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 point of difference between homogeneous and heterogeneous mixtures. Sol:
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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. 2. Give reasons for the following observation: The smell
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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 humidity? The maximum limit of the water vapour which
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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 surface of liquids and involves the change of the
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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 the substance is used up in overcoming the intermolecular
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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 in between their particles. The gaseous state has very
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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 space between the particles. So, solids cannot be compressed.
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What makes the matter to exist in any one of three state of matter? Why should the properties of solids, liquids and gases be different? Before finding a solution for the above mentioned questions, let us recollect that: All matter is made up of very small particles. These particles may be atoms, ions or molecules.
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We are given with, Molarity = 0.001 M Volume = 100 ml = 0.1 L Number of moles of H2SO4 = Molarity*Volume = 0.001 M*0.1 L = 0.0001 mole Dissociation of sulphuric acid occurs as: H2SO4 ⟶ 2H+ + SO42- From the above equation, 1 molecule H2SO4 given 1 SO42- ion then,
Calculate the number of sulphate ions in 100 ml of 0.001 M H2SO4 solution. Read More »
Given mass of CO2 = 200 mg = 0.2 g Molar mass of CO2 = 44 g/mol Number of moles of 200 mg CO2 = Given mass/Molar mass of CO2 = 0.2 g/44 g mol-1 = 0.00454 mole Number of molecules of CO2 removed = 1021 Number of moles of CO2 removed = 1021/(6.022*1023) =
From 200 mg of CO2, 10^21 molecules are removed. How many moles of CO2 are left? Read More »
