HOW TO PREPARE FOR XAMS, BOTH AT COLLEGE, AND OUTSIDE.......
Before entering college, we have big dreams about it…we expect it to be a place of fun and excitement, where we can cut classes as per our wish, watch numerous movies with friends, where we can sharpen our talents and become an expert in the field of our liking, etc. But a few months down the line, we are fully baffled by what all is taking place around us: Numerous assignments and class tests, frequent university exams, practicals, projects, etc., etc., etc. We find everyone (except us) doing everything promptly; we find ourselves lost at times and sometimes even thoroughly frustrated. We find it hard to balance our ‘life of fun and excitement’ and our ‘life filled with exams and assignments.’ What I am penning down here are a few tips which can help you to spice up your campus life, and at the same time, get decent grades.
The above-mentioned points can easily be made practical and you will find that you need to actually spend less time with books if you are consistent and review often. The rest of the time is yours! Do things that you like (some geeks like to study then also…no probs, go ahead!), things that you always have dreamt of doing at campus and live the life of your dreams at marvelous college
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Regain Your Brain: Little Known Ways to Increase Memory and Concentration- just, some related information!............
when pressure changes linearly as given in question, if a graph is plotted acc. to the given data, then a line segment with a negative slope is obtained. neways, least bothered bout the slope.so, i) Work done by the process is equal to area enclosed by the graph, i.e. area of a trapezium.
area = 1/2*base(here, the differense in volume)*sum of parallel sides(here, sum of pressures.)
A= 1/2*(200-150)*10-6 *(10+50)*103
A=4.5 J (answer)
ii) no heat is supplied or extracted, i.e. dQ=0
we know that dQ=dU+dW. when dQ is 0, then dU= - dW, i.e. dU=-4.5 J
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The concentration of hydrogen ions in a solution is very important for living things. This is because, since the hydrogen ions are positively charged they alter the charge environment of other molecules in solution. By putting different forces on the molecules, the molecules change shape from their normal shape. This is particularly important for proteins in solution because the shape of a protein is related to its function.The concentration of hydrogen ions is commonly expressed in terms of the pH scale. Low pH corresponds to high hydrogen ion concentration and vice versa. A substance that when added to water increases the concentration of hydrogen ions(lowers the pH) is called an acid. A substance that reduces the concentration of hydrogen ions(raises the pH) is called a base. Finally some substances enable solutions to resist pH changes when an acid or base is added. Such substances are called buffers. Buffers are very important in helping organisms maintain a relatively constant pH.
WAIT..... LOOK INTO THIS ONE ALSO.....
http://en.wikipedia.org/wiki/PH
try referring this site, this might be useful to u .
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http://www.economicexpert.com/a/Valency.htmlsee this site for valencies of the 103 elements.\to find valency yourself, first u should know the atomic number.consider carbon, whose atomic no. is 6,
draw the diagram of the carbon atom yourself.(hope u can)
then observe, it consists of two shells.the innershell consists of 2 electrons and the outermost shell consists of 4 electrons, hence the valency of carbon is 4-.
similarly, take oxygen, atomic no is 8, that means inner shell consists of 2 electrons and the outermost/valence shell consists of6 electons, we know, oxygen atom needs only two more electrons to camplete its octect., i.e. to attain stability, as the max. no of electrons that can fit into the outermost shell is 8, but oxygen has only six.
instead of writing the valency as +6, we should write as -2.
+n means an atom can DONATE the n electrons in its outermost shell, -n means it can still accept n electrons.
Here, oxygen ca accept n=2 electrons easily rather then donating 6 electrons, which is almost impossible.
so we write it as -2
tip: for any element, if the no.of electroms in valence shell is less than or equal to four write the valency as +n, where n is the no.of electrons in the valence shell, if the no. of electrons in the valence shell exceeds 4, then write the valency as, -(8-n).
thats all.
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he readers, jus go to the site below and read the extracts, they might be useful to some off u. if not, plz ignore.
http://jamesallen.wwwhubs.com/tlt.html
DO NOT GET DEPRSSED IF U COULDNT GET GOOD RESULTS....ITS LIFE'S GAME.....TRY AGAIN WITH HEART.....