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PERIODIC CLASSIFICATION OF ELEMENTS Mendeleev’s Periodic Table To organize all the 63 elements then known, Mendeleev composed a table known as the periodic table. Mendeleev’s Periodic Table arranged elements in order of increasing atomic mass. The atomic mass is the mass of an atom. It is about equal to the mass of the protons plus […]

Acids, Bases, and Salts Properties of acids Acids have a sour taste Acids change the colour of blue litmus to red Properties of bases Bases have a bitter taste Bases change the colour of red litmus to blue Indicators It helps us to identify whether a substance is acidic or basic with the help of

Nervous System Nerve impulses are transmitted between areas of the body via a network of nerve cells and fibres. This is called the Nervous system. When you touch a hot object, you sense that it is hot and suddenly pull off your hands. Have you thought about how you recognise that the object is hot?

PERIODIC CLASSIFICATION OF ELEMENTS When the big bang happened, only the proton and neutron occurred. But if you see in the modern periodic table, there are 118 elements. I have wondered how this element comes, is it natural or man-made elements. Let’s get some crazy ideas on the periodic table. From 118 elements of the periodic

Carbon and it’s compounds Bonding in Carbon Now that you know how crucial carbon is for human survival on our planet, let’s look at the features of carbon compounds. They are poor conductors of electricity Low Melting point and Boiling point gives us the conclusion that the force of attraction between the molecules is weak

METALS AND NON-METALS Physical properties Malleability– The property of a metal to be beaten into thin sheets is called malleability. Eg.: Gold and silver. Ductility– The property of metal to be drawn into thin wires is called ductility. Now that we have discussed some of the physical properties that help us differentiate between metals and

Summary of acid and base reaction with metals As you all know acids are substances that have a pH below 7, while bases are substances with a pH above 7. We can identify whether a substance is acidic or basic with the help of various indicators. Today we will see how these acids and bases

Types of chemical reaction Combination Reaction Combination Reaction A chemical reaction in which two or more compounds react to give a new product. Let’s see some everyday reactions to understand this- Burning of coal     C(s) + O2(g) →CO2(g) Formation of water from H2(g) and O2(g)     2H2O + O2(g) →2H2O(l) Formation of calcium hydroxide (slacked lime)

How to balance a chemical reaction? Balanced chemical equation is an equation in which the number of atoms for each element on the reactant side and product side is equal. Let us see the steps to be followed for writing a balanced chemical equation Fe + H2O       Fe3O4 + H2 Step 1- To balance

CLASS 10 CBSE SYLLABUS Science Maths Science TERM 1 Chapter 1: Chemical reactions and equations Chapter 2: Acids, Bases and Salts Chapter 3: Metals and Non Metals Chapter 6: Life processes Chapter 10:  Light – Reflection and Refraction Chapter 11: Human eye and colourful world TERM 2 Chapter 4: Carbon and its compounds Chapter 5: