File Name: physical and chemical properties of metals and nonmetals .zip
The shine on the metallic surface is called the metallic lustre. For example, silver metal is beaten to make silver foil used for decorating sweets.
For example, copper and iron can be drawn into wires. Heat and electricity can pass through them. So, they are called sonorous. We can cut sodium Na and potassium K metals with the help of a knife. Mercury, sodium and potassium are exceptional metals. Examples of metals: iron, copper, gold, aluminium, silver, calcium etc. They break down into a powdery mass on tapping with a hammer. For example, coal and sulphur. Examples of non-metals: phosphorus, sulphur, carbon, oxygen etc.
Sodium also reacts vigorously with O 2. A lot of heat generated in this reaction. Potassium K and Calcium Ca are also active metals and react with water at room temperature. Such metals are stored in kerosene. Some other metals do not do so. For example, iron reacts with water slowly.
For example, zinc Zn replaces copper from copper sulphate solution. In general, more active metals displace less active metals from their solutions. In this case, Zinc is more reactive than Cu, so it replaces copper Cu from copper sulphate solution. Thus, metals are arranged in the order of their decreasing activity. This arrangement is called the activity series. Non-metals react with oxygen to form oxides which are acidic in nature. For example, sulphur when reacts with oxygen forms sulphur dioxide and sulphur dioxide is dissolved in water to form sulphurous acid.
The sulphurous acid turns blue litmus paper red i. Some non-metals such as phosphorus, react with the air. It catches fire if exposed to air. So, phosphorus is stored in water. For example, copper and aluminium wires are used for conduction of electricity, in electrical equipments etc. Iron wires are used for fencing and various other purposes.
Iron sheets are often used for making roof sheds. Alloy like duralium has great strength. It is used in aircrafts, pressure cooker, automobiles etc. Naval brass is used for marine and engineering castings. Many non-metals like iodine, chlorine, sulphur are used in medicine. Phosphorus is essential for our bones and teeth. Toggle navigation. Materials-metals and non-metals-Notes. Some metals like sodium Na react vigorously with water at room temperature. Non-metals are widely used in our daily life.
Some of the interesting uses of non-metals are:.
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. They are called metalloids. Metals react with water to form metal oxides or metal hydroxide and H2 gas is released. Non-metals do not react with water, steam to evolve hydrogen gas.
Metals can be distinguished from non-metals on the basis of their physical and chemical properties. Recall that lustre and hardness are physical properties. .
An element is the simplest form of matter that cannot be split into simpler substances or built from simpler substances by any ordinary chemical or physical method. There are elements known to us, out of which 92 are naturally occurring, while the rest have been prepared artificially. Elements are further classified into metals, non-metals, and metalloids based on their properties, which are correlated with their placement in the periodic table. With the exception of hydrogen, all elements that form positive ions by losing electrons during chemical reactions are called metals.
Metals are placed on the left-hand side of the periodic table , and non-metals on the right. The table summarises some typical properties of metals and non-metals. Some elements have properties that are not typical. For example:. A substance with a high density means it has a high mass for its size.
Metals and non-metals are substances that can be differentiated on the basis of various physical and chemical properties. Metals are the elements that are generally hard as strong metallic bond exists between the atoms. As against non-metals are the elements which are usually soft.
The shine on the metallic surface is called the metallic lustre. For example, silver metal is beaten to make silver foil used for decorating sweets. For example, copper and iron can be drawn into wires.
Physical properties are an important way of distinguishing one material from another.
Apple genius training manual pdf drupal 7 module development pdf downloadReply
The metals and non-metals differ in their properties. Main Group. Al, Ga, In, Sn, Tl, Pb, Bi, Po. alkali elements.Reply
general physical properties of metals and non-metals in the class. You We will learn about the chemical properties of metals in the following. Sections to.Reply