Description : Which of the following is correct? (a) Curved arrows are always drawn from an electron poor center to an electron rich center. (b) A doubled headed arrow means one electron has been moved. (c) ... rich center to an electron poor center. (d) A single headed arrow means two electrons have been moved
Last Answer : Curved arrows are always drawn from an electron rich center to an electron poor center.
Description : Organic Chemistry: E2 reaction mechanism?
Last Answer : potassium tert-butoxide is a strong and exceptionally hindered base and therefore is only capable of abstracting primary (terminal) hydrogens in non-cyclic alkyl halides. The E2 mechanism is concerted, so there are no rearrangements.
Description : Read the following statements and choose the correct rect option. (A) Only a point source forms a complete umbra. (B) An extended source of light form
Last Answer : Read the following statements and choose the correct rect option. (A) Only a point source forms a complete ... B are true D. Both A and B are false
Description : (a) Show on a diagram the transfer of electrons between the atoms in the formation of MgO. Write symbols of cation and anion present in MgO. (b) Name the solvent in which ionic compounds are generally soluble. (c) Why are aqueous solutions of ionic compounds able to conduct electricity? -Chemistry
Last Answer : (b) Ionic compounds are soluble in water. (c) It is because aqueous solutions consist of ions which can move freely in them and carry current.
Description : (a) Show the formation of Na2O by the transfer of electrons between the combining atoms. (b) Why are ionic compounds usually hard? (c) How is it that ionic compounds in the solid state do not conduct electricity but they do so when in molten state? -Chemistry
Last Answer : (b) It is due to strong force of attraction between oppositely charged ions. (c) In solid state, ions are not free to move whereas in molten state ions are free to move, therefore, they conduct electricity in molten state.
Description : (a) Write electron dot diagram for chlorine (At No. 17) and calcium (At No. 20). Show the formation of calcium chloride by transfer of electrons. (b) Identify the nature of above compound’and explain three physical properties of such compound. -Chemistry
Last Answer : (b) It is ionic compound. Physical properties 1.It is hard and solid. 2.It has high melting and boiling point. 3.It soluble in water.
Description : In which of the branches of chemistry would the development of a theory about how a reaction takes place best be carried o w) analytical x) inorganic y) organic z) physical
Last Answer : ANSWER: Z -- PHYSICAL
Description : What does a “curved” arrow represent? (a) that two structures are resonance structures (b) the movement of two electrons (c) a link between reactants and products (d) that two structures are equivalent
Last Answer : the movement of two electrons
Description : A beam curved in plan is designed for (A) Bending moment and shear (B) Bending moment and torsion (C) Shear and torsion (D) Bending moment, shear and torsion
Last Answer : Answer: Option D
Description : What is shielding in NMR? A. Using a curved piece of metal to block an opponent’s attack B. Putting metal around an Rf source C. When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei D. Blocking parts of a molecule from Rf radiation
Last Answer : When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei
Description : Pick up the correct statement from the following: (A) With both handles in his left hand, the chain man throws out the chain with his right hand and the second chain man assists him to free it from ... the two chain men meet and the ten arrows are handed over to the leader (D) All the above
Last Answer : (D) All the above
Description : Select the correct statement. (A) Activity arrows in a CPM network are drawn to scale (B) The tail of an arrow represents the finish of an activity (C) Arrow bead represents the start of an activity (D) None of the above
Last Answer : (D) None of the above
Description : The first attempt to solve of mechanism of organic evolution was made by `:`
Last Answer : The first attempt to solve of mechanism of organic evolution was made by `:` A. Haeckel B. De Vries C. Lamarck D. Darwin
Description : Addition polymerisation takes place either by a free radical mechanism or ionic mechanism depending on the reagents used. Free radical polymerisation is catalyzed by __________, which decompose to give free radicals. (A) Organic peroxides (B) Sulphuric acid (C) Hydrofluoric acid (D) None of these
Last Answer : (A) Organic peroxides
Description : Which of the following factors does not govern the mechanism of petroleum formation from organic sources? (A) pH of the soil (B) Bacterial action (C) Heat (D) Pressure
Last Answer : (A) pH of the soil
Description : Two half-reactions of an electrochemical cell are given below : MnO-4 (aq) + 8H+ (aq) + 5e- → Mn2+ (aq) + 4H2O (I), E° = 1.51 V Sn2+ (aq) → Sn4+ (aq) + 2e- ... the redox equation from the standard potential of the cell and predict if the reaction is reactant favoured or product favoured. -Chemistry
Last Answer : The reactions can be represented at anode and at cathode in the following ways : At anode (oxidation) : Sn2+ → = Sn4+ (aq) + 2e- ] 5 E° = + 0.15 V At cathode (reduction) : MnO-4(aq) + 8H+ ... = E°cathode - E°anode = 1.51 - 0.15 = + 1.36 V ∴ Positive value of E°cell favours formation of product.
