Answer key

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Last edited 25 days ago by Learn LoopHQ.

Chapter: 05. Water

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A saturated solution is one in which no more solute can be dissolved at a given temperature.

The continuous movement of water from the earth’s surface as water vapour to the atmosphere and back is called the water cycle.

About 97% of the total water present on earth is in seas and oceans.

Jaundice primarily affects the liver of a person.

Water is a transparent liquid and its chemical formula is H₂O.

Dew are tiny droplets of water formed after the condensation of water vapour in air on cold objects.

The level of groundwater is called the water table.

Rainwater contains dissolved gases like oxygen and carbon dioxide.

Organic farming should be encouraged to reduce water pollution from chemicals.

The solubility of a substance in water generally increases with an increase in temperature.

Water from some wells and springs has minerals with medicinal properties.

Rooftop rainwater harvesting is a method where rainwater is collected on the roof and stored in underground tanks.

Distilled water is obtained by the process of distillation.

The boiling point of pure water is 100°C and freezing point is 0°C.

Water is a universal solvent because a large number of substances dissolve in it.

Oil spill from tankers is one of the major causes of water pollution in seas.

Sterilisation is the process of the removal of germs from water.

Many modern water purifiers are based on the Reverse Osmosis (RO) technique.

Water fit and safe for drinking purpose is called potable water.

Excess rain may cause floods and no rainfall may cause drought.

Rainwater is the purest form of water available on earth.

Water regulates the temperature of our body by sweating/perspiration.

The scientist who proved water is a compound in 1781 was Henry Cavendish.

A solution in which a solute is dissolved in water is called an aqueous solution.

Cholera and diarrhoea are examples of water-borne diseases.

In a water treatment plant, alum is added in the loading tank to settle down suspended impurities faster.

The contamination of water with unwanted substances that makes it unfit for drinking is called water pollution.

About 70% of the human body is water.

The process of removal of dissolved salts from sea/ocean water is called desalination.

World Water Day is celebrated on March 22nd to emphasize the importance of water conservation.

When water is cooled below 4°C, it starts expanding, which is called anomalous expansion.

Two-thirds of the Earth’s surface is covered with water.

A substance that dissolves in other substance to form a solution is called a solute.

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