Concise Chemistry Class 9 ICSE Solutions for Chapter 3 - Water

ICSE

Concise Chemistry Class 9 ICSE Solutions for Chapter 3 - Water

ICSE Class 9 Chemistry Chapter 3 Selina Concise Solutions - Free PDF Download

Updated ICSE Class 9 Chemistry Chapter 3 - Water Selina Solutions are provided by Vedantu in a step-by-step method. Selina is the most famous publisher of ICSE textbooks. Studying these solutions by Selina Concise Chemistry Class 9 Solutions which are explained and solved by our subject matter experts will help you in preparing for ICSE exams. Concise Chemistry Class 9 ICSE Solutions can be easily downloaded in the given PDF format. These solutions for Class 9 ICSE will help you to score good marks in ICSE Exams 2024-25.

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Water

Water is a very precious resource available on the earth and is indispensable for all living beings present on earth. Water exists in all three states and they are solid, liquid, and gas. Water is usually defined as a compound because water is made up of two elements one is hydrogen and another is oxygen and their ratio is 1:8 by mass.

The atomic mass of both Hydrogens is 1 and the atomic mass of Oxygen is 16.

The components of water cannot be separated through physical change. But it can be separated through a chemical process known as electrolysis and therefore the molecular formula of water is H₂O and its molecular weight is 18.

The use of water is extensive. We use water for different purposes like drinking, cooking, washing clothes, cleaning home and other utensils, and many more activities. Pure water is usually colourless, odourless, and tasteless in nature.

Solution

The solution is defined as a uniform mixture of the solute and solvent. The dissolved substance e.g. sugar, copper sulphate in a solution is called the solute. The substance usually gets dissolved in the solute e.g. water is called the solvent.

The boiling point and freezing point of water change with a change in pressure and by adding solute.

Water contracts when cooled up to 4°C but cooling below this temperature expands. This property provides help in the future especially in the insulation of heat for aquatic animals in polar regions.

The solution is a homogeneous mixture of two or more components whose composition may be gradually changed by changing the relative amount of components. The concentration of a solution is described as mass percent and volume percent. Let's get to know how sugar candy can be made at home? Then boil the sugar solution and keep turning it. and keep turning. The sugar eventually starts bubbling and solidifies. At this time, when the sugar is still in its liquid form, pour it into molds to get the required shape. And your candy is ready.

FAQs on Concise Chemistry Class 9 ICSE Solutions for Chapter 3 - Water

1. Why is water considered a universal solvent?

Water is known as a universal solvent because water dissolves many substances and that leads to the formation of an aqueous solution. It can dissolve all three states: solid, liquid, and gas. When a solid dissolves the solid is considered to be solute, the water is a solvent there and the resultant liquid is considered to be the solution and that is how water is a universal solvent. Just because water is capable of dissolving a variety of substances therefore it is attracted to many of the molecules.

2. The property of water that modifies the climate? When the density of the water varies with climate then what are its consequences?

The high heat capacity of water helps in modifying the climate because of the large amount of water present in it. It can also lead to global warming. The water has many properties and one of its properties is its anomalous expansion which helps the marine life in the sea to exist in the colder regions of the world. Even if the state of water is frozen on the top it is present in the liquid form below it that helps to survive.

3. The properties of water are different from the properties of elements. How?

The difference between the properties of water and the element has been explained in a tabulated form.

Properties of Water
Property	Water	Elements - Oxygen and Hydrogen
Nature	colorless, odorless, tasteless, and transparent liquid.	colorless, odorless, tasteless, and non-poisonous gases.
Solubility	It is a universal solvent because it can dissolve many substances.	In water, oxygen and hydrogen are slightly soluble
Density	Pure water has a maximum density of 4°C.	Oxygen is heavier, and hydrogen is the lightest among all gases.

4. Explain observation and conclusion about the tap water when it is boiled and evaporated?

The observation and conclusion about the tap water when it is boiled and evaporated are as follows:

Observation: When water gets evaporated then there would be a formation of multiple numbers of concentric rings on the water surface.

Conclusion: There is a presence of dissolved salts, minerals, and impurities in the tap water when the tap water boils and it gets evaporated because the heat energy gets transferred to the molecules of water and then starts moving rapidly while boiling.

5. How does air get dissolved in water differently than in air?

Air is dissolved differently in the water as compared to ordinary air and the reason behind is that oxygen is more soluble in water than nitrogen. The percentage of air that gets dissolved in water is higher than air. It is almost 30 to 35 percent of the oxygen that gets dissolved in water whereas only 21 percent of the air gets dissolved in ordinary air and that is how air dissolves differently in water as compared to getting dissolved in ordinary air.