pyramidal, v-shaped, tetrahedral
What shape is methane (CH4)
tetrahedron with a bond angle of 109.5 degrees
How do you know if the shape of a molecule is pyramidal?
The central molecule will have one lone pair and 3 electrons with a bond angle of 107.3 degrees
How do you know if the shape of a molecule is v-shaped?
the central atom will have 2 lone pairs and 2 electrons with a bond angle of 104.5 degrees
What sized bond angle will a v-shaped molecule have?
104.5 degrees
