Which one of the following reations must occur by more than one reaction step? And why?
545577
H2(g)+ O3(g)=> H2O(L) + O2(g)\n\nBecause H2O is the prime factor of 02G if only 2H2 equals 2H20. If you take the "Smithy" equation into consideration and change the X into L factor, you will find that D is the correct answer!
677826
1) is already balanced... to be more precise\n2C2H6 + 7O2 --> 4 C02 + 6H2O\n\n2) Fe2O3 + (3)H2SO4 --> Fe2(SO4)3 + (3)H2O
101213
You may already know the answer, but I'll give you credit for wording it precisely.\n\nThe answer is more than one (on average), because neutron losses mean it would be impossible to sustain a critical nuclear reaction (that is, a constant rate of nuclear reactions) if you had one or less than one (on average) per reaction, since it takes at least one neutron to cause a nuclear reaction.\n\nThe exact reaction that occurs and the byproducts produced will determine exactly how many you get per individual reaction, but *on average* you need to net >1.0 neutrons per reaction.  The more losses you have (due to poor shielding, absorbant material, etc.), the higher the number needs to be, but something like 1.2-1.5 should be fine.
136146
The 1st answer is wrong. The reaction is\n\nNa2CO3(aq) + SrCl2 (aq)--> 2NaCl (aq) +SrCO3 (s)
502725
That second reaction should be Pb(s) + Cl2(g) ---> PbCl2(s).  Reverse the second reaction and then add the two together and you will get the resultant reaction.\n\nPbCl2(s) ---> Pb(s) + Cl2(g)    H = +359.4 kJ\nPb(s) + 2Cl2(g) ---> PbCl4(s)   H = -329.2 kJ\n\nPbCl2(s) + Cl2(g) ---> PbCl4(s)  H = +30.2 kJ
418418
Hopefully this diagram can answer your questions:\nhttp://fachschaft.cup.uni-muenchen.de/~schleifi/reaktion/reaction/stobbe.html
708100
Substrate Concentration: If all other conditions are held constant, the rate of the reaction should increase with increasing concentrations of substrate. At very low values of substrate the reaction rate will increase very rapidly. At higher substrate concentrations the rate begins to level off. Eventually the maximum rate for that reaction will be achieved and further increases in substrate concentration will have no effect\n\n\nHope this helps :)
946990
FeCl3 + NaCl -> FeCl2 + NaCl3\n\n\nFeCl3 + NaCl -> FeCl2 + NaCl3\n\nthese reactions are not possible \nas this reaction can take place if iron(fe) was more reactive than sodium or fe was less electropositive than na\nhence \nthese reactions are not possible
896144
A mechanism is considered to be proposed, because we can not look at the reaction and follow it in real time.  The reactants are molecules that are too small to see, and the reaction occurs too fast to watch it step by step.  A proposed mechanism accounts for all the observations, such as kinetics, intermediates, catalysts, etc., but can not ever be "proved".
544064
The two reagents are in aqueous form, which means that they exist in ions. Upon reaction, the H+ & OH- will form water, H2O & the remaining ions will remain aqueous in the solution;\n\nNaOH(aq) + HCl(aq) ----> NaCl(aq) + H2O(l)\n\nNo balance required...
827688
a) 2C2H6 + 7O2  --> 4CO2 + 6H2O\n\nb) C6H12 + 9O2  --> 6CO2 + 6H2O\n\nc) C5H12 + 8O2  --> 5CO2 + 6H2O\n\nYou must apply Markovnikov rule for the next addition reactions:\n\na) CH2=CHCH2CH3 + HCl  --> CH3CH(Cl)CH2CH3\n\nb) CH2=C(CH3)CH3 + HBr  --> CH3-CBr(CH3)CH3
262331
It all depends on what reaction you are asking about. Are you asking a question regarding the conversion of one molecule to another in a biological system or nuclear decay which is a chemical reaction or the oxidation of a piece of coal in a furnace. If you would specify the reaction involved, I might be able to help you.
37460
Positive synergy occurs when the sum of the effects of chemicals acting together is greater than the additive effects of the individual chemicals.  \n\n1 + 1 = more than 2
730330
Different chemical composition, one has a reaction the other doesn't..☺
485922
the minimum amount of energy required to start a reaction
766811
d. \n\nIt's a double replacement (acid/base) reaction.  The Sr and the H are both positive and they switch.  Since Sr has a 2+ charge and the PO4 has a 3- charge, you use a common multiple of 6.  The other product would be H(OH) or water.
899857
A solid that is formed by a chemical reaction.