Water
ICSE · Class 8 · Chemistry
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What is the chemical formula and chemical name of water?
Answer
Water has the molecular formula H₂O. Its chemical name is Dihydrogen oxide. It is a compound made of hydrogen and oxygen.
What is the ratio of hydrogen and oxygen in water by mass and by volume?
Answer
The ratio of hydrogen and oxygen in water is 1 : 8 by mass and 2 : 1 by volume.
Who established that water is a compound of hydrogen and oxygen?
Answer
Henry Cavendish established in 1781 that water is a compound made up of hydrogen and oxygen. Antoine Lavoisier later supported this finding.
What happens when pure water is tested with litmus?
Answer
Pure water is neutral to litmus. It does not change the colour of red or blue litmus.
What is the boiling point and freezing point of pure water at normal pressure?
Answer
Pure water freezes at 0°C and boils at 100°C at normal pressure. The melting point of ice is also 0°C.
Why is water called a universal solvent?
Answer
Water is called a universal solvent because it dissolves almost all kinds of solids, liquids, and gases. It dissolves many substances, though not in the same amount.
Define a solution.
Answer
A solution is a homogeneous mixture of two or more substances whose composition can be varied. Solution = solute + solvent Solute = substance dissolved, smaller quantity Solvent = medium of dissoluti…
What is a solute and what is a solvent?
Answer
A solute is a substance that dissolves in other substances and is present in smaller quantity. A solvent is the medium in which the solute dissolves and is present in larger quantity.
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