Here you will find the short notes of carbon and its compound. Carbon is an important constituent of the foods, fuels, household and commercial articles, textile fabrics, perfumes, explosives, dyes, war gases etc. The Earth’s crust has only 0.02% carbon in the form of minerals (like petroleum, coal, carbonates and hydrogen carbonates) and the atmosphere […]
Carbon and its Compound: Short Notes Read More »
Metal and Non-metal question answer are provided in this post including NCERT questions also. 1. Give an example of a metal which :(i) is a liquid at room temperature.(ii) can be easily cut with a knife.(iii) is the best conductor of heat.(iv) is a poor conductor of heat. Answer: (i) Mercury(ii) Sodium(iii) Silver(iv) Lead 2.
Metal and Non-metal: 67 Question and Answer Read More »
The short notes for the chapter Metals and Non-metals are as follows: Metals and Non Metals There are 92 well known naturally occurring minerals of which 70 are metals and rest 20 are the non-metals. Physical Properties of Metals and Non Metals Property Metals Non-Metals Luster They have shining surface. They do not have shining
Metals and Non metals Notes Read More »
In this post you will learn about valence electrons and valency, isotopes, isobars and fractional atomic masses of certain elements. What are valance electrons? The electrons in the outermost shell of an atom take part in all the chemical reactions given by that element. Thus, these electrons describe the combining capacity or valency of an
Learn about Valence Electrons and Valency Read More »
Acids Bases and Salts question answers are provided in this post including NCERT questions also. 1. You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify
Acids Bases and Salts (73 Q/A) Read More »
In this post we will discuss about Bohr’s model of an atom, Bohr-Bury scheme, how to write electronic configuration of an element and nuclear composition. Rutherford’s nuclear model of atom, although a great contribution to the science, could not explain certain observations. A brilliant description of atomic structure was proposed by Neil Bohr in 1913.
Everything about Bohr’s Model of An Atom Read More »
In this post we will discuss about Rutherford and Thomson Model of an atom. After the discovery of electrons and protons, Sir J.J. Thomson proposed the atomic model. This is described below. What is J J Thomson Model of the atom? In 1898, Sir J J Thomson proposed a model of the atom. This model
Rutherford Alpha Scattering Experiment Read More »
The short notes for the chapter Acids Bases and Salts are as follows: Acids Acids are the one which: Produce [H+] in H2O Has sour taste Turns blue litmus red Acts as electrolyte in solution Chemical Properties Of Acids Acids + Metal → Salt + H2e.g., H2SO4 + Zn → ZnSO4 + H2 Acids + Metal Carbonate/Metal
Acids Bases and Salts Notes Read More »
In this post, we will discuss about the anode rays and the discovery of proton and neutron. Anode Rays (Positive Rays or Canal Rays) During his working with cathode rays, Sir J J Thomson had noticed a red glow around the cathode, but on the side opposite the anode. To know the reason for this
Anode rays and discovery of proton & neutron Read More »
This post includes the topics of Class 9 Chapter 4 Structure of Atom, i.e., Cathode rays and the JJ Thomson model and the discovery of electron. Atoms are too small to be seen even with the most powerful microscope and, too light to be weighed even on the most sensitive balance. In this chapter, we
Cathode Rays and Discovery of Electron Read More »
