Is matter around us pure

Concentration

Last Updated on March 20, 2019 By Mrs Shilpi Nagpal 3 Comments

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 solution means? Question 5 If 25mL of acetone is present in 150ml of … [Read more...] about Concentration

Separation of Mixture

Last Updated on September 28, 2019 By Mrs Shilpi Nagpal 6 Comments

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 a mixture of sulphur and carbon? Question 6 How will you separate … [Read more...] about Separation of Mixture

Physical and chemical change

Last Updated on March 20, 2019 By Mrs Shilpi Nagpal 2 Comments

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 … [Read more...] about Physical and chemical change

Colloids

Last Updated on May 3, 2020 By Mrs Shilpi Nagpal Leave a Comment

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 … [Read more...] about Colloids

Suspension

Last Updated on March 20, 2019 By Mrs Shilpi Nagpal Leave a Comment

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 … [Read more...] about Suspension