Q1
What is hydrogen's key characteristic?
AThe lightest known element
BThe heaviest element
CThe rarest element
DA metal
ICSEClass 9 (ICSE)ChemistryCh 6 · Topic 1
Study of the First Element - Hydrogen
Hydrogen, the first and lightest element, has unique properties and is prepared through specific laboratory methods for various uses.
Core concept
Hydrogen is colourless, odourless, highly flammable, and the lightest known element, existing as a diatomic molecule (H₂).
How it works
In the laboratory, hydrogen is prepared by reacting a metal like zinc with a dilute acid, like hydrochloric acid, releasing hydrogen gas.
Why it matters
Hydrogen gas is tested using the 'pop test' - a burning splint held near hydrogen produces a characteristic popping sound.
Key detail
Hydrogen has various uses, including manufacturing ammonia (for fertilisers), hydrogenating vegetable oils, and as a potential clean fuel.
Exam highlight
Key diagram
Keywords worth remembering
Trending
study of the first element - hydrogenicse class 9
Most searched
ICSE class 9 study of the first element - hydrogen
Quick revision
Study resources
Notes & downloads
Quick notes
• Hydrogen is the lightest element.
• It's colourless, odourless, highly flammable.
• It exists as H2 (diatomic molecule).
• Lab preparation: zinc + dilute acid.
• This releases hydrogen gas.
• The 'pop test' identifies hydrogen gas.
• A burning splint makes a popping sound.
• Uses: ammonia manufacturing, oil hydrogenation, clean fuel.