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Chemistry: Post your doubts here!
HELP PLEASE IONIC EQUILIBRIA QUESTION: Lake water contains dissolved sodium carbonate and sodium hydrogen carbonate. The following equilibrium exists: HCO3- (rev sign) H+ + CO32- [CO32-]/[HCO3-] = 0.958 When 10cm3 of lake water were titrated with 0.2mol/dm3 HCl, 22cm3 of acid were required... -
Questions from Chapter: Nitrogen and Sulfur
An acidic impurity is removed from the gaseous emissions of a coal-powered power station by passing them through an aqueous suspension of mineral followed by oxidation. which of the following combination satisfies these conditions? Acidic Impurity / Mineral / Oxidised... -
Physics: Post your doubts here!
for question 2b... ok, so final temperature is mpt of gold, which is 1340 also, 5% of mixture will be silver, so 95% will be gold formula used heat=mcdt, during change in state=mlf dT(change in temp)= (whatever very high temp of gold which we don't knw of) - 1340 the heat lost by the gold=the... -
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GP Notes Sharing :)
Also, just curious...do u live in mauritius? (i'm guessing from ur description) :P -
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Physics: Post your doubts here!
R=(pl)/A A=L^2 When A is substituted in 1st equation, R=p/l now V=l^3 l=(l^3)^(1/3) thus, l=V^(1/3) replacing this in 2nd equation... R=p/(V^(1/3)) answer C :D -
Physics: Post your doubts here!
The collision is perfectly elastic. hence, the relative speed of approach=relative speed of separation. Imagine 2 bodies of equal masses (B1 and B2) approaching each other...and on collision move away in opposite directions. if B1 moves 10 steps towards B2, and B2 moves 5 steps towards B1, then... -
Chemistry: Post your doubts here!
Fluoride and chloride ions won't reduce concentrated sulphuric acid, as they are not strong enough reducing agents. Bromide ions reduce the sulphuric acid to sulphur dioxide. In the process, the bromide ions are oxidised to bromine. Iodide ions reduce the sulphuric acid to a mixture of... -
Chemistry: Post your doubts here!
In the periodic table, there are diagonal relationships. This is when elements which are diagonal to each other possess similar properties. if u look in the periodic table, u will see that Be is diagonal to Al, the same way as Li is diagonal to Mg and B is diagonal to Si. There are several... -
Chemistry: Post your doubts here!
According to the equation, 2moles Fe3+ react with 2 moles I- so at equilibrium, [Fe3+]=[I-] hence [I-]= 2.0 × 10–4 mol dm–3 Also, according to equation, 2moles Fe2+ react with 1 mole I2 so at equilibrium [Fe2+]=2[I2] [Fe2+]=2×1.0 × 10–2 mol dm–3 =2.0 × 10–2 mol dm–3 Hope it helped :) -
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Chemistry: Post your doubts here!
Hi...plz help me with this question! Its been a week now n no one seems to be answering it :( -
Chemistry: Post your doubts here!
Firstly, acids produce hydrozonium ions(H3O+) not H+ ions. Let's take HCl as an example of an acid. HCl is strictly speaking - a polar covalent molecule with a partial positive charge on hydrogen and a partial negative charge on chlorine(due to different electronegativities). When this is... -
Chemistry: Post your doubts here!
Sidechains are basically what 'hang off ' the main body(a bit like the main trunk of the tree and its branches). if the diagram given in question is taken as an example, the upper side chain is CH3(CH2)3CH=...=CH(CH2)7(the first side chain from the top). middle side chain is one after the upper... -
Chemistry: Post your doubts here!
The question was already asked before on this thread...#1401. I'll write what smzimran wrote: -
Chemistry: Post your doubts here!
Hi guys, PLZ PLZ PLZ reply to my questions...its #6814 and #6815. thnx in advance :) -
Chemistry: Post your doubts here!
9. answer is B because nitric acid is HNO3. It dissociates in water to give 1H+ ion and 1 NO3- ion. It is the only one which dissociates to give 1 mole H+, like HCl(which dissociates to give 1 H+ and 1 Cl-) 10. answer is D. This is found in Equilibria chapter. You have to know le Chatelier’s... -
Chemistry: Post your doubts here!
the question asked for 'the most accurate value of Mr'. I is also said that the compound is gaseous. Hence, the most accurate value is given when gas is in ideal conditions, that is it is an ideal gas. This occurs as high temperature and low pressure. thus, C is correct answer -
Chemistry: Post your doubts here!
the diagram for glyceryl trieleostearate is given...plz write the full question WITH diagrams next time... http://2.bp.blogspot.com/-BvWESUAvwHw/Tea_fPjiS0I/AAAAAAAAAKE/DBmBo9gYuGM/s1600/glyceryl+trieleostearate.jpg Step 1: Count the hydrogen atoms in the side-chains. Upper side-chain and...