Properties Of Dihydrogen
Chapter Name : Hydrogen |
Sub Topic Code : 102_11_09_04_01 |
Topic Name : Properties Of Dihydrogen |
|
Sub Topic Name : Physical Properties |
|
Introduction
Hydrogen is the first element in the periodic table and is also the
lightest element known. In the normal elemental form, it exists as a diatomic
molecule.
Pre-Requisites:
Non polar molecules,
isotopes
Activity:
Hydrogen is one of two important elements found in water (H2O).
Each molecule of water is made up of two hydrogen atoms bonded to one oxygen
atom.
Real Life Question:
What
is hydrogen used for..?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Non – polar molecules | A molecule may be nonpolar (when there is an equal sharing of electrons between two different atoms) either because there is (almost) no polarity in the bonds or because of the symmetrical arrangement of polar bonds. |
| Isotopes | Isotopes are variants of a particular chemical element: while all isotopes of a given element share the same number of protons and electrons, each isotope differs from the others in its number of neutrons. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Water, drain clog removal (containing sodium hydroxide) + aluminium foil | When water is added to a drain clog removal liquid in the presence of aluminium ( using aluminium foil) , hydrogen gas is liberated. This is an exothermic reaction. |
Real life uses :
· It is used for the manufacturing of fertilizers.
· It is used in the preparation of vegetable ghee.
It is used as rocket fuel.
Places to visit :
Chemistry lab
Practical examples around us
| Examples | Explainations |
|---|---|
| Hydrogen as a fuel | Hydrogen is commonly used in the petroleum and chemical industries and is also widely used for many physics and engineering applications such as welding or as a coolant. |
What you learn in Theory:
Position of an element in periodic table depends upon its electronic configuration and properties. Hydrogen resembles the elements of group I-A, IV-A and VII-A in some respects.
What you learn in Practice:
• At room temperature hydrogen is a gas.
• It is a colorless, tasteless and odorless gas.
• It is the lightest gas.
• It is insoluble in water.