Group 1 elements (usually called alkali metals) are not very electronegative and have small ionization energies due to that. The reason why they are not very electronegative is that they really want to loose their one valence electron so that they can have a noble gas electron configuration (completed octet).
I hope this helps.
Explanation:
The given data is as follows.
Air is at
and 14.6 psia.
= 0.00015 ft, Flow rate, (Q) = 48000 
(a) Formula to calculate hydraulic radius
is as follows.

= 
=
ft
Formula for equivalent diameter is as follows.

=
=
ft
(b) Formula for velocity floe is as follows.
Q = VA
V = 
=
ft/min
= 24000 ft/min
(c) Formula to calculate Reynold's number is as follows.
= 
=
(as
and
= 0.0443 lb/ft. hr)
= 53742.66 hr/min
As 1 hr = 10 min. So, 
= 3224559.6
(d) Formula to calculate pressure drop
is as follows.

Putting the given values into the above formula as follows.

= 
= 6.238 
Answer:
Freezing and condensation
Explanation:
Because they are exothermic, they release energy
Answer: The correct answer is d. The rates of the forward and reverse reactions are equal.
Explanation:
During a reversible reaction, a reaction that can occur to both sides of the equation, the chemical equilibirum is a state when the rates of reaction forward and reverse are equal, this means that the reaction never stops, it keep happening, but the conversion and decomposition rates are the same, and not necessarily the concentrations of reactants and products are equal.
Therefore, the correct answer is d. The rates of the forward and reverse reactions are equal.