Question

Questions: 1. Compare the burning of each element in air and in the oxygen bottle. 4. Does ferric oxide appear to be soluble in water? Relate this observation with the acid/hase test. 5. What type of elements form oxides that produce acidic solutions? What type of elements form oxides that produce basic properties? Is there any relationship between acidic or basic properties of the oxides and the position of the element in the periodic table? 6. Explain whether we would have a different result, if we had burned the calcium instead of adding it directly to the water inside the oxygen bottle. 7. If we think of the reaction of a Group I metal with oxygen as involving transfer of electrons from the metal atom to an oxygen molecule, what would happen if the addition of electrons to the oxygen molecule occurred in a step-by-step fashion? Each of the ions named below is known to exist. What would be the formulas for the resulting compounds if these ions were combined with sodium ions (Na+)? O2(g) + O2 O2 (g) + 2ē - 0,2- O2(g) + 4e-20, 2- (superoxide ion) (peroxide ion) (two oxide ion) Page 134

Answer 1

1) When Metals react in air , metallic oxide and metallic nitride are formed.

2 Mg + O2 ------> 2 MgO

3 Mg + N2 --------> Mg3 N2

When non metals react in air, only oxides are formed but not nitrides.

S + O2 -------> SO2

P4 + 5O2 -----> P4O10

2) Ferric oxide is insoluble in water.

Ferric oxide is basic oxide so it reacts with acids

Fe2O3 + 6 HCl ------->. 2 FeCl3 + 3 H2O

3) Non- metallic oxides dissolve in water to form acidic solution

SO2 + H2O ------> H2SO3 ( Sulphurous acid )

Metallic oxides dissolve in water to form basic solution

MgO + H2O -------> Mg (OH )2 ( Magnesium hydroxide )

Metals are present in S- block ( left side of the periodic table ) and d- block ( middle of the periodic table )

Non - metals are present in P- block ( right side of the periodic table )

4) In the presence of H2O and O2 burning of Ca will give Ca(OH)2

Ca + H2O + O2 ---------> Ca( OH )2 ( base )

5) Sodium superoxide - NaO2

Sodium peroxide ---Na2 O2

Sodium monoxide --Na2O