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Yogita Ingle 5 years, 9 months ago
The reaction in which alkyl halides on treatment with sodium metal in dry ethereal (free from moisture) solution give higher alkanes is known as Wurtz reaction and is used for the preparation of higher alkanes containing even number of carbon atoms.
Example:
Methyl bromide on treating with sodium metal in dry ethereal solution gives ethane.
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Yogita Ingle 5 years, 9 months ago
Impulse
- Impulse is defined as a force multiplied by time it acts over.
- For example: Tennis racket strikes a ball, an impulse is applied to the ball. The racket puts a force on the ball for a short time period.
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Yogita Ingle 5 years, 9 months ago
Impulse is the big force acting for a very small interval of time. It is represented by J⃗ J→.
Impulse Formula is articulated as
J= F × t
Where,
- Force applied is given as F
- Time interval throughout which force is applied is given as t.
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Yogita Ingle 5 years, 9 months ago
Slow twitch muscle fibres: Contract slowly, but keep going for a long time. Fast twitch muscle fibres: Contract quickly, but rapidly get tired. Endurance or speed. Slow twitch muscle fibres are good for endurance activities like long distance running or cycling. They can work for a long time without getting tired.
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Yogita Ingle 5 years, 9 months ago
Hominoids – all apes. Gibbons, gorillas, chimps, orangs and humans .
Hominids – all modern AND extinct GREAT apes. Gorillas, chimps, orangs and humans, and their immediate ancestors. Not gibbons.
Hominin – Any species of early human that is more closely related to humans than chimpanzees, including modern humans themselves. (At this point, this includes the genuses homo, australopithecus, ardipithecus and paranthropus. These genuses can and do change as various new fossils are found, which either add new genuses, or cast doubt on existing ones. Homo and australopithecus are the two most definite).
Basically, Hominoid is more of a biological reference, while hominids and hominins are more archaeology/anthropology related.
It is important to note that the definitions for hominid and hominin have only been formally accepted fairly recently, so many older textbooks, could refer to early human species as hominids instead of hominins, or vice versa.
Chetna Saini 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
Density and Molar Mass of a Gaseous Substance
pV = nRT
Or n/V = p/RT
So, m/MV = p/RT
d/M= p/RT
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