ExamSteps

MATTER: Anything which has mass and occupies space is called matter. It may be solid, liquid or gas.

TYPES OF MATTER: It is of two types :
1. Pure Substance
2. Impure substance
1. Pure Substance: It may be defined as a material which contains only one kind of atom or molecules.
Pure substance is are of two types:(a) Elements (b) Compounds
(a) Elements:Pure substances which are made up of only one kind of atoms are known as elements.They cannot be split up into two or more simpler substances by any of the usual chemical methods.For example, Iron, gold, silver, carbon, oxygen, nitrogen and sodium etc.
Element is also divided in three categories : (i) Metals, for example: Iron, copper, gold, sodium, silver, mercury, etc.
(ii) Non – metals, for example: Carbon, oxygen, sulphur, nitrogen, oxygen, hydrogen, etc.

(iii) Metalloids : Boron, silicon, germanium, etc.
Properties of Metals: 1.)These are lustrous (shine).
2.) All metals are malleable and ductile.( the property of beating metal into thin sheets is calledMalleability and the property of beating them into thin wires is called ductility)
3.) They are sonorous.(metallic sound when hitted)
4.) All metals are hard except sodium and potassium.
5.) All metals are solids at room temperature except mercury which is a liquid.
Properties of Non-metals: 1.) These are dull in appearance.not shiny
2.) They are poor conductors of heat and electricity except diamond which is a good conductor of heat and graphite which is a good conductor of electricity.
3.) They are neither malleable nor ductile.
4.) They are generally soft except diamond which is the hardest natural substance known.
5.) They may be solids, liquids or gases at room temperature.
Metalloids: The elements that have properties intermediate between those of metals and non-metals, are called metalloids.Ex: Arsenic,boron,Selenium,Antimony etc.
Compounds: It is a form of matter formed by combining two or more elements in a definite ratio by mass.It Can be decomposed into its constituent elements by suitable chemical methods.For example: Water (H2O), oxygen (O2), Nitrogen dioxide (NO2), etc.

Next we come to impure substance.Gives your reviews and comments....🙂🙂🙂