(a)
Interpretation:
The formula of the oxide that in its highest oxidation state should be written.
Concept introduction:
Oxygen has six valence electrons in its valence shell, therefore, oxygen can achieve an octet by accepting two electrons from an active metal or by sharing two additional electrons through covalent bonding.
When oxygen reacts with active metals, it gives ionic oxides. With nonmetals, oxygen forms covalent oxides.
All the oxygen in oxides are in
(b)
Interpretation:
Each oxide should be classified as basic, acidic or amphoteric.
Concept introduction:
Oxides can be categorized as basic, acidic or amphoteric. Basic oxides are ionic and are formed by metals on the left side of the periodic table. Acidic oxides are covalent and are formed by nonmetals on the right side of the periodic table. Amphoteric oxides can react with both acids and bases.
(c)
Interpretation:
Which oxide is the most ionic and which oxide is the most covalent should be discussed.
Concept introduction:
When electronegativity difference between atoms in a bond is larger than two units, that bond is said to be ionic and when the difference is less than two, it is said to be a covalent bond.
(d)
Interpretation:
Which oxides are molecular and which are solids with an infinitely extended three-dimensional crystal structure should be determined.
Concept introduction:
Oxygen has six valence electrons in its valence shell, therefore, oxygen can achieve an octet by accepting two electrons from an active metal or by sharing two additional electrons through covalent bonding.
When oxygen reacts with active metals, it gives ionic oxides. With nonmetals, oxygen forms covalent oxides.
(e)
Interpretation:
Which oxide has the highest melting point and which has the lowest melting point should be determined.
Concept introduction:
Most of ionic oxides form crystal lattice structures. Lattice energies are very high, so, the bonds between atoms are difficult to break. So, ionic oxides have higher melting points. Most first row and second row nonmetal oxides have lower melting points, so, most of them exists as gas or liquid at room temperature.
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CHEMISTRY-MASTERINGCHEMISTRY W/ETEXT
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