Matter:
Matter is the term used to describe anything that occupies space and has mass. It is made up of tiny particles called atoms, which are the building blocks of all matter. Matter can exist in three states: solid, liquid, and gas, depending on the arrangement and movement of its particles.

Pure Substance:
A pure substance is a type of matter that has a fixed composition and distinct set of properties. It consists of only one type of particle, either atoms or molecules, and cannot be separated into simpler substances by physical means. Pure substances can be further classified into elements and compounds.

Elements:
Elements are pure substances that cannot be broken down into simpler substances by chemical means. They are made up of only one type of atom. For example, oxygen (O) is an element that consists of oxygen atoms. Other examples of elements include hydrogen (H), carbon (C), and gold (Au).

Compounds:
Compounds are pure substances that are composed of two or more different elements chemically combined in fixed proportions. The elements in a compound are held together by chemical bonds. For example, water (H2O) is a compound made up of two hydrogen atoms and one oxygen atom. Other examples of compounds include carbon dioxide (CO2), sodium chloride (NaCl), and glucose (C6H12O6).

Difference between Elements and Compounds:
The key difference between elements and compounds lies in their composition. Elements consist of only one type of atom, while compounds are made up of different elements chemically bonded together. Elements cannot be broken down into simpler substances, whereas compounds can be separated into their constituent elements through chemical reactions.

Properties of Pure Substances:
Pure substances have specific properties that distinguish them from mixtures. These properties include:

1. Fixed Composition: Pure substances have a definite and fixed composition, meaning they always contain the same elements or compounds in the same proportions.

2. Melting and Boiling Point: Pure substances have specific melting and boiling points, which are characteristic for each substance. These points remain constant as long as the substance is pure.

3. Chemical Reactivity: Pure substances exhibit specific chemical reactions when exposed to other substances. These reactions are unique to each substance and can help identify and differentiate them.

4. Physical Properties: Pure substances also possess specific physical properties such as color, density, conductivity, and solubility, which can be used to identify and characterize them.

5. Homogeneity: Pure substances are homogeneous, meaning they have a uniform composition throughout. This is in contrast to mixtures, which can have varying compositions.

In conclusion, matter refers to anything that occupies space and has mass. Pure substances are a type of matter with a fixed composition and distinct properties. Elements are pure substances made up of only one type of atom, while compounds are composed of different elements chemically combined. Pure substances have specific properties that differentiate them from mixtures, including fixed composition, melting and boiling points, chemical reactivity, physical properties, and homogeneity.

The substance that have mass and volume and occupied space is known as matter


The matter that consists of only one type of particles is called pure substance

EX- Iron, diamond,gold,pottasium etc.