{"id":22523,"date":"2022-05-23T09:30:17","date_gmt":"2022-05-23T04:00:17","guid":{"rendered":"https:\/\/cbselibrary.com\/?p=22523"},"modified":"2023-11-10T10:28:29","modified_gmt":"2023-11-10T04:58:29","slug":"selina-concise-chemistry-class-6-icse-solutions-pure-substances-and-mixtures-separation-of-mixtures","status":"publish","type":"post","link":"https:\/\/cbselibrary.com\/selina-concise-chemistry-class-6-icse-solutions-pure-substances-and-mixtures-separation-of-mixtures\/","title":{"rendered":"Selina Concise Chemistry Class 6 ICSE Solutions – Pure Substances and Mixtures ; Separation of Mixtures"},"content":{"rendered":"
ICSE Solutions<\/a>Selina ICSE Solutions<\/a>ML Aggarwal Solutions<\/a><\/p>\n APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 6 Chemistry. You can download the Selina Concise Chemistry ICSE Solutions for Class 6 with Free PDF download option. Selina Publishers Concise Chemistry for Class 6 ICSE Solutions all questions are solved and explained by expert teachers as per ICSE board guidelines.<\/p>\n Selina Class 6 Chemistry ICSE Solutions<\/a>Physics<\/a>Biology<\/a>Maths<\/a>Geography<\/a>History & Civics<\/a><\/p>\n Selina Concise ICSE Solutions for Class 6 Chemistry Chapter 5 Pure Substances and Mixtures ; Separation of Mixtures<\/strong><\/p>\n POINTS TO REMEMBER<\/strong><\/p>\n EXERCISE – I<\/strong><\/span><\/p>\n Question 1.<\/strong><\/span> Question 2.<\/strong><\/span> (a) Pure substance<\/strong> Answer:<\/strong><\/span><\/p>\n (a)\u00a0Pure substance :<\/strong> \u201cPure Substance is either element or compound. It contains the same kind of atom or molecules and has a definite set of physical and chemical properties.\u201d Question 3.<\/strong><\/span> Question 4.<\/strong><\/span> (a)<\/strong> Why do sugar and water retain their individual properties in a sugar solution ? Answer:<\/strong><\/span><\/p>\n (a)<\/strong> As sugar solution is a mixture and mixtures has not any specific set of properties. They show the properties of the individual components from which they are formed. Question 5.<\/strong><\/span> (a) solid-solid<\/strong> Answer:<\/strong><\/span> (b) solid – liquid –<\/strong><\/p>\n (c) liquid – gas –<\/strong><\/p>\n (d) gas – gas –<\/strong><\/p>\n Question 6.<\/strong><\/span> (a)<\/strong> Brass<\/strong> Answer:<\/strong><\/span><\/p>\n (a) Brass<\/strong> \u2192 Copper and Zinc. Question 7.<\/strong><\/span> (a)<\/strong> Three differences between water and air. Answer:<\/strong><\/span> Air :<\/strong><\/p>\n (b)<\/strong> Mixture :<\/strong><\/p>\n EXERCISE – II<\/strong><\/span><\/p>\n Question 1.<\/strong><\/span> (a) Filtration<\/strong> Answer:<\/strong><\/span><\/p>\n (a) Filtration :<\/strong> The process of separating solid particles from liquid by allowing it to pass through a filter paper is called filtration. Question 2.<\/strong><\/span> Question 3.<\/strong><\/span> (a)<\/strong> Solid-solid heterogeneous mixture Answer:<\/strong><\/span><\/p>\n (a)<\/strong> Iron and sulphur. Question 4.<\/strong><\/span> (a)<\/strong> Powdered glass and sugar Answer:<\/strong><\/span><\/p>\n (a) FILTRATION :<\/strong> Glass and sugar on dissolving in water and filtering, glass separates out as residue on the filter paper. Filtrate of sugar solution is heated to remove water by evaporation, sugar is collected as crystals. Question 5.<\/strong><\/span> (a)<\/strong> two substances which can sublime Answer:<\/strong><\/span><\/p>\n (a)<\/strong> Camphor and Naphthalene Question 6.<\/strong><\/span> (a)<\/strong> Sand and saw dust cannot be separated by hand picking. Answer:<\/strong><\/span><\/p>\n\n
\nSelect homogeneous and heterogeneous mixtures from the following:
\nSalt solution, petrol and water, sand and charcoal, alcohol and water, air dissolved in water, air, sea water, fruit juices, mist, brass.
