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Yogita Ingle 5 years, 11 months ago
- The similarity in the properties of definite pairs of diagonally adjacent elements in the second and third periods of the periodic table is called diagonal relationship.
- In s-block elements Lithium is the first element of group 1 whereas Beryllium is the first elementsof Group 2.
- Some of their properties do not match with the properties exhibited by other elements of their group.
- Instead their properties resemble the properties of the second element of the following group due to the similarity in ionic sizes and /orcharge/radius ratio of the elements.
- Consequently lithium and magnesium have similar properties whereas Beryllium and Aluminium exhibit similar properties.
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Yogita Ingle 5 years, 11 months ago
In the elements of 4th, 5th and 6th period of the p-block the electrons present in the intervening d and f-orbitals do not shield the r-electrons of the valence shell effectively.
As a result, {tex}{{ns}^{2}}{/tex} -electrons remain more tightly held by the nucleus and hence, do not participate in bonding. This is called inert pair effect.
Posted by Abhinav Tiwari 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Newton’s Law of Cooling states that the rate of heat lost by a body is directly proportional to the difference in temperature between the body and its surroundings.
The law is applicable to small temperature differences. Even when the transfer of heat is due to a combined effect of conduction, convection and radiation, the rate of cooling is proportional to the difference in temperature.
Posted by Abhinav Tiwari 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Bernoulli’s Principle
- For a streamline fluid flow, the sum of the pressure (P), the kinetic energy per unit volume (ρv2/2) and the potential energy per unit volume (ρgh) remain constant.
- Mathematically:- P+ ρv2/2 + ρgh = constant
- where P= pressure ,
- E./ Volume=1/2mv2/V = 1/2v2(m/V) = 1/2ρv2
- E./Volume = mgh/V = (m/V)gh = ρgh
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Yogita Ingle 5 years, 11 months ago
- The metabolic pathway through which the electron passes from one carrier to another, is called the electron transport system (ETS).
- Electron transport system takes place in inner mitochondrial membrane.
- Electron transport chain comprises of the following:
- Complex I: NADH dehydrogenase
- Complex II: succinate dehydrogenase
- Complex III: cytochromes bc1
- Complex IV: cytochromes a-a3
- Complex V: ATP synthase
- NADH2 is oxidized by NADH dehydrogenase and electrons are then transferred to ubiquinone located in the inner mitochondrial membrane.
- FADH2 is oxidized by succinate dehydrogenase and transferred electrons to ubiquinone.
- The reduced ubiquinone is then oxidized with transfer of electrons via cytochromes bc1 complex to cytochrome c.
- Cytochrome c is a small protein attached to the outer surface of the inner membrane and transfer electrons from complex III to complex IV.
- When electrons transferred from one carrier to another via complex I to complex IV, they are coupled to ATP synthesis of ATP from ADP and Pi.
- Oxygen plays a vital role in removing electrons and hydrogen ion and finally helps in the production of H2
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