Q1
What is water's chemical formula?
AH2O
BH2O2
CHO
DH3O
ICSEClass 9 (ICSE)ChemistryCh 3 · Topic 1
Water
Water, a vital compound (H₂O), has unique properties like high specific heat capacity, and can be tested for purity using specific chemical
Core concept
Water's chemical formula is H₂O, and it's often called the 'universal solvent' due to its ability to dissolve many different substances.
How it works
Hard water contains dissolved calcium and magnesium salts, causing issues like scale formation and reduced soap lathering.
Why it matters
Soft water lacks these dissolved salts, making it more effective for washing and preventing scale buildup in pipes and appliances.
Key detail
Water can be purified through methods like filtration, boiling, and distillation, removing impurities and making it safe for use.
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Quick notes
• Water's formula is H2O.
• It's called the 'universal solvent'.
• Hard water has dissolved calcium and magnesium salts.
• This causes scale formation and less soap lather.
• Soft water lacks these dissolved salts.
• It's better for washing, prevents scale.
• Water purification: filtration, boiling, distillation.
• These remove impurities, making water safe.