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Chemistry: Post your doubts here!
They're saying that the compound reacts with Na to give a 3+ charged ion. Only OH and CO2H react with Na to give a 1+ charged ion, so there must be 3 functional groups, either CO2H or OH. When NaOH reacts, a compound with a 1+ charge is produced by CO2H only, not OH. That means there is only ONE... -
Chemistry: Post your doubts here!
Q. 11: Draw ICE charts for A, B, C and D. That is, initial moles, change in moles and equilibrium moles. For B, it'll be like this: -
Chemistry: Post your doubts here!
Q. 11 isn't an equilibrium question; it's the activation energy question. -
Chemistry: Post your doubts here!
I don't know how to explain it further. What part don't you understand? I'll explain from there. Ethyl propanoate is an ester and will get hydrolysed by NaOH. It'll give the sodium salt of the carboxylic acid and the alcohol. Find the molecular masses of those and then calculate the % by mass. -
Chemistry: Post your doubts here!
17. Find the number of moles of O2 and construct equations for the combustion of Ca and Mg. Find the moles of the metal and check mole ratios. 23. -
Chemistry: Post your doubts here!
The functional groups that react with Na are CO2H and OH, so three of any of these should be present in the compound. B and D are ruled out. NaOH will react with CO2H, so there should be 1 CO2H and 2 OH groups. -
Chemistry: Post your doubts here!
16. This is something you have to memorise. Cl2 + cold, dilute NaOH will give a ClO- ion (oxidation state = +3) and Cl2 + hot, concentrated NaOH will give a ClO3- ion (oxidation state = +5). 20. Find the molecular masses of the products of propyl propanoate. The find the % by mass of each... -
Chemistry: Post your doubts here!
21. The functional groups that react with Na are CO2H and OH, so three of any of these should be present in the compound. B and D are ruled out. NaOH will react with CO2H, so there should be 1 CO2H and 2 OH groups. 22. Find the molecular mass of the products of the hydrolysis of ethyl... -
Chemistry: Post your doubts here!
1. Just multiply the moles by Avogrado's constant. 40. The compound is an ester. When ester are hydrolysed with NaOH, the alcohol is given and the sodium salt of carboxylic acid is given. -
Chemistry: Post your doubts here!
6. pV=nRT. V=m/ρ. 15. Construct a balanced equation for the decomposition of CaCO3. Then use mole ratios. -
Chemistry: Post your doubts here!
11. They're asking why hydrazine doesn't burn SPONTANEOUSLY. Meaning, all by itself. Any reaction that isn't spontaneous is because it needs a large amount of energy for the reaction to start. 36. NaCl is a neutral salt, so the solution it gives will have a pH value of 7. MgCl2 is very slightly... -
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Chemistry: Post your doubts here!
وعليكم السلام 7 and 11: Draw ICE charts, i.e. initial moles, change in moles and equilibrium moles, for ALL the options (A, B, C and D). Then see which one has x + 2/x for its final moles. For example, 7 D: We divide the equilibrium moles by 2 because the question says that the final moles of R... -
Chemistry: Post your doubts here!
21. The functional groups that react with Na are CO2H and OH, so three of any of these should be present in the compound. B and D are ruled out. NaOH will react with CO2H, so there should be 1 CO2H and 2 OH groups. 28. The energy profile shows a reaction that has 2 steps, one endothermic and... -
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Chemistry: Post your doubts here!
For 5, use bonds broken - bonds formed. -
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PAPER 1 MAY/JUNE 2013 PHYSICS DOUBTS HERE
Use v=fxlambda to find f, and then use T=Lx (T=1/f).