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00:00 - Introduction 02:05 - Matter 06:10 - Pure substance 13:49 - Elements 21:47 - Metals,Non-metals and Metalloids 28:24 - Compounds 36:54 - Homogeneous and Heterogenous Mixture 45:48 - Mixture and Compounds 49:49 - What is a Solution? 52:27 - Alloys 56:09 - Solution,Suspension and colloids 1:09:38 - Concentration of a solution 1:13:47 - Saturated and Unsaturated solution 1:22:35 - Solubility 1:24:26 - Physical and Chemical changes 1:33:24 - Questions practice

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𝐓𝐞𝐫𝐦𝐬:- i. Pure substance :- Pure substances are the substances which are made up of only one kind of particles. ex: Oxygen, water. Characteristics of pure substances:- i. Pure substances are homogeneous in nature. ii. Pure substances have fixed set of properties. iii. Pure substances cannot be separated into other kinds of matter by physical process. Elements :- Elements are the pure substances which cannot be broken down into simpler substances by any physical or chemical process as they are made up of only one kind of particle. e.x - oxygen, nitrogen etc. Metals, Non metals, mtellaloids: Boron, arsenic, antimony, silicon, germanium... Have Properties intermediate between metal and non metals. Compound - Compound are the pure substances which are made up of 2 Or more elements chemically combined together in a fixed proportion by mass. e.x - CO2 , H2O etc. Characteristics of compound:- i. Elements in compound are chemically combined together in a fixed proportion. ii. The properties of compound are very different from it's constituent elements. iii. Compound has fixed melting and boiling point. iv. Constituent elements which made up the compound can be separated by chemical processes. ex water by electrolysis. v. Compounds are homogeneous in nature. Mixture:- Mixture is an impure substances which consist of 2 or more elements or compounds not chemically combined together.e.x Tea, Air, milk etc There are two types of mixture :- i. Homogeneous mixture ii. Heterogeneous mixture 1•) Homogeneous mixtures: Those mixtures in which substances are completely mixed together and are indistinguishable form one another are called homogeneous mixtures. It has uniform composition. It has no boundary of separation between the various constituent.

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0:0 introduction 02:05 matter 06:10 pure substance 13:49 elements 21:47 metal non metals metalloid 28:24 compound 36: 45 homogeneous and heterogeneous 45:48 mixture and compound 49:49 solutions 52 :27 alloys 56:09 solutions suspension and colloids 1:09:38 concentration of a solution 1:13:47 saturated and unsaturated solution 1:22:35 solubility 1:24:26 physical and chemical changes 1:33:24 question practice 1:49:11 thank you bachoon!

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44:17 DOUBT QUESTION In our previous discussion about matter, we learned that matter is composed of particles. When a substance, like sugar, is dissolved in another substance, such as water, the sugar particles separate and spread among the water molecules. In this chapter, we are studying the chemical properties of matter. You have explained that mixtures are substances made up of two or more elements and compounds that are not physically combined. You have also explained that homogeneous mixtures are those mixtures in which substances are mixed and are indistinguishable from one another. An example of a homogeneous mixture is tea, which is made up of various constituents (like tea leaves, sugar, milk, ginger, and some other ingredients). So, can we say that the tea constituents have separated into intermolecular spaces between the water molecules? When preparing tea, heat is absorbed or released, but a mixture doesn't require any heat for its formation. Since a homogeneous mixture is also a type of mixture, why are we considering a homogeneous mixture as a mixture?

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⏳ TimeStamps - 00:00 - Introduction 02:05 - Matter 06:10 - Pure substance 13:49 - Elements 21:47 - Metals,Non-metals and Metalloids 28:24 - Compounds 36:54 - Homogeneous and Heterogenous Mixture 45:48 - Mixture and Compounds 49:49 - What is a Solution? 52:27 - Alloys 56:09 - Solution,Suspension and colloids 1:09:38 - Concentration of a solution 1:13:47 - Saturated and Unsaturated solution 1:22:35 - Solubility 1:24:26 - Physical and Chemical changes 1:33:24 - Questions practice 1:49:10 - Thank You Bacchon! plz like kar do yaar

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44:17 TEA [Homogeneous Mixture] The resulting mixture looks uniform because the dispersed particles or molecules are too small to be seen individually. There are no visible layers or separate phases.When you taste the tea, the uniform distribution of the components means that each sip contains the same proportions of water, milk, tea compounds, and sugar. This is why it tastes the same throughout.

