Is matter pure around us. ppt made by radhika

this is a power point presentation told to know more things,visualize the particles around you. how are the substance formed,etc.

1. Is Matter Around Us Pure Introduction Pure and impure substances Mixture and its types Solutions, suspensions and colloids Depuration of mixture

2. Pure substances: A pure substance is one which is made up of only one kind of particles. These may be atoms or molecules and can’t be separated by any physical method for example water, sulphur, hydrogen, carbon etc. are know as pure substances because they are made up of only one kind of particles. A pure substance has a fixed composition as well as a fixed melting point and boiling point.

3. Impure Substances: An impure substances is that which made by two or more than two different kinds of particle (atoms or molecules) and can be separated by physical method. All the mixtures are impure substances. Some of the examples of the mixtures are: salt solution, sugar solution, milk, sea-water, air, sugarcane juice, soft drinks, sharbat, rocks, minerals, petroleum, LPG, biogas, tap water, tea, coffee, paint, wood, soil and bricks. A mixture may be homogeneous or heterogeneous. A mixture does not have a fixed composition or a fixed melting point and boiling point.

4. Classify the following

5. Classification

6. Classify the following into pure and mixture

7. Classify the following into element, compounds and mixture : Sodium, Soil, Sugar solution, Silver, Calcium carbonate, tin Silicon, Coal, Air, Soap, Methane, Carbon Dioxide, Blood.

8. Ans : a. Elements: Sodium, Silver, Tin, Silicon b . Compounds: Calcium carbonate, Soap, Methane, Carbon dioxide. c . Mixtures: Soil, Sugar Solution, Coal, Air, Blood.

9. Solution

10. Solubility of a solute: “ The maximum amount of solute which can be dissolved is 100 gm of the solvent of form a saturated solution at a given temperature is known as a solubility of a solute.”

11. Concentration of solution Concentration=

12. A solution contains 30 g of sugar dissolved in 370 g of water. Calculate the concentration of this solution

13. Solution : We know that concentration of solution Here, Mass of solute (sugar) = 30 g and , Mass of Solvent (water) = 370 g So, Mass of solution = Mass of solute + Mass of solvent = 30 + 370 = 400g Now, putting the values of ‘mass of solute’ and ‘mass of solution’ in the above formula, we get : C=30/400 Concentration of solution = = 7.5 percent

14. If 110 g of salt is present in 550 g of solution, calculate the concentration of solution. Problem 2

15. Concentration:

16. Solution Here, Mass of solute (salt) = 110 g and, Mass of solution = 550 g Now, we know that; concentration of solution percent (or 20%)

17. Problem:3 If 2 mL of acetone is present in 45 mL of its aqueous solution calculate the concentration of this solution.

18. Percentage Concentration

19. Find Concentration of solution if 36 g salt dissolved in 100 ml of solvent