Q1
What is hydrogen's key characteristic?
ALightest and most abundant element
BHeaviest element
CRarest element
DA metal
ICSEClass 8 (ICSE)ScienceCh 15 · Topic 2
Practice and Revision - Hydrogen
Let us practise and revise what we learned about hydrogen. Hydrogen is the lightest and most abundant element in the universe, with unique p
Core concept
Hydrogen is colourless, odourless, and highly flammable, existing as a diatomic molecule (H₂) under normal conditions.
How it works
Hydrogen can be prepared in labs by reacting metals like zinc with dilute acids, releasing hydrogen gas.
Why it matters
Hydrogen is used in various applications, like manufacturing ammonia, hydrogenating oils, and as a potential clean fuel source.
Key detail
Understanding hydrogen's properties and uses is important given its potential role in future clean energy technologies.
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Quick notes
• Hydrogen is the lightest, most abundant element.
• It's colourless, odourless and highly flammable.
• It exists as H2 (diatomic molecule).
• It's prepared by reacting metals with acids.
• Zinc with dilute acid releases hydrogen gas.
• Hydrogen is used in ammonia manufacturing.
• It's used in oil hydrogenation.
• It's a potential clean fuel source.