Concentration

Question 1 What is meant by the concentration of a solution? Question 2 How much water should be added to 15g of salt to obtain 15 per cent salt solution? Question 3 Calculate the concentration of a solution which contains 2.5g of salt dissolved in 50g of water? Question 4 What does a 15% alcohol…

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Separation of mixture

Question 1 What do you mean by separation of mixtures? Question 2 How will you separate a mixture containing sand and sugar? Question 3 Describe a method to separate a mixture of sand and salt? Question 4 How will you separate a mixture of salt and sugar? Question 5 Name a solvent used to separate…

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Physical and chemical change

Question 1  What is a physical change.Give example? Question 2 What is a chemical change.Give example ? Question 3 Give the main differences between physical and chemical change? Physical and Chemical changes Physical changes The changes in which no new substance are formed,are called physical changes. In a physical change,the substances involved do not change their…

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Colloids

Question 1 What are colloids.Give example? Question 2 What do you mean by Tyndall effect? Question 3 Give properties of colloids? Question 4 What are sol.Give example? Question 5 What are aerosol.Give example? Question 6 What are emulsions.Give example? Question 7 What are foam.Give example? Question 8 What is the difference between solution and colloids?…

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Suspension

Question 1 What are suspensions.Give example? Question 2 Give properties of suspension? SUSPENSIONS Those substances which are insoluble in water form suspension. A suspension is a heterogeneous mixture in which small particles of a solid are spread throughout a liquid without dissolving in it. For Ex:Chalk+water,Muddy Water,sand+water,Flour+water etc. Properties 1)It is heterogeneous in nature. 2)The size…

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Solution

Question 1 Define the term solute? Question 2 Define the term solvent?   Question 3 Define the term solution.Give examples? Question 4 Give few properties of solution? Question 5 What is an aqueous solution ? Question 6 What is a non-aqueous solution? Question 7 Give an example of liquid in liquid solution ? Question 8 How will…

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Mixtures

Question 1 What are mixtures.Give example? Question 2 What are homogenous mixture.Give example? Question 3 What are heterogenous mixture.Give example? Question 4 Give few properties of homogenous mixture? Question 5 Give few properties of heterogenous mixture? Question 6 Differentiate between mixtures and compounds ? Question 7 Why air is considered a mixture not a compound ? MIXTURES A…

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Compound

Question 1 What are compounds ?   Question 2 Give few examples of compound?   Question 3 Give few properties of compounds ?   Question 4 What happens when  a mixture of iron filling and sulphur powder is heated ?   Question 5 Why water is a compound and not a mixture?   COMPOUNDS A compound…

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Elements

  Question 1  What is an element.Give few examples?   Question 2 How many elements are known till today? Question 3 Name 2 elements which are liquid at room temperature? Question 4 What are the three groups into which elements can be classified? Question 5 Define the term malleable? Question 6 Define the term ductile? Question…

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Is matter around us pure

Question 1 What are pure substances.Give examples? Question 2 What are the two types of pure substances.Give example of each? Question 3 What are mixtures.Give example? Question 4 What are the characteristics of pure substances? Question 5 What are the characteristics of impure substances? The matter around us is of two types: 1)Pure Substance 2)Mixtures        PURE…

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