General Properties Of The Transition Elements
Chapter Name : The D- And F- Block Elements |
Sub Topic Code : 102_12_08_03_05 |
Topic Name : General Properties Of The Transition Elements |
|
Sub Topic Name : Trends In The Standard Electrode Potentials |
|
Introduction
• The unique behaviour of Cu, having a positive
E?, accounts for its inability to liberate H2
from acids.
• Only oxidising acids (nitric and hot
concentrated sulphuric) react with Cu, the acids being reduced.
•
The high energy to transform Cu(s) to Cu2+(aq)
is not balanced by its hydration enthalpy.
• The general trend
towards less negative EV values across the series is related to the general
increase in the sum of the first and second ionisation enthalpies.
•
The highest value for Zn is due to the removal of an
electron from the stable d10 configuration of Zn2+.
•
The comparatively high value for Mn shows that Mn2+(d5)
is particularly stable, whereas comparatively low value for Fe shows the extra
stability of Fe3+ (d5).
•
The
comparatively low value for V is related to the stability of V2+
Pre-Requisites:
Periodic table, elements
Activity:
Various precious metals such as silver, gold and
platinum and industrially important
Real Life Question:
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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 |
|---|---|
| A wire connection in ex. a battery | Observe how the electric potential is generated in a battery. |
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:
• The unique behaviour of Cu, having a positive
E?, accounts for its inability to liberate H2
from acids.
• Only oxidising acids (nitric and hot concentrated
sulphuric) react with Cu, the acids being reduced.
•
The high energy to transform Cu(s) to Cu2+(aq)
is not balanced by its hydration enthalpy.
• The general trend
towards less negative EV values across the series is related to the general
increase in the sum of the first and second ionisation enthalpies.
•
The highest value for Zn is due to the removal of an
electron from the stable d10 configuration of Zn2+.
•
The comparatively high value for Mn shows that Mn2+(d5)
is particularly stable, whereas comparatively low value for Fe shows the extra
stability of Fe3+ (d5).
•
The
comparatively low value for V is related to the stability of V2+
What you learn in Practice:
• The unique behaviour of Cu, having a positive
E?, accounts for its inability to liberate H2
from acids.
• Only oxidising acids (nitric and hot concentrated
sulphuric) react with Cu, the acids being reduced.
•
The high energy to transform Cu(s) to Cu2+(aq)
is not balanced by its hydration enthalpy.
• The general trend
towards less negative EV values across the series is related to the general
increase in the sum of the first and second ionisation enthalpies.
•
The highest value for Zn is due to the removal of an
electron from the stable d10 configuration of Zn2+.
•
The comparatively high value for Mn shows that Mn2+(d5)
is particularly stable, whereas comparatively low value for Fe shows the extra
stability of Fe3+ (d5).
•
The
comparatively low value for V is related to the stability of V2+