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when u break an N2 (N-N) molecule (bond energy), u will get 2 N atoms (zat's wat u need)..hey thnx this was where i got stuck: why didn't we take 2*+994 kJ/mol for N2??
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when u break an N2 (N-N) molecule (bond energy), u will get 2 N atoms (zat's wat u need)..hey thnx this was where i got stuck: why didn't we take 2*+994 kJ/mol for N2??
I'm sorry i mis-interpreted the statement. The third option is *The rate of backward reaction increases*! Ofcourse it does. The rate of both the forward and backward reactions increases. Yes, the equillibrium shifts to RHS but because particles are more closer now its easier for them to be converted to products and reactants at the same time. So The more the pressure, the higher the rate.
Just as i made the mistake, i'd like you to remember the difference b/w altering the reaction itself and the rate of reaction. The rate of reaction is independent of the moles etc. and can be increased by increasing temperature or pressure.
Hope this clarifies!
Cyanohydrins can be made from carbonyl compounds by generating CN–ions from HCN in the presence of a weak base.
In a similar reaction, –CH2CO2CH3 ions are generated from CH3CO2CH3 by strong bases. Which compound can be made from an aldehyde and CH3CO2CH3 in the presence of a strong base?
A CH3CH(OH)CO2CH3
B CH3CO2CH2CH(OH)CH3
C CH3CH2CH(OH)CH2CO2CH3
D (CH3)2C(OH)CH2CO2CH3
this question is taken from O/N 2009, paper 11/12.
I only know that A is impossible, but how about B,C,D? they only differ in the arrangement of the carbon and amount of carbon atoms.
any help is greatly appreciated, and a fast reply is needed. I'll be having a school test on Monday, and this question bothers me
Q3:For Q3, answer is B but I don't understand why D is wrong. Could someone explain and correct my facts?
For Q16, What does it mean when HCL has a negative enthalpy as oppose to HI positive enthalpy. What characteristic would it bring to HCL and HI?
Q18, I just plain don't know..
Would appreciate any help on explaining my 3 questions... thanks!
thank you! the explanation was very helpful.
Q3:
D is incorrect because: If you look by the fact of two elements with the same nucleon number, their mass are the same. As I remember, the mass of proton and neutron is considered to be equal. This is what I think. Correct me if I'm wrong. B is wrong, because: Atom, in fact, can be split into simpler parts. Atom consist of proton, neutron, and electron. Therefore, simpler parts of atom does exist (proton, neutron, electron).
I'll try to work out with the other questions..
Hey I wanted to ask, what are we supposed to study in the chemical periodicity part, like group 2 and nitrogen and sulphur?? Urgent please some one tell me
the least negative one goes fwd as it is more "feasible" than the more negative one.Quick question: In Electrochemistry (A2), if both of the reactions have negative electrode potential values, which one goes forward? The most negative or least negative?
Hello there, can anyone respond to these 3 questions on chemical energetics and explain the answer to me please:
(3) The standard enthalpy changes for two reactions are given by the following equations: [answer is D]
2Fe (s) + 3/2 O2(g) → Fe2O3 ▲H = -822 Kjmol-1 i)C(s) + 1/2 O2 (g) → CO (g) ▲H=-110 Kjmol-1 ii)What is the standard enthalpy change for the following reaction?
Fe2O3 (s) + 3C (s) → 2Fe (s) + 3CO (g)(A) -932 Kjmol-1
(B) -712 Kjmol-1
(C) -492 Kjmol-1
(D) +492 Kjmol-1
(E) +712 Kjmol-1
Quick question: In Electrochemistry (A2), if both of the reactions have negative electrode potential values, which one goes forward? The most negative or least negative?
Anytym buddySoldier313
Thanks mate!
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