Answer:
Concentration of Flourine = 24.756%
Explanation:
Given that :
High-density polyethylene may be flourinated by inducing the random substitution of Flourine atoms for hydrogen.
the objective is to determine he concentration of Flourine (in wt%) that must be added if this substitution occurs for 12% of all the original hydrogen atoms.
At standard conditions , the atomic weight of the these compounds are as follows:
Carbon = 12.01 g/mol
Chlorine = 35.45 g/mol
Fluorine = 19.00 g/mol
Hydrogen = 1.008 g/mol
Oxygen = 16.00 g/mol
The chemical formula for polyethylene = (CH₂ - CH₂)ₙ
Therefore, for two carbons, there will be 4 hydrogens;
i.e
(CH₂ - CH₂)₂
( C₂H₄ - C₂H₄ )
Suppose the number of original hydrogen = 4moles
number of moles of Flourine F = 12% of 4
= 0.12 × 4
= 0.48 mol
∴ the number of remaining moles of Hydrogen is:
= 4 - 0.48
= 3.52 moles
number of moles of Carbon = 2 moles
∴ the mass of flourine F = number of moles of F × molar mass of F
= 0.48 × 19
= 9.12
The total mass of the compound now is = (0.48 × 19 ) + (3.52 × 1) + (2× 12)
= 9.12 + 3.52 + 24
= 36.64
Concentration of Flourine = (mass of flourine/total mass) × 100
Concentration of Flourine = (9.12/36.84 ) × 100
Concentration of Flourine = 0.24756 × 100
Concentration of Flourine = 24.756%
Explanation:
In a magnetic field, the radius of the charged particle is as follows.
r = 
where, m = mass, v = velocity
q = charge, B = magnetic field
Therefore, q will be calculated as follows.
q = 
= 
= 
= 
= +2e
Thus, we can conclude that the charge of the ionized atom is +2e.
The correct answer is
Energy of electrons depends on light’s frequency, not intensity.
As per photoelectric effect, if we incident a light on metal surface it will results into emission of electron from it
if we increase the number of photons the number of electrons will increase however if we increase the frequency the number of photons will not increase
While if we increase frequency the energy of electrons will increase as
Energy of photon = Work function of metal + kinetic energy of electrons
Answer:
B. Solvent
Explanation:
In osmosis, water always moves from low solute concentration to high solute concentration. SOLUTE NEVER MOVES AS IT CANNOT PASS THE SELECTIVELY PERMEABLE MEMBRANE. alot of caps but need to stress this concept cuz otherwise this concept gets very confusing
The activity series goes top to bottom, most active to least active elements, going: Li, K, Ba, Sr, Ca, Na, Mg, Mn, Zn, Fe, Cd, Co, Ni, Sn, Pb, H, Cu, Ag, Hg, Au.
Thus, your list of metals would go from most reactive to least reactive: Li, K, Mg, Zn, Fe, Cu, Au
