Things you need to know before 7th Standard CBSE chemistry
Science is a very interesting subject. Science is everything. It has 3 parts- PHYSICS, CHEMISTRY AND BIOLOGY.
If you see the NCERT science books starting from the 6th standard, you will notice that the first introduction to Chemistry is in the 7th standard, with a chapter called “Acids, Bases and Salts”. The chapter is full of chemical equations and reactions, the basics of which we have never learnt. We have never learnt anything about the structure of atoms, or molecules, or ions, or elements, or compounds, or chemical symbols etc.
Chemistry is a very important subject. It tells us about various things like , metals, acids, bases and their chemical formulas etc. However, the subject needs to be studied in a certain order or sequence. In chemistry, if we try to learn metals, acids, bases and their chemical formulas without learning the basics of chemistry like elements, compounds, atoms, molecules etc., it will be hard to learn and boring. I will try to list a few concepts that I picked up from the 9th standard NCERT textbook which will be useful for all my fellow students.
Elements is a pure substance which cannot be broken down by chemical means, consisting of identical atoms. For ex. carbon(C), IRON (Fe). Some metals are made by their English name and some by their Greek name. For example- Gold- Its chemical name is Au because its chemical name is formed by its Greek name (Aurum). Hydrogen- Its chemical name is H because its chemical name is formed by its English name (hydrogen). POINT TO REMEMBER- If a chemical name of a metal or element has 2 letters, its 1st letter would be capital and 2nd would be small. For ex. IRON. Its chemical name is Fe (f capital and e small) not FE.
Compounds- A compound is made up of 2 or more elements. For example- CO2(Carbon dioxide)is made up of 2 elements (carbon and oxygen). So, it is a compound. Same way H2SO4(Sulfuric Acid), it is made up of 3 elements (hydrogen, Sulphur and oxygen).
ATOMS- The building blocks of all matter are atoms. They are extremely small, they are smaller than anything that we can imagine.
POINT TO REMEMBER- Every element has an atomic mass.
Here are some of our notes: The underlined text is sufficient to understand at 7th Standard levels.
So, by the end of this whole article, I shall recommend that these things should be kept in mind that the learning of basics is important if we have to learn Chemistry.