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Topic : Previous IIT-JEE mole concept questions
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2736
Engineering Entrance
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JEE Main
Previous iit-jee mole concept questions Assignment Level-I 1) .a) Calculate the mass of 5 gram atoms of calcium. Atomic mass of alcium is 40.b) Calculate the mass of 1.5 gram molecules of water. 2) Calculate the number of gram atoms and gram molecules in 25.4 mg of iodine (12). Atomic mass of I = 127 amu. 3) How much sulphuric acid (H2SO4) can be obtained from 5 kg of pure sulphur (S8).4) What is the molar volume of water at 273 K. Density of water = 1.00 gm/ cm^3.5) 6.02 x 10^20 mole
Topic : chemical kinetics graph
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1262
Engineering Entrance
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JEE Main
some typical linear plots for reactions of different orderspls do comment and rate
Topic : Previous IIT-JEE Atomic Structure questions
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3488
Engineering Entrance
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JEE Main
1. How many photons of light having a wavelength of 420 nm are necessary to produce 1.2J energy ?2. Calculate wave number and frequency of radiations having wavelength 5800.3. Calculate the energy in eV of (i) He+ and (ii) Be 3- in the first excited state.4. Calculate ratio of de-Broglie wavelength of electron to proton moving with a velocity of 10^5 m/sec.5. Find out the number of waves made by Bohr electron in one complete revolution in its third orbit. Also calculate the number of revolutions per second that this electron makes around the nucleus?6. Calculate uncertainty in position of a particle when uncertainty in the momentum is (a) 1 x 10^-2, gm cm sec^- 1 an
Topic : How to Draw the Atomic Structure of Atoms
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166
Medical Entrance
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NEET
Drawing atomic structure requires only a simple understanding of the components of atomic structure. If you understand how protons and electrons relate to one another, as well as how neutrons aid in comprising atomic mass, the rest is cake.1. Draw a circle on the page. For the purposes of this article, we'll use carbon as an example. The process is the same for whatever you're drawing, however. Write a letter "C" in the middle of the circle as an annotation that you're dealing with carbon.2. Determine how many protons and electrons you'll need to draw. The amount of electrons in an atom is tied to the amount of protons. However many protons
Topic : Radioactivity: What Causes It?
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169
Medical Entrance
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NEET
The Four Different Types of Metals and Their Contribution to MetallurgyBy Maria Veronica BuenaventuraThe earth is indeed an amazing and perfect place to live. It has the things that are necessary for us to survive. It provides with the enough resources for our needs. There is no place like earth. Humans are the highest level of organism living on this planet. We are even termed as the stewards of this place. Although plants and animals are also considered as living organisms, humans are given the chance and the will to utilize the natural resources that can be found on earth.These natural resources include plants, wood and minerals. Metal is one of the oldest minera
Topic : What is Electrochemistry?
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175
Medical Entrance
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NEET
Electrochemistry, the branch of chemistry concerned with the relationship between electricity and chemical changes. It deals both with chemical reactions that produce electricity and with the application of electricity to produce chemical reactions. The production of chemical changes in a substance by passing an electric current through it is called electrolysis.An electric battery is able to produce an electric current because of the electrochemical reactions that take place within it. Electrolysis is used in a variety of industrial processes, including electroplating, the extraction of metals from ores, the refining of metals, and the production of such elements a
Topic : How to Solve Chemistry Equilibrium Problems
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166
Medical Entrance
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NEET
Equilibrium questions relate to a process-specific equilibrium constant (Keq). At any point, a reaction has a reaction quotient that compares the ratio of products to reactants to what that ratio is at equilibrium. Set up an "ICE" table with proper variable placement. Use the table to provide expressions applicable to equilibrium constant calculations. Given or measured data can then be used to solve for the unknown variable.1. Define reaction quotient (Q) for a given process. At equilibrium, Keq = Q. Reactions proceed towards more products if Q < Keq, or "back" toward more reactants if Q > Keq. The general chemical process aW + bX <--&g
Topic : Ionic equilibrium
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508
JEE Main
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JEE Main & Advanced
This chapter is easily one of the trickiest in the JEE syllabus. The usual formulas of (H+) = root over Ka.C is extremely dangerous indeed. One good method of ensuring that you do not blindly apply the wrong formula is by checking alpha = root over Ka/C. If alpha << 1, then only can the above formula for H+ conc. be applied.The safest way to proceed, in my opinion, is to use the two basic formulas of Ka = (H+)(A-)/(HA) and Kw = (H+)(OH-) rather than using rote-learned formulas. In JEE, only these formulas are without any highly binding assumptions and can be used freely. Remember, JEE, unlike other exams, tests your concepts rather than formulas. PLEASE L
Topic : properties of gases
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433
Engineering Entrance
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JEE Main
A gas is a form of matter that fills any container it occupies.2. An equation of state interrelates pressure, volume,temperature, and amount of substance: p = f(T,V,n).3. The pressure is the force divided by the area to which the forceis applied. The standard pressure is p7 = 1 bar (105 Pa).4. Mechanical equilibrium is the condition of equality ofpressure on either side of a movable wall.5. Temperature is the property that indicates the direction of theflow of energy through a thermally conducting, rigid wall.6. A diathermic boundary is a boundary that permits the passageof energy as heat. An adiabatic boundary is a boundary thatprevents the passage of energy
Topic : Hello chemist.....are u confused abt optical isomers......
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331
Engineering Entrance
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Medical Entrance
Hello chemist.....are u confused abt optical isomers...... Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes;
Topic : slide-show for MOLE CONCEPT.....plz see this.. u will love it.........................
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1130
Engineering Entrance
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JEE Main
Topic : PHYSICAL CHEMISTRY e-BOOK PW ATKINS AND MANY OTHER..
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Engineering Entrance
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JEE Main
Someone requested in comment for physical Chemistry bookso I am giving live linksize 3.3mb pdf filelink: http://rapidshare.com/files/120772841/physical_chemistry_-_atkins___paula.pdf
Topic : Tips for Chemical Kinetics
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467
Engineering Entrance
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JEE Main
Never use word: 'faster the rate of reaction' or 'slower the rate of reaction'. (Use word such as 'increases', 'decreases', 'higher' or 'lower'). Average rate of reaction is different from instantaneous rate of reaction. (Instantaneous can be determined by drawing a tangent on the graph's curve). Remember that rate of a reaction is always expressed as a positive value. Practically all radioactive transformations are first order reactions. Changing temperature changes the reaction rate. Adding a catalyst (usuall
Topic : Modern Einstein Theory of Relativity
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820
Engineering Entrance
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GATE
Einstein's Theory of Relativity states that , "Agar ek ladke ke haath par kisi ladki ka haath ho to ek ghanta bhi ek minute ki tarah guzarta hai aur agar ek haath ek garam tave pe rakha ho to ek minute bhi ek ghanta ke barabar guzarta hai. "Best Explanation of Albert Einstein's Special Theory of Relativity rate if you like
Topic : Toughest Problems in The world(must have a look)
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860
Engineering Entrance
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JEE Main
Source Wikipedia.Don't forget to click like if you find it interestingMillennium Prize ProblemsFrom Wikipedia, the free encyclopedia This article is about the math prizes. For the technology prize, see Millennium Technology Prize.The seven problems are:The Millennium Prize Problems are seven problems in mathematics that were stated by theClay Mathematics Institute in 2000. As of March 2012, six of the problems remain unsolved. A correct solution to any of the problems results in a US$1,000,000 prize (sometimes called aMillennium Prize) being awarded by the institute. The Poincaré conjecture, the onl
Topic : A new trick for Bond Angle
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Engineering Entrance
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JEE Main
Hello guys ...this is my second article ...(Academic) ....Actually I am submitting this...because there is one question always in JEE, AIEEE or BITSAT...or any State Engineering Exam...on this topic....so make yourself comfortable ....and understand this...This method is applicable only for element N O P (mean Nitrogen Oxygen and Phosphorus )...........Trick is :- If central Atom is same ....then Higher the Electronegativity of Surrounding atom...lower the bond Angle ...and vice-versa If Surrounding Atom is same...then Lower the Electronegativity of Central atom Lower the bond angle and vice-versaExample ;NF3 NCl3 NBr3 NI3 Central atom is sam
Topic : Bohr's Model of Atom
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1033
Engineering Entrance
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JEE Main
Hey this is a completely self written article, comment or like below..This article investigates the three postulates of Bohr Model of atom and explains why they are important from the point of view of the development of atomic physics and the atomic structure.Bohr's Postulates1.) The electron revolves around the nucleus in only certain orbits at certain fixed distances from the nucleus.."This isn't how two charges are supposed to behave if we assume Coulomb's Law to be valid(classical electromagneticapproach).According to it, two charges can be allowed to be placed as much apart we wish. In short, Coulomb's Law doesn't
Topic : Relationship between bond length,order,strength,angle
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383
Engineering Entrance
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Medical Entrance
Can someone please explain me the relationship between these?Thanks
Topic : just a simple check of your ability
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1214
Engineering Entrance
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JEE Main
In chemistry we study dil.solution.in this chapter when we study osmotic pressure we use this formula (pie*V=nRT) but this is only the gas equation PV=nRTjust pie in place of V.so, i want you to answer that it is the formula of gas and we are using it in solution .WhyKeep ThinkingSome of the Related Articles:IUPAC Nomenclature BasicsChemistry Objective Questions for Practice !How to Learn Periodic Tables in Minutes ??Success Mantra by JEE Toppers !
Topic : Chemistry
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516
Engineering Entrance
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Medical Entrance
How can remmember chemistry's reaction ---
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