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WorksheetsL6th OCR Shapes of molecules
Total questions: 26
Worksheet time: 19mins
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
Predict the BCl3 bond angle
180
120
90
109.5
What is the shape of the molecule HCl?
Linear
Bent
Non-Linear
Trigonal Planar
What is the name of the electrons that don't form bonds?
Bonding pairs of electrons
Lone pairs of electrons
Unvalence pairs of electrons
Outer pairs of electrons
F2, Br2 and I2 all have a shape of:
Bent
Non-Linear
Linear
Trigonal planar
What is the shape an bond angle of this molecule?
Trigonal Planar, 120
Bent, 120
Linear, 180
Tetrahedral, 109.5
How many electron pairs are around the central atom in an octahedral shape? Also please state the bond angle.
8 electron pairs, bond angle of 90
8 electron pairs, bond angle of 120
6 electron pairs, bond angle of 120
6 electron pairs, bond angle of 90
For each lone pair added how much is the bond angle reduced by?
4.5 degrees
1.5 degrees
3.5 degrees
2.5 degrees
Why does a lone pairs repel more strongly than a bonded pair?
A lone pair of electrons are further away to the central atom and occupy more space than a bonded pair.
A lone pair of electrons are further away to the central atom and occupy less space than a bonded pair.
A lone pair of electrons are closer to the central atom and occupies more space than a bonded pair.
A lone pair of electrons are closer to the central atom and occupies less space that a bonded pair.
What do 2 or more bonded regions in a molecule do?
Attract each other
Nothing
Repel one another as far apart as possible
Cross over
What shape does the molecule BF3 have?
Tetrahedral
trigonal planar
pyramidal
non-linear
CO32- has 3 regions of electron density. What bond angle will it have?
109.5 degrees
120 degrees
104.5 degrees
90 degrees
What is the shape of the molecule called that has 2 regions of electron density?
Non-linear
Linear
pyramidal
tetrahedral
What bond angle does the sulfate ion have?
120 degrees
104.5 degrees
109.5 degrees
180 degrees
What is the bond angle in methane ?
120 degrees
107 degrees
109.5
130 degrees
What is the bond angle in CO2
180 degrees
120 degrees
109.5 degrees
120 degrees
If the number of electron pairs increase what happens to the bond angle?
The bond angle degreases
The bond angle increases
The bond angle stays the same
The bond angle will decrease by 3 times the amount each time
