Answer:
C. effusion because there is a movement of a gas through a small opening into a larger volume
Explanation:
Effusion makes fluid/gas molecules move to the container with less pressure or larger volume. In diffusion, the movement should work two ways even though one side might receive more. But in effusion, the movement is rather one way.
This case shows how effusion work because its not the concentration that makes the balls moving to the bottom part of the container. No ball moving from bottom container to top either.
Answer:
in a body of 165 pounds, the iron content is 2993.707 mg
Explanation:
- % iron = 0.0040% = (mass iron / mass human) * 100
⇒ mass iron / mass human = 4 E-5
∴ mass human = 165 pounds
⇒ mass iron = 165 pounds * 4 E-5
⇒ mass iron = 6.6 E-3 pounds * ( 453.592 g/pound ) * ( 1000 mg/g )
⇒ mass iron = 2993.707 mg iron
Answer:
% = 11.11%
Explanation:
To get the %m/m of any solution we should use the following expression:
%m/m = m solute / m solution * 100
we have the mass of solute, but not the mass of solution, however this can be calculated. solution is made using solute and solvent so:
m solution = 25 + 200 = 225 g
Now that we have the mass of solution, we can calculate the %:
%m/m = 25 / 225 * 100
%m/m = 11.11%
This is the %m/m of this solution
Answer:
Here's what I get.
Explanation:
The frequency of a vibration depends on the strength of the bond (the force constant).
The stronger the bond, the more energy is needed for the vibration, so the frequency (f) and the wavenumber increase.
Acetophenone
Resonance interactions with the aromatic ring give the C=O bond in acetophenone a mix of single- and double-bond character, and the bond frequency = 1685 cm⁻¹.
p-Aminoacetophenone
The +R effect of the amino group increases the single-bond character of the C=O bond. The bond lengthens, so it becomes weaker.
The vibrational energy decreases, so wavenumber decreases to 1652 cm⁻¹.
p-Nitroacetophenone
The nitro group puts a partial positive charge on C-1. The -I effect withdraws electrons from the acetyl group.
As electron density moves toward C-1, the double bond character of the C=O group increases.
The bond length decreases, so the bond becomes stronger, and wavenumber increases to 1693 cm¹.