Category: Class 8

Chemical reaction of non metals

a) Reaction with oxygen : Non metals reacts with oxygen (in air) to form non metallic oxides. This non metallic oxides are acidic or something neutral in nature. Carbon is a non metal . Carbon burns in air ( in the presence of oxygen ) it react with oxygen to form their oxides . That […]

Combustible Substance

The substance which is burn in air ( presence of oxygen ) to produce heat and light are called combustible substance. • Combustible substance catch fire easily . • The substance that undergoes combustion is called as combustible substance. • It is also called as fuel • It may be solid, liquid gaseous . e.g. […]

Displacement reaction

A chemical reaction in which a more reactive metal replace a less reactive metal and form it’s salt solution is known as displacement reaction. e.g. 1) when iron nails out in copper sulphate solution then colour of solution changes from blue to light green and reddish brown coating of copper is form on iron. 2) […]

Chemical properties of metals

Some metals are chemically very reactive where as other metals are less reactive . the arrangement of metal in a vertical column in the order of decreasing reactivity is called activity series of metals. a) Reaction with oxygen : Metals react with oxygen under different condition to form metallic jioxides (basic nature). These metallic oxides […]

Physical properties of non metals

1) Non metals may be solid, liquids, gases. Solids- carbon, sulphur, phosphorous, Liquid- bromine. Gases- oxygen, hydrogen, nitrogen. 2) Non metals are soft . But diamond is the hardest natural substances. 3) Non metals do not have lustrous . They do not reflect light . Some have a dull lustre  (such as coal) Except iodine […]

Physical Properties of Metals

1.) Metals are solid in nature at room temperature( except mercury it is liquid in state.) 2.) Metals are generally hard and strong ( except lithium, potassium, sodium they can be cut by knife) 3.) Metals have metallic cluster i.e they are shiny and reflect light. 4.) Metals are ductile.( the property by which metal […]

Uses of metals and non metals

❖ Uses of metals ▪ Metals are use for making machinery and automobiles ▪ It is also use for making cooking utensils and water boilers. ▪ It is use to making trains, satellites, industrial gadgets. Some metals uses are given below : ▪ Iron : Iron is use for making pins,nails , nuts, bolts ,tools, […]

Metalloids

Metalloids are the smallest class of elements rather than others two classes of elements that’s are metals and non metals. Metalloids are the compound which show properties in between metals and non metals . It look like metals but mostly behave like non metals . They are also called as semi metals . All metalloids […]

Metals

As we know, There are total 118 elements present in modern periodic table . out of which 92 are naturally occurring 26 are man made or synthetic elements . In naturally occurring elements 70 are metals and about 22 are non metals. What are metals ? o Metals are the substance that are naturally found […]