NCERT Solutions for Class 8 Science Chapter 4 - Free PDF Download
FAQs on NCERT Solutions for Class 8 Science Chapter 4 - Materials : Metals And Non
1. What are the uses of metals and non-metals?
There are vast uses of metals and nonmetals in our day to day lives. All the electronics equipment which we use like TV, mobiles, fridges etc in daily life use metals in the body for different purposes. But one of the key purposes is to facilitate electricity transfer as metals are good conductors of electricity. Metals are also used in medicines as they are needed for conduction of nerve impulses, to carry oxygen by blood, to facilitate enzyme reactions, etc. Some metals are used to cure any micronutrient metal deficiency diseases in humans and animals. Other uses of metals are in Construction industries, jewellery making, machinery, automobiles, and many more. Similarly nonmetals find its uses in medical purposes. Nonmetals are often used as a powerful disinfectant, important ingredient in many chemical solutions but we also use it as an important element in combustion in batteries and in manufacturing. Nonmetals are also used to purify drinking water and swimming pools.
2. What are the differences between metals and nonmetals according to their physical properties
On the basis of their physical properties metals and non-metals can be distinguished in the following ways. All metals are solid at room temperature except mercury, which is a liquid at room temperature but mon-metals can exist as solid, liquid or gas. All metals are lustrous whereas non-metals are non-lustrous. Metals have high densities except for lithium, sodium and potassium and nonmetals have a low density. Metals are malleable and ductile whereas nonmetals are not. Metals are good conductors of heat and electricity and have a high melting point but nonmetals are poor conductors of heat and electricity with low melting and boiling point.
3. Why NCERT solution of class 8 chapter 4 is the most reliable study material?
NCERT Solutions for Class 8 Chemistry Chapter 4 provides the simple and to the point answers to the exercise questions which are extremely helpful in understanding how to write answers in exams. The solutions are also very effective for exam preparations because it saves a lot of time by allowing fast revision. The solutions are designed by expert teachers as per the latest CBSE exam guidelines and syllabus. Hence, these are beneficial in scoring well in the Chemistry paper.
4. What are the topics covered in the chapter metals and non-metals?
The chapter discusses the physical and chemical properties of metals and nonmetals followed by the important reactions and uses of metals and non-metals. Under the physical and chemical properties of metals and nonmetals, following topics are discussed - the importance of metallurgy which is related to the physical and chemical behaviour of metallic and nonmetallic elements, the reactivity of metals and nonmetals, etc.. This chapter also deals with reaction of metals with acids and bases and also clears the concept as why non-metals generally do not react with acids but metals react with acids to produce ‘hydrogen gas’. Displacement reactions are also explained in the chapter.
5. Where can I find the NCERT Solutions for Chapter 4 of Science of Class 8 online?
The link for the solutions for Chapter 4 of Science of Class 8 can be found online on the Vedantu site. Along with these solutions, proper help and guidance can also be availed on the Vedantu site or app for achieving good marks in different exams and across multiple subjects. The students are advised to first give the exercises a try themselves before referring to the solutions. The solutions are free of cost and also available on Vedantu Mobile app.
6. What do you mean by Malleability according to Chapter 4 of Science of Class 8?
The capacity of a metal to be deformed under compression is known as malleability. Metals have a physical characteristic that allows them to be hammered, bent, and rolled into very thin sheets without rupturing. Blowing or rolling might planate a malleable cloth. A prominent example of a metal exhibiting malleability is gold as it shows high degrees of malleability. For more elaboration and details regarding the metals that exhibit malleability as well as the various processes involved, visit the Vedantu site.
7. What do you mean by ductility according to Chapter 4 of Science of Class 8?
The capacity of a material to be drawn or plastically deformed without breaking is known as ductility. As a result, it's a measure of how' soft' or pliable the material is. Steel ductility is affected by the types and amounts of alloying elements present. Platinum is a good example of a ductile metal since it has a high degree of ductility. Visit the Vedantu website for further information and insights on the metals that display ductility, as well as the numerous procedures involved.
8. Do I need to practice all the questions provided in the NCERT Textbook of Chapter 4 of Science of Class 8?
It is advisable to do so. All the properties of metals and non-metals, be it physical, chemical and so on are explained in detail in the NCERT book along with questions that will help you get a reality check of your understanding as well as your problem-solving skills. For more help, you can also take a look at the modules provided by Vedantu on its site or refer to their videos.
9. What do you mean by rust according to Chapter 4 of Science of Class 8?
The term "rust" refers to the red iron oxides that form when ferrous metals corrode. When iron interacts with oxygen and water, the resultant compounds are known as rust. Chemicals including water, salt, vinegar, and bleach have all been proven to accelerate the rusting process. There are no biological risks from rust because it is non-toxic. Rust's major environmental impact is the deterioration of steel and iron infrastructure, such as bridges, cars, and so on. Hence it is not quite preferable.