Answer:
Solution III < Solution II < Solution I < Solution IV
Explanation:
I)
Due to the rate of neutralization is 1 mol of NaOH with 1 mol of HCl and that we have equal volumes of both solution with the same concentration, they neutralize each other leaving a neutral pH (pH=7). Althought, because your titrating agent is a base the equivalence point will be a bit alkaline.
II) The same as the point I) but now the titrating agent is the acid, the equivalence point will be neutral trending a bit to acid.
III) Given that we have one strong acid neutralizing a weak base solution, in the equivalence point the the pH will be acid because the HCl (strong) dissociates compleately so we will have the 0.01 mol (100 ml of 0.1 M) of HCl with 0.01 mol>CH3NH2 (because is a weak base). How much less than 0.01 mol we have? <u>It depends of the strengh of the base and the pH will also depend on that</u>.
IV) This case is similar to the last one but with a strong base and a weak acid. So with a similar deduction the pH in the equivalence point will be alkaline (pH>7). How much? It depends on the strengh of the acid.
<u>In order of increasing pH: </u>
Solution III < Solution II < Solution I < Solution IV
The microscopic interface asymmetry of grown semiconductor heterostructures.
The dispersion of restricted electrons. beginning from a multiband envelope formulation we practice matrix perturbation theory to derive specific expressions. Interface asymmetry, which in the conduction band Hamiltonian appear as a warping and a spin-splitting term. The warping term consequences in an inequivalence of the dispersion.
The microscopic interface asymmetry of grown semiconductor heterostructures that gives upward thrust to heavy-light hole coupling even at 0 in-plane wave vector, modifies also the dispersion of restricted electrons. beginning from a multiband envelope method we practice matrix perturbation principle to derive explicit expressions as a result of this interface asymmetry, which inside the conduction band.
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Answer:
C
Explanation:
Neon is a noble gas, which is monoatomic.
Answer:
12.5 moles
Explanation:
Given parameters:
Number of moles of FeS = 12.5moles
Unknown:
Number of moles of sulfur needed = ?
Solution:
We have to solve from the known to the unknown using a balanced chemical equation at first.
The balanced chemical equation for this reaction is:
Fe + S → FeS
The reaction is made possible when iron is heated in the presence of sulfur.
we see that;
1 mole of sulfur produced 1 mole of FeS
x mole of sulfur will produce 12.5moles of iron sulfide;
Therefore, 12.5 moles of sulfur will produce that given amount of iron sulfide.