Last Updated on October 12, 2022 by Chirag Gupta In this post, we will discuss about physical and chemical changes and their characteristics. What is a Physical change? A physical change may be defined as follows: A change in which only the physical properties of the substance get changed, while its chemical composition remain unchanged, […]
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Last Updated on September 14, 2022 by Chirag Gupta In this post we are discussing about solutions, colloids and suspensions for class 9. Solutions A lump of sugar when placed in water disappears and the water becomes sweet. Where is sugar gone? Why does the water taste sweet? The sugar placed in water gets dissolved
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Last Updated on May 4, 2023 by Chirag Gupta In this post, we will discuss about matter and its classification. What is matter? Matter is the material of which the universe is composed. Matter may be defined as something that occupies space, have mass and offers resistance to any force applied on it. For ex:
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Last Updated on June 13, 2024 by Chirag Gupta This post contains Question Answer of chapter Is Matter Around Us Pure including NCERT Exercise. 1. What is meant by a substance? Sol: A substance is a kind of matter that cannot be separated into other kinds of matter by any physical process. 2. List the
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Last Updated on June 13, 2024 by Chirag Gupta This post contains Question Answer of chapter Matter in Our Surroundings including NCERT Exercise. 1. Which of these are matter: Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume? Sol: The following are matter: chair, air, almonds, cold drink, smell of perfume.
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Last Updated on September 16, 2022 by Chirag Gupta Humidity is the amount of water vapour in the air. The humidity of air is defined as the amount of water vapour which is present in one unit volume of the air. It is measured in the units of gram per cubic meter. What is absolute
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Last Updated on September 16, 2022 by Chirag Gupta In this post, we will discuss about evaporation and the factor affecting its rate of evaporation. What is Evaporation? Evaporation is generally defined as a process in which a liquid state changes into vapour state. Evaporation is a form of vaporisation that usually occurs on the
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Last Updated on February 15, 2025 by Chirag Gupta In this post we will discuss about latent heat and its two forms. Let’s start with a question. Why does the temperature remain constant during melting and boiling even when heat is being supplied to a substance continuously? This is so because the heat supplied to
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Last Updated on May 11, 2022 by Chirag Gupta In this article, you will find the answer of the question “can gas be liquefied by increasing pressure?” Liquefaction of gases is the process by which substances in their gaseous state are converted to the liquid state. Different physical states of matter differ in the space
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Last Updated on May 4, 2023 by Chirag Gupta There are three states of matter: Solid state Liquid state Gaseous state What are the properties of solids (First states of matter)? Solids possess the following properties: Solids are rigid and incompressible. Because in solids, the constituent particles are closely packed and there is virtually no
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