File Name: metals and nonmetals class 8 cbse notes .zip
- CBSE Class 8 Science Chapter 4 Revision Notes
- Metals and NonMetals Class 10 Notes Science Chemistry
- Materials: Metals and Non-Metals Class 8 Notes Science Chapter 4
Elements are classified broadly into two categories on the basis of properties: Metals: Iron, Zinc, Copper, Aluminium etc. Apart from metals and non-metals some elements show properties of both metals and non — metals, e. Silicon, Arsenic, Germanium.
CBSE Class 8 Science Chapter 4 Revision Notes
Chemical Properties of Metals and Non-metals: Reaction with Oxygen: Both metals and non-metals when burnt in oxygen from their oxides. Oxides of metals are basic in nature while that of non-metals are generally acidic in nature e. Reaction with Water: Some metals react with water to produce metal hydroxide and hydrogen gas.
Generally, non-metals do not react with water. Reaction with Acids: Metals react with dii. Generally, non-metals do not react with dil.
Displacement Reaction: More reactive metals displace less reactive metals from their metal compounds in aqueous solutions. Atom: Atom is the smallest particle of matter which cannot be divided further by any physical means.
Atoms are the basic units from which molecules and ions are formed. Displacement reaction: More reactive metals displace less reactive metals from their compounds in aqueous solutions. Ductility: The property of metals by which they can be drawn into wires is called ductility. Elements: Substances whose molecules contain only one type of atoms are known as elements.
Malleability: The property of metals by which they can be beaten into thin sheets is called malleability. Metals: The materials which are generally hard, lustrous, malleable, ductile, sonorous and good conductors of heat and electricity are called metals.
Metalloids: Elements which possess characters of both metals and non-metals are called met. Non-metals: Materials which are soft, dull in appearance, brittle, not sonorous and poor conductors of heat and electricity are called non-metals. Sonorous: Metals are called sonorous because they produce a specific ringing sound.
Good conductors of heat and electricity. Metals like sodium and potassium are soft and can be cut with a knife. Mercury is the only metal which is found in the liquid state at room temperature. Physical Properties of Non-metals: Non-metals are soft and dull e. Non-metals are generally brittle, i.
They are not sonorous. They are poor conductors of heat and electricity. Reaction with Bases: Metals react with bases to produce hydrogen gas. Uses of Metals and Non-metals Metals are used in making machinery automobiles, aeroplanes.
Non-metals are also used in day-to-day life. Some examples are: oxygen is essential for life. Ductility: The property of metals by which they can be drawn into wires is called ductility Elements: Substances whose molecules contain only one type of atoms are known as elements.
Hardness: Metals are hard, on the other hand, non-metals are generally brittle. Metals: The materials which are generally hard, lustrous, malleable, ductile, sonorous and good conductors of heat and electricity are called metals Metalloids: Elements which possess characters of both metals and non-metals are called met.
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Metals and NonMetals Class 10 Notes Science Chemistry
It will discuss what metals and non-metals are along with proper descriptions and examples. Every feature will be properly demonstrated using the right illustrations. Previously, students have studied metals and non-metals in a simpler version. This time, it will take you a little deeper into the concepts. You will have to figure out how to prepare the chapter by going through the chapter properly and refer to Class 8 Science Metals and Non-metals notes accordingly. Let us check how the revision notes can help students to study this chapter.
Metals: Those materials which possess the characteristic of being hard, shiny, malleable, fusible, ductile, etc. Few examples of metals are iron, gold, silver, aluminium, copper, etc. Physical Properties of Metals: a Malleability: It is that property of metals which allows them to be beaten into the thin sheets. Due to presence of this property, the shape of iron nail and aluminium wire can be changed on beating. The silver foils used for decorating sweets and the aluminium foil used for wrapping food are possible because of malleability property of metals.
Learning the important concepts is very important for every student to get better marks in examinations. The concepts should be clear which will help in faster learning. A majority of the known elements are metals. All metals are solid except mercury, which is a liquid metal. There are 22 non metals, out of which 10 nonmetals are solids, one nonmetal bromine is a liquid and remaining 11 nonmetals are gases. NON-METALS The elements which are usually brittle and can not be used to make sheets or wires, can not be polished and bad conductor of heat and electricity except graphite are called non-metals.
CBSE Class 8 Science Notes Chapter 4 Materials: Metals and Non-Metals Pdf free download is part of Class 8 Science Notes for Quick.
Materials: Metals and Non-Metals Class 8 Notes Science Chapter 4
Register Now. Hey there! We receieved your request. Non-metals such as coal or sulphur are poor conductors of heat and electricity. Graphite is an exception as it is a good conductor of electricity.
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