(a)
Explain what is meant by the term electronegativity, and how it relates to the concept of bond polarity.
[ 2 ]
A-Level CAIE Chemistry AS 3.1 Electronegativity and bonding Question Bank
[Maximum number: 2]
The element magnesium, Mg, proton number 12, is a metal which is used in many alloys which are strong and light.
Magnesium has several naturally occurring isotopes.
(a)
The chloride A melts at while magnesium chloride melts at .
[ 2 ]
(i)
Suggest what type of bonding is present in A.
[ 2 ]
(a)
Sodium and silicon also react directly with chlorine to produce the chlorides shown.
[ 4 ]
(i)
Explain the differences between the melting points of these two chlorides in terms of their structure and bonding. You should refer to the difference between the electronegativities of the elements in your answer.
NaCl structure and bonding
structure and bonding
explanation
[ 4 ]
(a)
One of the factors that determines the type of bonding present between the particles of a substance is the relative electronegativities of the bonded particles.
[ 2 ]
(i)
Explain the meaning of the term electronegativity.
[ 2 ]
[Maximum number: 3]
The Pauling electronegativity values of elements can be used to predict the chemical properties of compounds.
Use the information in Table 1.1 to answer the following questions.
Table 1.1
(a)
(i)
Define electronegativity.
[ 1 ]
(ii)
O and S are in Group 16 .
Explain the difference in the Pauling electronegativity values of O and S .
[ 2 ]
[Maximum number: 3]
The melting points of some solids are shown in Table 1.1.
Table 1.1
(a)
(i)
Define electronegativity.
[ 1 ]
(ii)
Explain why electronegativity increases across a period.
[ 2 ]
[Maximum number: 1]
The ability of an atom in a covalent bond to attract electrons to itself is called its electronegativity.
The greater the difference between the electronegativities of the two atoms in the bond, the more polar is the bond.
Which pair will form the most polar covalent bond between the atoms?
A
chlorine and bromine
B
chlorine and iodine
C
fluorine and chlorine
D
fluorine and iodine
[Maximum number: 1]
L and M are elements in Period 3 of the Periodic Table. Neither element is argon. Information about the Pauling electronegativity values of L and M is given.
Three statements about elements L and M are given.
1 Element L contains covalent bonds.
2 Element L has a higher atomic number than element M .
3 A compound of L and M contains ionic bonds.
Which statements are correct?
A
1, 2 and 3
B
1 and 2 only
C
1 and 3 only
D
2 and 3 only
[Maximum number: 1]
Which compound has the smallest difference in electronegativity between its two elements?
A
KF
B
KBr
C
LiF
D
LiBr
[Maximum number: 1]
Carbon and silicon have the same outer electronic structure.
Why is a Si-Si bond weaker than a C-C bond?
A
Silicon atoms have a larger atomic radius than carbon atoms.
B
Silicon has a greater nuclear charge than carbon.
C
Silicon has a smaller first ionisation energy than carbon.
D
Silicon is more metallic than carbon.