Sorting Material into Groups

1. Why Sort? Sorting helps us organize and categorize materials based on their similarities and differences. This makes it easier to identify, locate, and study them. Classification Methods: States of Matter: Materials can be categorized into solids, liquids, and gases based on their physical state at room temperature. Physical Properties: Further classification can be done based on other properties like texture, size, shape, shine (lustre), transparency, solubility in water, and hardness. Examples: Metals are generally shiny, hard, and conductors of heat and electricity. Non-metals can be shiny or dull, brittle or flexible, and insulators or conductors. Additional Points: Mixing different materials can lead to new combinations with new properties, sometimes creating solutions or alloys.

2. Sorting and classification are important not only in science but also in everyday life, helping us organize our belongings, information, and even ideas. Objective Materials Book Glass Tumbler Wood Chair Papers Toy Leather Shoes Plastics Exercises NCERT Solutions for Class 6th Science Chapter 2 1.Name five objects which can be made from wood. Ans : 1.Chair 2.Table 3.Door 4.Pencil 5.Boat 6.Select those objects from the following which shine: Glass bowl, plastic toy, steel spoon, cotton shirt Ans : Glass bowl Steel spoon Match the objects given below with the materials from which they could be made. Remember, an object could be made from more than one material and a given material could be used for making many objects. Object Materials Book Paper

3. Tumbler Glass, Plastic, Wood Chair Wood, Plastic, Metal Toy Wood, Plastic, Metal, Fabric Shoes Leather, Fabric, Rubber Ans : 4. State whether the statements given below are True or False. (i) Stone is transparent, while glass is opaque. (ii) A notebook has lustre while eraser does not. (iii) Chalk dissolves in water. (iv) A piece of wood floats on water. (v) Sugar does not dissolve in water. (vi) Oil mixes with water. (vii) Sand settles down in water. (viii) Vinegar dissolves in water. Ans : (i) False (ii) True (iii) False (iv) True (v) False (vi) False

4. (vii) True (viii) True 5. Given below are the names of some objects and materials: Water, basket ball, orange, sugar, globe, apple and earthen pitcher. Group them as: (a) Round shaped and other shapes (b) Eatables and non eatable Ans : (a) Round shaped and other shapes: Round shaped: Basketball, orange, globe, apple, earthen pitcher Other shapes: Water, sugar (since it is usually in granular form) (b) Eatables and non-eatables: Eatables: Water orange, sugar, apple Non-eatables: Basketball, globe, earthen pitcher List all items known to you that float on water. Check and see if they will float on an oil or kerosene. Ans : Objects that often float on water: Natural materials: Wood, cork, empty plastic bottles (due to trapped air), some fruits (like apples and oranges due to air pockets), ice (though only partially submerged) Man-made materials: Empty plastic containers, life jackets, pool noodles (due to air pockets)