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44:58 tea/coffee- homogeneous milk+cornflakes- heterogeneous

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The April Theses were a series of ten directives issued by Lenin upon his return to Russia in April 1917 from his exile in Switzerland. These theses outlined Lenin's vision for the future of Russia and the Bolshevik Party. Key points from the April Theses included: * End of the war: Lenin called for an immediate end to Russia's involvement in World War I. * Transfer of land: He proposed that land be transferred to the peasants. * Nationalization of banks: Lenin advocated for the nationalization of banks. * Soviet power: He argued that power should be transferred to the Soviets, councils of workers and soldiers. * Communist Party: Lenin suggested that the Bolshevik Party should rename itself the Communist Party to reflect its radical aims. The April Theses were a significant turning point in Russian history, as they provided a clear and concise plan for the Bolsheviks to seize power and transform Russia into a socialist state.

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Question practice 1:34:27 1. Ans: C ( Q = Non Metals, R=Metal,S=Metalloids)

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1:34:46 1. option (C) 1:36:25 2.option(B)

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The video script covers the concept of solutions, suspensions, and colloids, as well as the properties of matter and chemical changes. It explains the difference between homogeneous and heterogeneous mixtures, solubility, the Tyndall effect, and the classification of pure substances into elements and compounds. It also discusses the properties of metals and non-metals, and the importance of understanding chemical properties. Understanding Pure Substances and Chemical Properties Pure substances are made up of only one kind of particle. Chemical properties are based on the composition of pure substances. Understanding the concept of pure substances and their classification based on chemical properties. Understanding Pure Substances and Elements Pure substances are made up of only one kind of particles Pure substances can be classified into elements and compounds Water is a pure substance and can be broken down into simpler substances through chemical processes Understanding Elements, Compounds, and Metals in Chemistry Water is not an element, it's a compound. Water is made of hydrogen and oxygen particles. Metals are good conductors of heat and electricity, and have a shiny appearance. Understanding Compounds and Chemical Combinations Jewelry made of metals and non-metals needs to have a shiny appearance from a distance. Metals and non-metals have different properties, such as luster and sonorousness. Compounds are substances made up of two or more elements chemically combined in a fixed proportion by mass. Understanding Compounds and Mixtures in Chemistry Water is a compound made of hydrogen and oxygen in a 1:8 ratio. Compounds can be separated into their constituents by chemical processes. Homogeneous mixtures have uniform composition, while heterogeneous mixtures do not. Understanding Homogeneous and Heterogeneous Mixtures Homogeneous mixtures have uniform composition and cannot be distinguished visually. Heterogeneous mixtures have visible boundaries and can be visually distinguished. Understanding the concept of homogeneous and heterogeneous mixtures is crucial for chemistry. Understanding Solutions, Suspensions, and Colloids in Chemistry Salt solution is made by dissolving solid salt in water. Children often misunderstand the concept of solutions, suspensions, and colloids. Solutions are made by dissolving a solid or liquid in a liquid. Understanding Colloids, Suspensions, and Tindal Effect Colloids and suspensions have different particle sizes, affecting their ability to scatter light. The Tindal effect occurs when light is scattered by suspended particles, making the light's path visible. The size of particles in a solution determines whether the Tindal effect will be visible. Understanding Concentration of Solutions and Saturated vs. Unsaturated Solutions Scattering light can make the path of light visible, known as the Tyndall effect. Tyndall effect is observed when sunlight passes through a dense forest with mist containing tiny water droplets. Concentration of solutions can be determined using the mass by mass percentage formula. Understanding the Effect of Temperature on Solubility Adding salt to water at different temperatures affects solubility. Increasing temperature increases solubility, while decreasing temperature decreases solubility. Solubility is the maximum amount of solute that can be dissolved in a solvent at a specific temperature. Understanding Physical and Chemical Changes At a specific temperature, the solubility of a substance in a solvent determines the maximum solute that can dissolve. Physical changes involve alterations in the size, shape, or state of a substance, while chemical changes result in the formation of new substances. Burning of a candle involves both physical (melting of wax) and chemical (formation of carbon dioxide, water, and vapor) changes. Understanding Chemical Changes and Solutions Chemical changes involve the burning of substances and the physical change from solid to liquid. Applying concepts of solutions and identifying properties of substances based on their behavior. Calculating the mass of solutions required to make a specific concentration of a substance. Understanding Solutions and Solvents in Chemistry Glucose is a plus mass of solvent, which is water. The solution is 150 grams, and the solvent is water. The mass of solution plus mass of solvent equals the total mass of the solution. Understanding the Chapter Concepts Chapter was about Matter Rounds Pure Story was basically about Matter Matter is now moving towards Chapter Three and Four

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1:37:49 Ans: B( A is suspension B and D are colloids Cis a solution)

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Tea/coffee is homogeneous Cornflakes is heterogeneous 44.50

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we can see that most of the matter around us exist as mixtures of two or more pure components, for example, sea water, minerals, soil etc.

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