Description : Two half-reactions of an electrochemical cell are given below : MnO-4 (aq) + 8H+ (aq) + 5e- → Mn2+ (aq) + 4H2O (I), E° = 1.51 V Sn2+ (aq) → Sn4+ (aq) + ... -reactions and calculate the cell potential from the standard potentials and predict if the reaction is reactant or product favoured. -Chemistry
Last Answer : The reactions can be represented at anode and at cathode in the following ways : At anode (oxidation) : Sn2+ → Sn4+ (aq) + 2e- ] 5 E° = + 0.15 V Af cathode (reduction) : MnO-4(aq) + 8H+ ( ... = E°cathode - E°anode = 1.51 - 0.15 = + 1.36 V ∴ Positive value of E°cell favours formation of product.
Description : Write balanced equation for the reaction between magnesium and hydrochloric acid. Name the product obtained, identify the type of reaction. -Chemistry
Last Answer : Answer. The product formed is magnesium chloride and hydrogen gas. It is a displacement reaction.
Description : Write balanced equations for the reaction of: (i) aluminium when heated in air. Write the name of the product. (ii) iron with steam. Name the product obtained. (iii) calcium with water. Why does calcium start floating in water? -Chemistry
Last Answer : The bubbles of hydrogen stick to the surface of metal that is why it floats.
Description : Difference between Valency and Valence electrons ? -Chemistry
Last Answer : 1 ) Valency : The ability to gain, loose and sharing of electrons is valency / combinig capacity atoms of other elements is valency. 2 ) Valence elctrons : Electrons present in the outermost shell of the atom is valence electrons.
Description : Draw the atomic structure of (i) an atom with same number of sub-atomic particles, (ii) an atom with same number of electrons in L and M shell. -Chemistry 9th
Last Answer : (i) Oxygen Number of electrons = 8 Number of protons= 8 Number of neutron= 8 (ii) Argon Atomic number =18=2,8,8 No of electrons in L shell = 8 No of electrons in M shell = 8
Description : Do you know any online universities that offer organic chemistry?
Last Answer : Athabasca university.
Description : Where in the U.S. can I take a whole year of Organic Chemistry in one summer?
Last Answer : most colleges/universities in the U.S. offer multiple sessions of basic courses during summers, and also during what's called "intersession" which is a brief session that's offered immediately after the ... . especially as a med school pre-req could easily be completed during a summer. Good luck.
Description : What is the difference in the molecular formula of any two consecutive members of a homologous series of organic compounds? -Chemistry
Last Answer : —CH2— is the difference in the molecular formula of any two consecutive members of a homologous series of organic compounds.
Description : What is Organic Chemistry ?
Last Answer : Organic chemistry is a branch of chemistry that deals with the formation , properties , attachments, and synthesis of hydrocarbons and their derivatives .
Last Answer : : The branch of chemistry that deals with the chemistry of hydrocarbons and hydrocarbon species, i.e. structure , preparation , religion , identification, etc. , is called organic chemistry.
Last Answer : Organic chemistry is a branch of chemistry that deals with the formation , properties , attachment, and preparation or synthesis of hydrocarbons and hydrocarbon molecules.
Last Answer : Frederick Wheeler, father of organic chemistry
Description : Which is the best organic chemistry book?
Last Answer : There are so many good books for organic chemistry for Bsc. and Msc. level for example "Organic chemistry' 1- by Crame and Hamand, 2- by Robert and Cassirio, 3- by I.L, finar. for reaction mechanism is a book by Peter and Sykes.
Description : Father of Organic Chemistry?
Last Answer : Friedrich Wohler
Description : Write a note on the significance of organic chemistry.
Last Answer : Organic chemistry is used in biochemistry especially in the pharmaceutical industry and petro-chemistry. It is used as dyes, flavours, detergents, perfumes, cosmetics.
Description : What is organic chemistry?
Last Answer : Organic chemistry is the study of compounds and reactions involving carbon. OR It is the study of chemistry of carbon compounds of both natural and synthetic origin.