\nAnswer:<\/strong><\/span>
\nHomogeneous mixture :<\/strong> Salt solution, alcohol and water, air dissolved in water, sea water, brass.
\nHeterogeneous mixture:<\/strong> Sand and charcoal, air, fruit juice, mist, petrol and water.<\/p>\n
\nDefine the following :<\/strong><\/p>\n
\n (b) Impure substance<\/strong>
\n (c) Alloy<\/strong>
\n (d) Solution<\/strong>
\n (e) Heterogeneous mixture<\/strong>
\n (f) Homogeneous mixture<\/strong><\/p>\n
\n(b)<\/strong> Impure substance :<\/strong> \u201cA substance in which some other substances are also present in smaller or larger amounts is called an impure substance. Mixtures are impure substance.
\nExample of impure substance is air.
\n(c) Alloy :<\/strong> \u201cA homogeneous solid mixture of two or more metals or a metal and a non-metal is called an alloy.\u201d
\n(d) Solution :<\/strong> \u201cThe homogeneous mixture of water (or any other solvent) and a substance soluble in it is called a solution.\u201d
\n(e) Heterogeneous mixture :<\/strong> \u201cA mixture in which the components are not uniformally distributed through its volume and can be easily seen separately is called heterogeneous mixture.\u201d
\n(f) Homogeneous mixture :<\/strong> \u201cA mixture in which its constituents are uniformly distributed throughout its volume and cannot be seen separately is called a homogenous mixture.\u201d<\/p>\n
\nList four characteristics of a mixture.
\nAnswer:<\/strong><\/span>
\nFour characteristics of a mixture :<\/strong><\/p>\n\n
\nGive reasons :<\/strong><\/p>\n
\n(b)<\/strong> Why do petrol and water form a heterogeneous mixture ?
\n(c)<\/strong> Why sulphur does dissolve when carbon disulphide is added to a mixture of iron and sulphur but not when it is added to iron sulphide ?<\/p>\n
\n(b)<\/strong> Petrol and water forms a heterogeneous mixture as its constituents can be seen separately and are not uniformly distributed throughout its volume.
\n(c)<\/strong> Sulphur has the property to dissolve in carbon disulphide whereas iron does not dissolve and retains its individual property. However, On heating Iron and Sulphur, they chemically combined forming Iron Sulphide. In this, Iron and Sulphur particles do not exists separately as such they loose their individual property.<\/p>\n
\nGive two examples for each of the following types of mixture.<\/p>\n
\n(b) solid-liquid<\/strong>
\n(c) liquid-gas<\/strong>
\n(d) gas-gas<\/strong><\/p>\n
\nTwo examples of :<\/strong>
\n(a) solid – solid<\/strong> –<\/strong><\/p>\n\n
\n
\n
\n
\nName the components present in the following mixtures:<\/p>\n
\n(b)<\/strong> Duralumin<\/strong>
\n(c)<\/strong> Tap water<\/strong>
\n(d) Bronze<\/strong>
\n(e) Crude petroleum oil .<\/strong><\/p>\n
\n(b) Duralumin<\/strong> \u2192\u00a0Aluminium + Copper with little manganese and magnesium.
\n(c) Tap water<\/strong> \u2192 air, dissolved salts.
\n(d) Bronze<\/strong> \u2192 Copper, Tin and zinc.
