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Posted by Thakur Satendra Singh 5 years, 9 months ago
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Sajid Ali 5 years, 9 months ago
Posted by Tinu Jhanjhariya 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
Determine the oxidation number of each atom in the ion. For example, consider the hydroxide ion, which has an oxygen atom and a hydrogen atom. The oxidation number of oxygen is -2, and the oxidation number of hydrogen is +1. Add together the oxidation numbers of all the atoms in the polyatomic ion.
The valency of an atom is equal to the number of electrons in the outer shell if that number is four or less. Otherwise, the valency is equal to eight minus the number of electrons in the outer shell. Once you know the number of electrons, you can easily calculate the valency.
Posted by Vashu Tyagi 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
| Meaning | When the forces exerted on the object, are of equal size but in opposite direction, then the forces are known as balanced forces. | When the forces applied on the object are unequal in size, then the forces are known as unbalanced forces. |
| Magnitude | Equal | Not equal |
| Direction | Opposite | Same or opposite. |
| Stationery object | Stays at rest. | Moves in the direction of greater force. |
| Moving object | Continues to move in the same speed. | Changes its speed and direction. |
| Net force | Zero | Non-zero |
Gaurav Seth 5 years, 9 months ago
Balanced Force:
They don’t bring any change to the object.
They are equal in magnitude.
The result is always zero.
The object remains stationary.
They do not need any external force to balance, because it is already balanced.
Example: book kept on a table
Unbalanced Force:
They change the position of the object.
They are not equal in magnitude.
The result is always greater than zero.
The object doesn’t remain stationary.
They need an external force to balance.
Example: book pushed from the table
Posted by Rajesh Meena 5 years, 9 months ago
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Gurandeep Kaur 5 years, 9 months ago
Gurandeep Kaur 5 years, 9 months ago
Posted by Inder Dhaliwal 5 years, 9 months ago
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Posted by Utsav Mishra 5 years, 9 months ago
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Posted by Utsav Mishra 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
Mole is defined as any substance that contains elementary entities (atoms, molecules, ions) as there are atoms in 12 grams of pure carbon-12 (isotope of carbon with atomic weight 12). This equals to Avagadro’s constant equal to value 6.023 × 1023.
Posted by Rajesh Meena 5 years, 9 months ago
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Posted by Sakshi Shinde 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
Energy is the ability to perform work. Energy can neither be created nor destroyed. It can only be transformed from one kind to another. The unit of Energy is same as of Work i.e. Joules.
Power is a physical concept that has several different meanings, depending on the context and the information that is available. We can define power is the rate of doing work. It is the amount of energy consumed per unit time.
Posted by Harshita Rathore 5 years, 9 months ago
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Meghna Thapar 5 years, 7 months ago
A colloid is a homogeneous looking heterogeneous mixture. Particles are dispersed in a continuous medium. Particles having a size between 10-10 m and 10-7m. Colloids are big enough to scatter a beam of light passing through it and make its path visible.
Posted by Sheetal Rajpoot 5 years, 9 months ago
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Posted by Jharna Banerjee 5 years, 9 months ago
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Posted by Jharna Banerjee 5 years, 9 months ago
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Meghna Thapar 5 years, 7 months ago
21% of Oxygen is found in the elemental form in the atmosphere. It also occurs extensively in the combined form in the Earth’s crust as well as also in the air in the form of carbon dioxide. In the crust, it is found as the oxides of most metals and silicon, and also as carbonate, sulphate, nitrate and other minerals. Oxygen is returned to the atmosphere by photosynthesis.
Posted by A.K Vishal 5 years, 9 months ago
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Posted by Sanjana M 5 years, 9 months ago
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A.K Vishal 5 years, 9 months ago
Yogita Ingle 5 years, 9 months ago
Avogadro number
The number of units in one mole of any substance is defined as its molecular weight in grams which is equal to 6.0221 × 10 23.
Posted by Sajid Ali 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
(i) Avogadro’s number is the number of paticle(atoms , ions or molecules) constituted in 1 mole of substance
Value of Avogadro’s number = {tex}6.022 × {10}^{23}{/tex}
Posted by Sajid Ali 5 years, 9 months ago
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Posted by Vinayak Tripathy 5 years, 9 months ago
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Posted by Rounak Kumar 5 years, 9 months ago
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Vrushali Shete 5 years, 9 months ago
Posted by Nikhil Gupta 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
Carbon-12 is considered as unit to calculate atomic mass. Carbon-12 is an isotope of carbon. The relative mass of all atoms are found with respect to C-12.
One atomic mass = 1/12 of the mass of one atom of C-12.
This means atomic mass unit = 1/12th of carbon-12
Thus atomic mass is the relative atomic mass of an atom with respect to 1/12 th of the mass of carbon-12 atom. ‘amu’ is the abbreviation of Atomic mass unit, but now it is denoted just by ‘u’.
The atomic mass of hydrogen atom = 1u.
This means one hydrogen atom is 1 times heavier than 1/12th of the carbon atom
Posted by Utsav Mishra 5 years, 9 months ago
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Yash Jain 5 years, 9 months ago
Gaurav Seth 5 years, 9 months ago
The fifth state of matter is BEC (Bose-Einstein Condensate). A Bose–Einstein condensate is a state of matter formed by bosons cooled to temperatures very near to absolute zero (0 kelvin or -273.15°C). Under such supercooled conditions, a large fraction of the atoms collapse into the lowest quantum state, at which point quantum effects become apparent on a macroscopic scale.
Posted by Vivek Singh 5 years, 9 months ago
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Gaurav Seth 5 years, 9 months ago
Immediate cause :
- Immediate cause of a disease is the primary factor causing a disease.
- Immediate cause of disease are infectious organisms like virus , bacteria , fungi , protozoan etc.
- Virus causing diarrhoea is the immediate cause.
Posted by Sumit Raj 5 years, 9 months ago
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Rishi Chawla 5 years, 9 months ago
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Saloni Kumari 5 years, 9 months ago
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