General Characteristics Of The Compounds Of Alkali Metals
Chapter Name : The S- Block Elements |
Sub Topic Code : 102_11_10_03_01 |
Topic Name : General Characteristics Of The Compounds Of Alkali Metals |
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Sub Topic Name : Oxides And Hydroxides |
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Introduction
• All the common compounds of the alkali metals are generally ionic in nature. • The increasing stability of the peroxide or superoxide, as the size of the metal ion increases, is due to the stabilisation of large anions by larger cations through lattice energy effects. • These oxides are easily hydrolysed by water to form the hydroxides according to the following reactions. • The hydroxides which are obtained by the reaction of the oxides with water are all white crystalline solids. • The alkali metal hydroxides are the strongest of all bases and dissolve freely in water with evolution of much heat on account of intense hydration.
Pre-Requisites:
Atom, compound, element, ionic
Activity:
Nerve impulse conduction, Sodium is a primary ingredient of common salt.
Real Life Question:
What is NaOH, Sodium Hydroxide used for?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Alkali metals | Group 1 elements. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| needle | Prick your finger with a needle lightly. See how the nerve impulse travels through and reaches the brain detecting pain. Sodium calcium and Potassium ions play a major role in nerve impulse conduction. |
Real life uses :
Lye (sodium hydroxide) is used to make soap, detergents.
Places to visit :
Kitchen.
Practical examples around us
| Examples | Explainations |
|---|---|
| Lye | Lye (Sodium hydroxide) is used to make soap. |
What you learn in Theory:
All the common compounds of the alkali metals are generally ionic in nature. The increasing stability of the peroxide or superoxide, as the size of the metal ion increases, is due to the stabilisation of large anions by larger cations through lattice energy effects. These oxides are easily hydrolysed by water to form the hydroxides according to the following reactions. The hydroxides which are obtained by the reaction of the oxides with water are all white crystalline solids. The alkali metal hydroxides are the strongest of all bases and dissolve freely in water with evolution of much heat on account of intense hydration.
What you learn in Practice:
Alkali metal hydroxides and oxides are used in industries to manufacture a number of products.