CBSE Class 6 Science Revision Notes Chapter 4

CBSE Class 6 Science Revision Notes Chapter 4  – Sorting Materials into Groups

Students will learn the properties of materials and their classifications in Class 6 Science Chapter 4 “Sorting Materials into Groups” Notes. This chapter discusses the classification of materials as well as their characteristics and other related topics. .

It is important for students to build a strong understanding of these fundamentals of the subject to be better prepared for advanced concepts in higher classes. These notes are apt for students to master the contents of this chapter and also revise the chapter easily. 

Revision Notes for CBSE NCERT Class 6 Science Chapter 4 

What is Matter?

Anything that has mass and occupies space is considered to be made of matter. In our daily lives, we come into contact with a wide variety of materials that are used to make the things around us. 

A substance that is used to make things is called a material. This material could be used to create a wide range of unique objects. An object may be constructed from a single type or from different types of materials.

Properties of Material

Various materials can be found in nature. While some are created naturally, others are artificially or synthetically made. It is crucial to group or categorise these materials for ease of usage  as well as for future research on these materials.. 

Objects with specific properties are grouped together into a single category. Simple object classification can be done based on the initial characteristic or a visible quality such as appearance. 

The hardness of the object is the next topic discussed in this chapter. Students are encouraged to touch various objects to comprehend this concept. A wooden object will feel hard to the touch, whereas a rubber or cloth object will feel soft. Then, students are asked to group the objects based on these characteristics. Solubility is the next important characteristic. Students will test how well certain items dissolve in a glass of water to determine their solubility. Soluble solids are substances that, when dissolved in a liquid, form a solution. (i) An insoluble solid is one that does not dissolve in water.


Extramarks’ CBSE Class 6 Science Chapter 4 Revision Notes on – Sorting Materials into Groups makes – it simple for students to review the chapter in one place. With the help of these thorough notes, students will be able to quickly and efficiently review the chapter’s key ideas and points. The CBSE Revision Notes provided by Extramarks give a better understanding of the chapter’s foundational concepts. These revision notes effectively summarise the chapter and list key points of all the concepts to help students revise before exams.

FAQs (Frequently Asked Questions)

1. What are materials?

Materials are substances or mixtures of substances with mass, volume, shape, and space. They can be classified based on their physical states, material properties, and other factors. Materials can be clean or dirty.  They are classified according to their biological or geological origins. Extramarks’ CBSE Class 6 Science Chapter 4 Revision Notes provide a detailed explanation of these classifications. 


2. How are materials sorted into groups?

Materials are arranged according to the distinctions and similarities among the items in a given group. Two distinct bases can be used to group materials or objects for convenience. The first step is to determine whether the substance can be used to create new items. For example, wood is a substance which can be used to create tables. Materials are also classified into substances according to their hardness or softness and whether they are soluble in water or not.

3. Why should materials be sorted into groups?

Materials’ properties are grouped together based on their similarities and differences. Materials are organised into groups for ease of use and research. By grouping items, we save time, energy, and make our work easier.

Things are easier to arrange in a specific order when they are organised by grouping them. Things are much easier to manage when they are grouped together. It is much easier to understand the attributes of objects when they are grouped. When two items are grouped together, it is also easier to compare them.


4. What does the property of a material signify?

In contrast to its chemical or mechanical components, a substance’s physical properties describe its overall physical state. Texture, density, mass, melting point and boiling point, as well as electrical and thermal conductivity, are some of these physical characteristics. Based on their different physical or chemical properties, various materials can be grouped together. 


5. What does one mean by physical properties?

A material’s physical properties are those that can be observed or measured without changing the substance’s identity. Physical characteristics include things like colour, density, hardness, melting and boiling points, among others. The physical characteristics of various materials are particular to that substance and are helpful for classifying the materials into various categories. Therefore, being aware of the  physical characteristics of a material can be useful.


6. What does one mean by chemical properties?

The feature of a material that is observable during a chemical reaction is known as its chemical property. Flammability, toxicity, enthalpy of formation, pH value, oxidation states, and chemical stability are a few of the most crucial chemical properties. These provide  details about the  characteristics of any product and can be used to group materials according to their chemical composition.

7. What are the physical properties of materials?

Materials may be shiny (lustrous) or rough (non- lustrous) in appearance. Almost all metals are lustrous, whereas wood, rubber and other materials are non-lustrous.

Materials can be both hard and soft. Hard materials are rocks, iron, etc. Hard materials are :

  • Brittle: Materials that, when hammered,  break into smaller pieces or powder. For instance, rocks, glass, and salt.
  • Malleable: Materials that can be beaten  into thin sheets. For example, metals are malleable. 
  • Ductile: Materials that can be drawn into thin and long wires. For example, metals are also ductile. Soft materials are wood, rubber, and fibres.