Quiz on human eye
Loading… See also-HUMAN EYE AND COLOURFUL WORLD / WONDERS OF LIGHT PART – I
Class X
Property of Sound Waves that Sound needs Material Medium to Travel
The sound waves need material medium to travel because they travel by the vibrations of particles of the medium. The material medium is gas, liquid and solid. Sound waves are called mechanical waves as they need a material medium for their travel. An activity described below tells that sound can not travel through vacuum. The …
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Previous Year’s CBSE Board Questions – Life Processes – Transportation
Transportation What will happen to a plant if its xylem is removed? (Delhi 2009, 1 mark) Need clues – Click here (a) Draw a sectional view of the human heart and level on it – Pulmonary arteries, vena cava, left ventricle.(b) Why is double circulation of blood necessary in human beings? (AI 2009, 5 marks) …
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Some Important Carbon Compounds -Ethanol and Ethanoic acid
ASSESSMENT – CLICK HERE Previous Year’s CBSE Board Questions -Some Important Carbon Compounds – Ethanol and Ethanoic acid [googlepdf url=”https://freakgenie.com/wp-content/uploads/2019/02/carbon-compd-ethanol-and-ethanoic-acid.pdf” width=”100%” height=”2560″] ASSESSMENT – CLICK HERE Previous Year’s CBSE Board Questions -Some Important Carbon Compounds – Ethanol and Ethanoic acid
Previous Year’s CBSE Board Questions -Some Important Carbon Compounds – Ethanol and Ethanoic acid
Some Important Carbon Compounds – Ethanol and Ethanoic acid 1. Write the name and molecular formula of an organic compound having its name suffixed with ‘-ol’ and having two carbon atoms in its molecule. Write balanced chemical equation to indicate what happens when it is heated with excess of conc. H2S04 and the name of …
Common Behaviour of Acids and Bases
In the following section, we will find the answers of following questions- (i) All acids have similar chemical properties. All bases have similar chemical properties. What lead to this similarity in properties? (ii) How acids and bases are different chemically? Group A Group B ACIDS BASES Hydrochloric acid (HCl) Sodium hydroxide …
Periodic Classification of Elements – Part – 1
Table of Contents – Need of Classification What is Periodic Table and Periodicity? Dobereiner’s Triads Newlands’ Law of Octaves
Importance and Limitations of Modern Periodic Table
Importance of Modern Periodic Table 1. Based on atomic number – The arrangement of elements in modern periodic table is according to their increasing order of atomic number. Atomic number increases by 1 unit (not fractional) in going from one element to the next element and equal to the number of electrons. Thus, the …
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Arrangements in Modern Periodic Table (Long Form of Periodic Table)
Table of Contents – Arrangement in Periodic Table Groups Periods Frequently asked Questions (FAQ’s) Next – Importance and Limitations of Modern Periodic Table The arrangement in periodic table is given by Bohr so it is also known as Bohr’s table or Long form of periodic table. This table is prepared on the basis of – …
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INTRODUCTION TO MODERN PERIODIC TABLE
Table of Contents – Introduction Why atomic number is better choice of classification than atomic mass? Modern Periodic Law Why periodicity in properties occur? How are electrons distributed in different orbits(shells)? Or How can be found electronic configuration of an element? The modern periodic table of elements is based on Mendeleev’s observations. The only difference …
Introduction to Organic Chemistry and Vital Force Theory
♦ Earth crust has only 0.02% carbon in the form of minerals (e.g. – carbonates, bicarbonates, coal, petroleum etc.) and atmosphere has 0.03% carbon dioxide. Inspite of its availability in such a small amount, it is highly important for our lives. ♦ Except water most of …
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Allotropes of Carbon
Carbon can exist in various physical forms in the nature with widely varying physical properties, but identical chemical properties. Such characteristic is called allotropy and the different forms are called allotropic forms or allotropes. The difference among allotropes lies in the manner in which the carbon atoms are bonded to one another. Allotropes are exclusively …
Why does Carbon always form Covalent Bond?
Carbon has four valence electrons. To attain noble gas configuration of the nearest noble or inert gas (He = 2 or Ne = 2,8), there are following possibilities – (1) It could gain 4 electrons and form C –4 anion. By that way, it can achieve noble gas configuration (Ne = 2,8) having 8 electrons in the …
Electron Dot Structure or Lewis Structure
In the Electron dot structural presentation, dots or crosses represent valence electrons which are put around an atom. Covalency of an atom is equal to the number of covalent bonds formed by the atom. Read First – Carbon and its Compounds – Introduction What is the Versatile Nature of Carbon? (a) When two atoms share one …