\n(e) Crude petroleum oil<\/strong> \u2192 petrol, kerosene, diesel, LPG, mixed with salt, water and earth particles.<\/p>\n
\nState:<\/strong><\/p>\n
\n(b)<\/strong> Four differences between compounds and mixtures.<\/p>\n
\n(a)<\/strong>
\nWater :<\/strong><\/p>\n\n
\n
\n Compound :<\/strong><\/p>\n\n
\n
\nDefine:<\/strong><\/p>\n
\n (b) Sublimation<\/strong>
\n (c) Evaporation<\/strong>
\n (d) Crystallisation<\/strong>
\n (e) Miscible liquids<\/strong>
\n (f) Immiscible liquids<\/strong><\/p>\n
\n(b) Sublimation :<\/strong> The process in which a solid changes directly into its vapours on heating is called sublimation.
\n(c) Evaporation :<\/strong> Is the process of converting a liquid into its vapours state either by exposing it to air or by heating.
\n(d) Crystallisation :<\/strong> Evaporation of liquid from a homogeneous liquit-solid mixture and collecting solid in the form of crystals is called
\ncrystallisation.
\n(e) Miscible liquids:<\/strong> Homogeneous liquid-liquid mixtures are called miscible liquids.
\n(f) Immiscible liquids :<\/strong> Heterogeneous liquid-liquid mixtures are called immiscible liquids.<\/p>\n
\nWhy do we need pure substances?
\nAnswer:<\/strong><\/span>
\nWe need pure substances because of the following reasons:<\/p>\n\n
\nGive one example for each of the following types of mixtures.<\/p>\n
\n(b)<\/strong> Solid-liquid heterogenous mixture
\n(c)<\/strong> Solid-liquid homogeneous mixture<\/p>\n
\n(b)<\/strong> Sand and water, rice and water.
\n(c)<\/strong> Sugar from its solution in water.<\/p>\n
\nName the process by which the components of following mixtures can be separated.<\/p>\n
\n(b)<\/strong> Chalk powder and iron filings
\n(c)<\/strong> Chaff and grain
\n(d)<\/strong> Salt and water
\n(e)<\/strong> Wheat and sugar
\n(f)<\/strong> Sand and camphor
\n(g)<\/strong> Sugar and water<\/p>\n
\n(b) MAGNETIC SEPERATION :<\/strong> With the help of a magnet, iron filings can be separated leaving behind chalk powder.
\n(c) WINNOWING :<\/strong> It separates chaff (lighter) from heavier grains in two different heaps.
\n(d) EVAPORATION :<\/strong> This method is used to separate the components of a homogeneous solid-liquid mixture, like salt from sea water. Sea water is collected in shallow beds and allowed to evaporate in the sun. When all the water is evaporated, salt is left behind.
\n(e) EVAPORATION :<\/strong> Wheat and sugar are put in water in a beaker. Sugar dissolves and mixture is passed through strainer and separated and dried. Sugar is obtained by evaporating sugar solution.
\n(f) SUBLIMATION :<\/strong> Camphor sublimes on heating leaving behind sand.
\n(g) CRYSTALLISATION :<\/strong> Pure sugar is obtained from its solution in water by the process of crystallisation. At first the sugar solution is heated to evaporate Water at a faster speed. When very less of water is left the solution is cooled. On cooling sugar dissolved in it starts separating out in the form of crystals.<\/p>\n
\nName:<\/strong><\/p>\n
\n(b)<\/strong> two substances soluble in water
\n(c)<\/strong> two substances insoluble in water
\n(d)<\/strong> four substances that can be used as filters.<\/p>\n
\n(b)<\/strong> Sugar and salt (NaCl)
\n(c)<\/strong> Sand and chalk powder.
\n(d) (i)<\/strong> Filter paper,\u00a0(ii)<\/strong> A bead of sand,\u00a0(iii)<\/strong> Charcoal,\u00a0(iv)<\/strong> A piece of muslin cloth.<\/p>\n
\nGive reasons :<\/strong><\/p>\n
\n(b)<\/strong> Magnet is used to separate a mixture of iron and sulphur.
\n(c)<\/strong> Alum is used in purification of river water.<\/p>\n