AS/A-Level Chemistry Edexcel- Shapes of Molecules Flashcards
What shape has 2 bonding pairs and no lone pairs?
Linear
What is the angle of a linear shape?
180
What is the shape with 4 bonding pairs and no lone pairs?
Tetrahedral
What is the angle of a tetrahedral shape?
109.5
What shape has 3 bonding pairs and no lone pairs?
Trigonal planar
What is the angle of a trigonal planar?
120
What shape has 5 bonding pairs and no lone pairs?
Trigonal bi pyramidal
What is the angle of a trigonal bipyramidal?
120 and 90
What shape has 6 bonding pairs and no lone pairs?
Octahedral
What is the angle of an octahedral?
90
What shape has 3 bonding pairs and 1 lone pair?
Trigonal pyramidal
What is the angle of a trigonal pyramidal?
107
What shape has 2 bonding pairs and 2 lone pairs?
V-shaped
What is the angle of a v-shaped molecule?
104.5
What is the EPR theory?
Electron pair repulsion theory states that:
-the shape of a molecule or ion is caused by the repulsion between the pairs of electrons, both bond pairs and lone pairs that surround the atom
- the electron pairs arrange themselves around the central atom so that the repulsion between them is at a minimum
- lone pair-lone pair> lone pair-bond pair>bond pair-bond pair
What shape has 4 bonding pairs and 1 lone pair?
Seesaw
What shape has 5 bonding pairs and 1 lone pair?
Square pyramidal
What angle does a square pyramidal have?
90
What shape has 3 lone pairs and 3 bonding pairs?
T shaped
What shape has 4 bonding pairs and 2 lone pairs?
Square Planar
What is the relationship of the amount of lone pairs on angle size?
More lone pairs, smaller the angle as the repulsion brings them together. Repulsion reduces the size of the angle
