Answer: A, metals tend to have lower ionization energies than nonmetals
Explanation:
Got it right on the quiz
Half life of a radio-active material is refereed to the time required for reducing its activity to 50 %.
Now, when I-131 passes 1st half life, it's activity will reduce to half i.e. 50%
When, I-131 passes 2nd half life, activity of I-131 will be reduced to 25%
On passing, 3rd half-life, percent activity of the I-131 <span>remaining will be 12.5 %.</span>
Answer:
Now length of body diagonal of this cube = √3×√2×r =2.45r
Explanation:
a) length of body diagonal of this cube = √3×√2×r = 2.45 r
it can solved as following
length of body diagonal = √3a (where a is edge length of cube)
length of face diagonal = √2a
But length of face diagonal = 2r
Therefore a = 2r /√2 = √2×r
Now length of body diagonal of this cube = √3×√2×r
Explanation:
The pKa value of acetic acid is determined experimentally by plotting pH titration curve.
The hydrogen ion, H+ concentration can be determined by performing a pH titration of a weak acid with a strong base like NaOH etc.
Starting from the dissociation equation for the acid,
HA(aq) + OH-(aq) --> H3O+(aq) + A−(aq)
we obtain for the point of half equivalence (where half of the acid has reacted with the base):
[A−] = [HA].
From the equilibrium equation
it therefore follows that
pKa = pH.
Physical only because if i were to cut paper, it is still paper
