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ionic and covalent bonding exam paper q&a's, 2007-2019

Terms in this set (14)

Vice two differences between a sigma and a pi covalent bond
Sigma - formed from the head on overlap of orbitals, involved and type of orbital
Pi - formed from the sideways overlap of p orbitals, does not involve a orbitals
Define electronegativity
Is the relative attraction that an atom in a molecule has for a shared pair of electrons in a covalent bond
Account for the increase in electronegativity values across the second period
Atomic number increasing, atomic radius decreasing
Predict the type of bonding in (OF2)
Slightly polar covalent
State and account for the shape of the (OF2) molecule
V-shaped, 2 lone pairs and 2 bond pairs
Select, giving reasons, which angle is (OF2)
103.0, repulsion between two lone pairs and two bond pairs
What is the valency of carbon in tetrachloromethane
4
Write the oxidation number for oxygen and xenon
Oxygen +2, xenon +4
Use electron pair repulsion theory to predict the shape of a molecule of boron thifluoride
The shape of BF3 is trigonal planar, as the three pairs of electrons are all in the same plane
Mendeleev predicted the properties of the elements Ga and Ge years before they were discovered. Explain the basis for his prediction.
Mendeleev arranged the elements in order of increasing atomic weight and he discovered that every eighth element had similar physical and chemical properties, which he placed in the same vertical column or group
How many sigma bonds and pi bonds, result from the sharing of the valence electrons between the atoms in a molecule of nitrogen
1 sigma 2 pi
Account for the difference in bond angle between the two molecules, 107.3 and 109.5
lone pair of electrons has greater repelling power than a bond pair of electrons
Which of the two substances (NH3) and (SiH4) is more polar
Nh3 more polar, electronegativity difference is greater
Which of the two substances (NH3) and (SiH4) has hydrogen bonding between molecules?
Ammonia, in ammonia hydrogen bonded to a small, highly electronegative element /
when hydrogen bonding occurs hydrogen bonded to nitrogen
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