NCERT Solutions for Class 8 Science Chapter 4- Materials Metals and Non-Metals
NCERT Solutions for Class 8 Science Chapter 4 – Materials: Metals and Non-Metals have been prepared according to the latest Syllabus approved by CBSE. The NCERT Solutions for Class 8 Science Chapter 4 contains a total of 11 questions that cover different topics of Metals and Non-Metals. Some important topics covered in this chapter include physical and chemical properties of metals and non-metals, and uses of metals and non-metals.
Our NCERT Solutions of Class 8 Science Chapter 4 are easy to understand and help you remember the tricky topics better. They have been specially designed to keep your concepts of Metals and Non-Metals clear and help you develop a strong conceptual foundation. Our NCERT Solutions make the learning process an easy task for you. To gain the confidence to tackle different question types in your Class 8 Science exam we would highly recommend you to follow NCERT Solutions of Class 8 Science by Instasolv.
These solutions play an important role while preparing for the other competitive exams as well. They have been developed in a manner to help you learn and revise all the topics of ‘Materials Metals and Non-Metals’ rapidly. With all study material in one place laid out in a well-structured manner, you can study anywhere and anytime.
NCERT CBSE Class 8 Science Chapter 4 Important Topics
Chapter 4 of NCERT Solutions for Science Class 8 tells us that commonly found substances can be divided into categories of metals and non-metals by their specific properties. NCERT Class 8 Science Chapter 4 – Materials: Metals and Non-Metals comprises many crucial topics important from exam viewpoint. Some of the topics covered in our comprehensive NCERT Solutions for Class 8 Science Chapter 4 – Materials: Metals and Non-Metals are as follows.
CBSE NCERT Class 8 Science Chapter 4 starts with a general introduction of the topic, followed by detailed discussions. It tells us what metals and non-metals are and informs us about the various properties and uses of metals and non-metals.
- Physical Properties of Metals and Non-metals
this part of the NCERT Class 8 Science Chapter 4 establishes that certain materials are lustrous, hard, sonorous, good conductors of electricity and heat, ductile and malleable. The materials that usually have these properties have been termed as metals. Some metal examples are Iron, Aluminium, Copper, Magnesium and Calcium.
This section also teaches us about materials that break into a powdery substance on beating with a hammer, are bad conductors of electricity and heat and not sonorous. Such materials are known as non-metals. Some examples of non-metals are carbon, phosphorus, oxygen, and sulphur.
- Chemical Properties of Metals and Non-metals
This part of the NCERT Class 8 Science Chapter 4 deals with the various chemical reactions of metals and non-metals.
- Reaction with Oxygen
This section teaches you that when metals are burnt, they react with oxygen and create metal oxides that are elementary in nature. Non-metals react with oxygen to produce non-metallic oxides that have acidic properties. This property is responsible for rusting of Iron and tarnishing other metallic items.
- Reaction with Water
When some metals come in contact with water, react and produce metal hydroxides and hydrogen gas. Some metals react vigorously with water like Sodium, and some react slowly like Iron. Generally, when non-metals come in contact with water, they don’t react. Some non-metals like phosphorus are stored in water in order to prevent their reaction with air.
- Reactions with acids
This part of the NCERT CBSE Class 8 Science Chapter 4 establishes that when metals come in contact with acids, they react with acids and create hydrogen gas and metal salts. The released hydrogen gas is identified with the ‘pop’ sound. Usually, non-metals are not reactive to acids.
- Reactions with bases
Some metals react with bases and produce hydrogen gas again identified with the pop sound.
- Displacement Reactions
Some metal displaces other metals from its compound in aqueous solution. A common reaction of this type is –
Copper Sulphate (CuSO4) + Zinc (Zn) → Zinc Sulphate (ZnSO4) + Copper (Cu)
(Blue) (Colourless) (Red)
Further, you also come to know here that the reaction given above would not take place the other way, i.e. Copper will not replace Zinc from its solution. So, the rule is that a more reactive metal can substitute a less reactive metal, but a less reactive one cannot substitute a more reactive metal.
- Uses of Metals and Non-metals
This part of the NCERT CBSE Class 8 Science Chapter 4 mentions some uses of metals and non-metals in everyday life. Metals can be used for the creation of automobiles, machinery, trains, aeroplanes, industrial gadgets, satellites, water boilers, and cooking utensils. Non-metals are used in fertilisers, in the process of water purification, in antiseptic solutions, and in crackers. Oxygen is an essential non-metal that we use for breathing.
CBSE NCERT Class 8 Science Chapter 4 – Exercise Discussion
This is a significant part of the chapter which will prepare you for your exams. Our NCERT Solutions for Class 8 Science Chapter 4 – Materials: Metals and Non-Metals contains a total of 11 questions.
Here is a list of the questions and their components:
- Question no. 1 asks you to identify the metals among the given elements. This question helps you become clear with the fundamentals of metals and non-metals.
- Question no. 2 to 5 are based upon general properties of metals and non-metals discussed in the chapter.
- Question no. 6, 7, 9 and 10 helps you practice your analytical skills where they ask you to apply the knowledge of chemical and physical properties to find out solutions to some daily life situations.
- Question no. 8 asks you to match the items in two columns based on uses of metals and non-metals in daily life.
- Question no. 11 asks you to find the reason for the change in weight of a gold item. Here you are supposed to apply the knowledge of displacement reactions shown by metals, as gold is a metal and is less reactive.