Chemistry1 Bonding Makeup Worksheet
1.
(i)
State the shape of the electron distribution around the oxygen atom in the water molecule
and state the shape of the molecule.
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(2)
(ii)
State and explain the value of the HOH bond angle.
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(2)
(Total 4 marks)
2.
(a)
Draw the Lewis structure of methanoic acid, HCOOH.
(1)
(b)
In methanoic acid, predict the bond angle around the
(2)
(c)
(i)
carbon atom. .....................................................................................................
(ii)
oxygen atom bonded to the hydrogen atom. ...................................................
State and explain the relationship between the length and strength of the bonds between
the carbon atom and the two oxygen atoms in methanoic acid.
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(3)
(Total 6 marks)
1
3.
The boiling points of the hydrides of group 6 elements increase in the order
H2S < H2Se < H2Te < H2O.
Explain the trend in the boiling points in terms of bonding.
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(Total 3 marks)
4.
Hydrazoic acid, N3H, can be represented by two possible Lewis structures in which the atoms
can be arranged as NNNH.
(i)
Draw the two possible Lewis structures of N3H.
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(2)
(ii)
Predict the N––N––N and H––N––N bond angles in each case and give your reasoning.
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(6)
2
(iii)
Predict the hybridization of the N atom bonded to the hydrogen atom in each case.
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(2)
(Total 10 marks)
5.
What is the formula of an ionic compound formed by element X (group 2) and element Y
(group 6)?
A.
X3Y
B.
X2Y
C.
XY2
D.
XY
(1)
6.
(i)
Draw Lewis (electron dot) structures for CO2 and H2S showing all valence electrons.
(2)
(ii)
State the shape of each molecule and explain your answer in terms of VSEPR theory.
CO2 .............................................................................................................................
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H2S .............................................................................................................................
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(4)
(iii)
State and explain whether each molecule is polar or non-polar.
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(2)
(Total 8 marks)
3