It is important to use low flame when evaporating water from a recovered filtrate because then the water and filtrate will not spatter and the filtrate can also be recovered after evaporating water.
If flame is not low then water as well as got spatter so it is important to use low flame so that the water and filtrate will not spatter.
Answer:
[CO₂] = [NO] ≈ 0.11 mol/dm³
[CO] = 0.25 mol/(25 L) = 0.01 mol/dm³
[NO₂] = 0.45 mol/(25 L) = 0.018 mol/dm³
Explanation:
The number of moles of CO = 0.25 moles
The number of moles of NO₂ = 0045 moles
The temperature of the vessel = 350°C
The equilibrium constant, Kc = 67.5
We have;
The product of the the concentration of the products = Kc × The product of the concentration of the reactants, therefore;
[CO₂] × [NO] = 67.5 ×(0.25/25 × 0.45/25) = 0.01215
Given that [CO₂] = [NO], we get;
[CO₂] = [NO] = √0.01215 ≈ 0.11 mol/dm³
[CO] = 0.25 mol/(25 L) = 0.01 mol/dm³
[NO₂] = 0.45 mol/(25 L) = 0.018 mol/dm³
Answer:
D.A high temperature will make it spontaneous.
Explanation:
we know that
Δ G = Δ H - TΔS
For spontaneous reaction
Δ G should be negative . If Δ G = 0
Δ H = TΔS
T = Δ H / Δ S
At temperature above this T , Δ G becomes negative if Δ S and ΔH are positive .
So at a high temperature will make it spontaneous.
Explanation:
a) The presence of sulfate ions in a solution can be confirmed by the reaction of barium chloride in an acidic medium.
The balanced chemical equation of the reaction is shown below:
Hence, the white precipitate is barium sulfate and its formation with the ionic equation is shown below:
b) The presence of copper (II) ions can be confirmed by the following test:
Add potassium iodide solution to copper (II) solution.
Then a white ppt of cuprous iodide along with the liberation of iodine is observed and the entire solution attains brown color.
The chemical equation of the reaction is shown below:
c)(i)Due to this reaction, the blue color of the solution becomes white.
Reddish-brown copper is deposited at the bottom of the container.
(ii)In this reaction, zinc is oxidized.
d) (i) Copper is produced at the cathode.
(ii)
(iii) The reaction that takes place at the cathode is reduction.
Reduction is gaining of electrons.
Physiological pH is between 7.37 and 7.43
Lysine is a basic amino acid, which means
it has two NH2 groups and one COOH group.
Lysine pKas are: 2.16, 9.06 and 10.05
At low pH (lower than the first pKa, in
this case: lower than 2.16) the three groups are protoned. As you increase pH,
the first group to lose its proton is the acid group, then the alpha-amino
group and then the R-amino group. You will have everything non protoned at a
high pH (higher than the highest pKa, in this case: 10.05).
Physiological pH is higher than the lowest
pKa and lower than the middle pKa, so it’s the second case: the acid is
not protoned, the R-amino is protoned and the alpha amino is protoned.
Protoned aminos are cations: NH3+.