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Yogita Ingle 4 years, 11 months ago
DISCOVERY OF ELECTRON:
The Electron was discovered by J.J Thomson by conducting a Cathode ray tube experiment.
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Electron gain enthalpy is defined as the amount of energy released when an electron is added to an isolated gaseous atom. During the addition of an electron, energy can either be released or absorbed.
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This reactant generally determines when the reaction will stop. The exact amount of reactant which will be needed to react with another element can be calculated from the reaction stoichiometry. The limiting reagent depends on the mole ratio, not on the masses of the reactants present.
From the illustration shown above, it can be observed that the limiting reactant is the reason the reaction cannot continue since there is nothing left to react with the excess reactant. it is the reactant that entirely consumed over the course of the reaction.
Limiting Reagent Examples
Consider 1 mol of oxygen and 1 mol of hydrogen are present to undergo the following reaction.
2H2 + O2 → 2H2O
Since the reaction uses up hydrogen twice as fast as oxygen, the limiting reactant would be hydrogen.
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Yogita Ingle 4 years, 11 months ago
Moles of CO2= 4.4/ 44 =0.1 moles
∴ Number of molecules of CO2=0.1×6.022×1023
=6.022×1022 molecules
But 1 molecule of CO2 contains 2 oxygen atoms.
∴ Number of oxygen atoms=2×6.022×1022
=12.044×1022 atoms
=1.2×1023 atoms
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An electron can emit or absorb energy as radiations only in fixed amounts or bundles called quanta. This is known as quantisation of energy.
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Acyclic compound
These are known as aliphatic compounds. They consist of straight chain or branched compounds.
Example
Cyclic Compounds
Alicyclic Compounds: Alicyclic (aliphatic cyclic) compounds contain carbon atoms joined in the form of a ring
Homo-cyclic : Only Carbon atoms in the rings
Heterocyclic : Sometimes we have atom other than carbon in the ring also
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Posted by Royal Thakur ? 4 years, 11 months ago
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Suspension: A suspension is a heterogeneous mixture in which solids are dispersed in liquids. The solute particles in suspension do not dissolve but remain suspended throughout the medium. For example Paints, Muddy water chalk water mixtures etc.
Properties of a Suspension
• Suspension is a heterogeneous Mixture.
• The particles of a suspension can be seen by the naked eye.
• The particles of a suspension scatter a beam of light passing through it and make its path visible.
• The solute particles settle down when a suspension is left undisturbed, that is, a suspension is unstable. They can be separated from the mixture by the process of filtration.
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Yogita Ingle 4 years, 11 months ago
There are various objectives of planning which are stated below:
(1) To enhance the sports performance: It is also one of the important objectives to improve the sports presentation of athletes or players. Without appropriate scheduling it is terrible to progress the performance of sports persons. In fact, training of sports is impractical if it is not well planned.
(2) To keep good control over all the activities: to keep a decent control over all the actions is additional purposes of planning. Planning and regulator are associated with each other. Planning helps in keeping a good controlling organizing a tournament.
(3) To facilitate proper coordination: this objective of planning is related to facilitate proper coordination among the various member of committees, formed for organizing the competition smoothly. A proper planning helps in making the proper coordination.
(4) To reduce the chances of mistakes: To reduce the chances of mistakes is also a significant objective of planning. A proper plan reduces the chances of mistakes and oversights. If there are a number of mistakes in organizing an event, it will not leave a good impression on the participants.
(5) To increase the efficiency: to increase the efficiency of sports officials in conducting sports events/competitions is one of the main objective of planning. It is the important purpose of planning to increase the capability and efficiency of officials.
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