General Properties Of The Transition Elements
Chapter Name : The D- And F- Block Elements |
Sub Topic Code : 102_12_08_03_07 |
Topic Name : General Properties Of The Transition Elements |
|
Sub Topic Name : Chemical Reactivity And E Values |
|
Introduction
• Transition metals vary widely in their
chemical reactivity.
• Many of them are sufficiently electropositive
to dissolve in mineral acids, although a few are ‘noble’—that is, they are
unaffected by single acids.
•
The metals of the first series with the exception of
copper are relatively more reactive and are oxidised by 1M H+.
•
For example, titanium and vanadium, in practice, are
passive to dilute non oxidising acids at room temperature
The E ? values for M2+/M
indicate a decreasing tendency to form divalent cations across the series. This
general trend towards less negative E? values is related to
the increase in the sum of the first and second ionisation enthalpies.
Pre-Requisites:
Periodic table, elements
Activity:
Various precious metals such as silver, gold and
platinum and industrially important
Real Life Question:
null
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Group | Group is the vertical column on the periodic table which contains elements having the similar properties |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Dissolve salt in water | Salt dissolves in water as it chemically react with it |
Real life uses :
To make jewellery, utensils
Places to visit :
Bank, jewellery shop
Practical examples around us
| Examples | Explainations |
|---|---|
| Gold coins | • Various precious metals such as silver, gold and platinum and industrially important |
What you learn in Theory:
• Transition metals vary widely in their
chemical reactivity.
• Many of them are sufficiently electropositive
to dissolve in mineral acids, although a few are ‘noble’—that is, they are
unaffected by single acids.
•
The metals of the first series with the exception of
copper are relatively more reactive and are oxidised by 1M H+.
•
For example, titanium and vanadium, in practice, are
passive to dilute non oxidising acids at room temperature
The E ? values for M2+/M
indicate a decreasing tendency to form divalent cations across the series. This
general trend towards less negative E? values is related to
the increase in the sum of the first and second ionisation enthalpies.
What you learn in Practice:
• Transition metals vary widely in their
chemical reactivity.
• Many of them are sufficiently electropositive
to dissolve in mineral acids, although a few are ‘noble’—that is, they are
unaffected by single acids.
•
The metals of the first series with the exception of
copper are relatively more reactive and are oxidised by 1M H+.
•
For example, titanium and vanadium, in practice, are
passive to dilute non oxidising acids at room temperature
The E ? values for M2+/M
indicate a decreasing tendency to form divalent cations across the series. This
general trend towards less negative E? values is related to
the increase in the sum of the first and second ionisation enthalpies.