Description : Organic chemistry involves molecules that contain which element? a. carbon c. oxygen b. nitrogen d. calcium
Last Answer : a. carbon
Description : Which of the following conditions is to be satisfied both in elastic and plastic analyses? (a) Equilibrium condition (b) Yield condition (c ) Plastic moment condition (d) Mechanism condition
Last Answer : (a) Equilibrium condition
Description : The only CORRECT combination in which the reaction proceeds through radical mechanism is
Last Answer : The only CORRECT combination in which the reaction proceeds through radical mechanism is A. (IV)(i)(Q) B. (III)(ii)(P) C. (II)(iii)(R) D. (I)(ii)(R)
Description : Which one of the following statements concerning glucose metabolism is correct? (A) The conversion of Glucose to lactate occurs only in the R.B.C (B) Glucose enters most cells by a mechanism in ... ) An elevated level of insulin leads to a decreased level of fructose 2, 6-bisphosphate in hepatocyte
Last Answer : C
Description : Which one of the following statements regarding a catalyst is not correct? A An enzyme is a catalyst that only binds certain substrates. B An enzyme is a protein that is a highly ... increasing the activation energy. D Catalysts do not alter the equilibrium constant for a chemical reaction.
Last Answer : C Catalysts increase the rate of a reaction by altering the mechanism, thereby increasing the activation energy.
Description : Which of the following is not a correct statement about the electrophilic substitution mechanism of benzene? (a) Benzene functions as a nucleophile. (b) Formation of a carbocation intermediate is the ... hybridized carbon in the ring. (d) The addition product is a frequently observed minor product.
Last Answer : The addition product is a frequently observed minor product.
Description : When I was playing Cowboys and Indians, with my neighborhood friends, in the seventies, all our bullets and arrows hit their target. So I, until now, never really questioned the aiming a problem. Here's my question >>?
Last Answer : The single-bullet theory is fascinating to me. Let alone the accuracy. Thank goodness for the Zapruder Film. It still leaves questions. I am certain there have been many Cowboy and indian like shots fired from ... person. I think the precautions now are far to great for it to happen again in the US
Description : If you took an armour piercing bullet, and repurposed it as an arrowhead, how effective would that arrow be at armour penetration, compared to historical arrows with armour piercing arrow heads?
Last Answer : So the question is whether a bullet can be designed to travel at the velocity of an arrow and achieve the same or better penetrating power? I would think not, and the reason is that with ... bullet shells for arrowheads on shafts would augment the penetrating power of the arrow, I would think not.
Description : My up and down arrows on the right side of my computer screen have disappeared. How do I get them back?
Last Answer : answer:There was just a question about this in the last week so you are not alone. I'm going to dig for you since I think it had at least the cause and perhaps the solution. Edit: http://www. ... -back-on/ Not sure if that really helps. But at least you are not alone and that can be comforting.
Description : How to get the up and down scrolling arrows back on my PC?
Last Answer : I’m not following. But you could provide details that might help: what OS and what browser?
Description : How much damage can Cupid's bow do if he switched to regular bow and arrows?
Last Answer : I will get back to you, I’ll have to dig my Dieties and Demigods manual out of storage. I think Cupid was listed there as well as his bow.
Description : Any tips for finding lost arrows?
Last Answer : This may or may not work but i would say maybe insert or attach a small piece of aluminum (so as not to affect aerodynamics) and use a metal detector to pick them up. hope this help!
Description : What do you call the cross with arrows on each end image that comes on only when your cursor is within the screenshot you captured/trying to capture?
Last Answer : Please ignore the words “only”, and “trying to capture” in the Question.
Description : If cupid came and gave you a chance to get anyone you want with his love arrows, who would you choose and why?
Last Answer : Him, the guy next to him, and a whole team of Canadian ice hockey players.
Description : Where can I get more arrows in WOW?
Last Answer : Lol sure. I don’t think you can in the starting area. The next island will have a quest hub that will have a vendor to sell you ammo. You may also be able to track ammo vendors from the magnifying glass on your mini map.
Description : What does it mean when there are 2 arrows over a ship in spore?
Last Answer : Do you mean Spore the game???
Description : Have you heard of "Broken Arrows" or Reid Gershbein?
Last Answer : You can contact Reid through his website. link:“http://graphics.stanford.edu/~rsg/” or you can e-mail him at [email protected]
Description : Metal arrows sticking out of the ground?
Last Answer : Those are likely marking buried gas pipelines, and possibly (I'd need to see a picture) are a vent for the pipeline to keep any minor leaks from becoming explosions.