ch 3 water class 9 icse solutions please
Answers
Answer:
In the free state, water occurs in the solid, liquid and gaseous states.
Solid state: A large amount of fresh water is found in the form of snow or ice.
Liquid state: Most of the water present in oceans and found in streams, rivers, lakes, ponds and springs on land is water in the liquid state.
Gaseous state: Water vapour present in the air is in the gaseous state. Water vapour condenses in the sky to form clouds. Mist and fog are also examples of water in the gaseous form.
Solution 1
In the free state, water occurs in the solid, liquid and gaseous states.
Solid state: A large amount of fresh water is found in the form of snow or ice.
Liquid state: Most of the water present in oceans and found in streams, rivers, lakes, ponds and springs on land is water in the liquid state.
Gaseous state: Water vapour present in the air is in the gaseous state. Water vapour condenses in the sky to form clouds. Mist and fog are also examples of water in the gaseous form.
Solution 2
Water is considered a compound because it is made of two elements hydrogen and oxygen combined in the ratio 1:8 by mass.
Mass ratio of elements H2O
H : O, 2 × 1 : 16 × 1 = 1 : 8
(Atomic mass of H = 1, O = 16)
Components of water cannot be separated by physical methods but can be separated by electrolysis of water.
Solution 3
a) The temperature in Mumbai and Chennai do not fall as low as in Delhi because these cities are situated in the coastal areas. Due to high specific heat capacity, the presence of a large amount of water is able to modify the climate of the nearby land areas making them warmer in winter and cooler in summer. So, the temperature does not fall as low as it does in Delhi.
b) Our body is almost 65% of water, and it has the property of specific heat. Due to high specific heat capacity, the presence of a large amount of water is able to modify the climate of the body and control the temperature of our body, which is warm in winter and cool in summer.
Solution 4
Water dissolves many substances forming an aqueous solution. It can dissolve solids, liquids and gases. When a solid dissolves in water, the solid is the solute, the water is the solvent and the resultant liquid is the solution. So, it is said that water is a universal solvent. In other words, water can dissolve nearly every substance.
Solution 5
The sudden release of the latent heat of condensation causes the violence associated with torrential rain.
Solution 6
Due to the high specific heat capacity, the presence of a large amount of water is able to modify the climate.
The property of anomalous expansion of water enables marine life to exist in the colder regions of the world, because even when water freezes on the top, it is still liquid below the ice layer, as the density of water is greater than that of ice.
The boiling point of water increases due to the presence of dissolved impurities.
The freezing point of water decreases due to the presence of dissolved impurities.
Solution 7
Water has an unusual physical property. When cooled, it first contracts in volume, as do other liquids, but at 4°C (maximum density), it starts expanding, and continues to do so till the temperature reaches 0°C, the point at which it freezes into ice.
Solution 8
Properties of water are different from the properties of elements from which it is formed.
Property
Water
Elements - Oxygen and Hydrogen
Nature
It is a clear, colourless, odourless, tasteless and transparent liquid.
These are colourless, odourless, tasteless and non-poisonous gases.
Solubility
It can dissolve many substances and is called a universal solvent.
Oxygen and hydrogen are slightly soluble in water.
Density
Pure water has maximum density at 4°C.
Oxygen is heavier than air, and hydrogen is the lightest of all the known gases.
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