L6th OCR Shapes of molecules

What is the best definition of electronegativity?

• An atom’s ability to attract the electron pair in a covalent bond

• It is what the Pauling scale is used as a measure of

• How negative an electron is

• The difference in the nuclear charges of a molecule

Bond angle of water

• 105.4

• 109.5

• 104.5

• 105.5

An example of a pyramidal molecule is NH₃, what is the bond angle?

• 107.0

• 109.5

• 109.0

• 104.5

What is an example of a molecule with four bonding pairs and no lone pairs. It has a bond angle of 109.5

• Ammonia

• Water

• Methane

• Carbon Dioxide

How many bonding pairs and lone pairs for a pyramidal molecule?

• 2 bonding pairs 2 lone pairs

• 2 bonding pairs 0 lone pairs

• 3 bonding pairs 1 lone pairs

• 4 bonding pairs 2 lone pairs

What is the bond angle of an ammonium ion

• 107.0

• 104.5

• 109.5

• 120.0

What are the bond angles from left to right?

• 107.0 and 104.5

• 105.4 and 109.0

• 104.5 and 107.0

• 107.0 and 105.0

What is the correct order of the bonding angles from biggest to smallest?

• Bonding pair/Bonding pair, Lone pair/Bonding pair, Lone pair/Lone pair

• Lone pair/Lone pair, Bonding pair/Bonding pair, Lone pair/bonding pair

• Lone pair/Lone pair, Lone pair/Bonding pair, Bonding pair/Bonding pair

• Lone pair/Lone pair, Bonding pair/Lone pair, Lone pair/Lone pair

What is the best answer for the statement below:

The shape of molecules depends on...

• The electrons surrounding the central atom

• The electron pairs surrounding the central atom

• The type and number of electron pairs surrounding the central atom

• The elements involved in the bonding

Predict the bond angle for NCl₃

• 107

• 109.5

• 104.5

• 180