Periodic classification of element

Periodic classification of element

Introduction All substances are present in the form of elements, mixtures, and compounds. Elements: Composed of the same type of atoms. So far 118 elements are known. Of these, 94 elements are found naturally. we will discussed Periodic classification of element Need for classification: Elements were categorized to make them easier to read and study … Read more

Chapter 1st Science Chemical Reactions and Equations

Chapter 1st Science Chemical Reactions and Equations

Introduction Such changes, which only change the physical state, shape, and physical properties of matter, are called physical changes. Let us see Chapter 1 Science Chemical Reactions and Equations. Example 1) Melting of ice2) Freezing of water3) Evaporation of water. Such changes, which also change the chemical composition and properties of substances, are called chemical changes or reactions.Example … Read more

Metals and Non-Metals Notes

Metals and Non-Metals Notes

Metals and Non-Metals:- Those elements, which conduct heat and electricity, are called metals, metals are those elements which give electrons to form cations. 3- It is solid at room temperature, but mercury (Hg) is in liquid state at room temperature. Example- Aluminum (Al), Copper (Cu), Iron (Fe) etc. Metals have the largest number of elements. … Read more

Acid, Base and Salt

Acid, Base and Salt

Acids are those substances which give hydrogen ions by dissolving in water i.e. substances which give hydrogen ions in aqueous solution are called acids. We will discuss about acid, Base and Salt. Properties of acids  Acids are sour in taste. Good and strong acids are good conductors of electricity. Acids react with metals to release … Read more