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 2
Practice and Revision - Study of the First Element - Hydrogen
Let us practise and revise what we learned about study of the first element - hydrogen. Hydrogen, the first and lightest element, has unique
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.
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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.