evigor of the reactions of lithium, sodium, and potassium with cold water, does

Question

evigor of the reactions of lithium, sodium, and potassium with cold water, does there appear to be a correla reaction tion between the location of these elements in the periodic table and the vigor of In general, oxides of the metallic elements are basic when dissolved in water, whereas oxides of the non-metallic elements behave as acids when dissolved in water. Using the elements you have studied i this experiment, give two examples for metallic oxides and two examples for non-metallic oxides demonstrating this general observation. Use chemical equations to make your point.

Explanation / Answer

Q1

These are alkali metals and belong to group 1 of the periodic table.

All the alkali metals react vigorously with cold water. Hydrogen gas is a byproduct and the metal hydroxide is produced in each metal's reaction with cold water. The speed and violence of the reaction increase as you go down the group.

Q2

The examples of metallic oxides and their reaction with water are :

BaO (s) + H2O(l) ---> Ba 2+(aq) + 2 OH - (aq)

the basic reaction can be generalized as in case of alkali metals

M2O + H2O 2MOH

Nonmetal oxides react with water and form an acidic solution.

CO2 (g) + H2O(l) ---> H2CO3 (aq)

N2O5 + H2O 2HNO3

P4O10 (s) + 6 H2O(l) ---> 4 H3PO4 (aq)

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