In this post, questions and answers of atoms and molecules are provided which includes NCERT questions as well. 1. In a reaction 5.3 g of sodium carbonate reacted with 6 g of ethanoic acid. The products were 2.2 g of carbon dioxide, 0.9 g water and 8.2 g of sodium ethanoate. Show that these observations […]
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In this post, periodic classification of elements question answers are provided which includes NCERT questions as well. 1. Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out. Answer: Yes, Dobereiner’s triads also existed in the columns of Newland’s Octaves. For example, Li, Na, K.If we consider lithium (Li) as
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In this post, you will get notes of periodic classification of elements chapter. Dobereiner’s Triads Dobereiner’s found that when elements are arranged into groups of three in the order of their increasing atomic mass, the atomic mass of the element; which comes in the middle, is the arithmetic mean of rest of the two. He
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Carbon and its Compounds questions and answers are provided in this post including NCERT questions. 1. What would be the electron dot structure of carbon dioxide which has the formula CO2? Answer: The electron dot structure of carbon dioxide molecule is as: 2. What would be electron dot structure of sulphur which is made up
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In this post, you will study, how to find log and antilog values of a given number. Explanation is provided using examples. Logarithms and Antilogarithms In higher classes, many times we encounter such numbers which are either too big or too small. So, to make the calculations easy and time saving, we use logarithms form
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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
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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.
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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
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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
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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
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