Properties Of Dihydrogen
Chapter Name : Hydrogen |
Sub Topic Code : 102_11_09_04_03 |
Topic Name : Properties Of Dihydrogen |
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Sub Topic Name : Uses Of Dihydrogen |
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Introduction
Hydrogen is important in the proton-proton reaction and carbon-nitrogen cycle. Liquid hydrogen is used in cryogenics and in the study of superconductivity.
Pre-Requisites:
Combustibility, Fuel cells
Activity:
Hydrogen is highly combustible gas and burns in air with a pale blue flame to form water.
Real Life Question:
How is the chemical reactivity of metals linked with their position in the electrochemical series?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Fuel cells | A fuel cell is a device that converts the chemical energy from a fuel into electricity through a chemical reaction with oxygen or another oxidizing agent. |
| Combustibility | Combustibility is a measure of how easily a substance will set on fire, through fire or combustion. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Hydrogen-oxy torch | Atomic hydrogen and oxy-hydrogen torches find use for cutting and welding purposes. |
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:
• The largest single use of dihydrogen is in the synthesis of ammonia which is used in the manufacture of nitric acid and nitrogenous fertilizers.
What you learn in Practice:
• With dinitrogen hydrogen forms ammonia (NH3). • Dihydrogen reacts with strongly electropositive metals like sodium, calcium etc. to form salt like metal hydrides, in which the oxidation state of hydrogen is -1.