A solid precipitates from a solution, releasing heat as it does so.
a) yes
b) no

b) no

Explanation:

To determine if the change will be spontaneous in the given description.

When a solid precipitate from a solution, the liquid has been converted to solid. For this to happen, the application of heat energy occurs in that state. As a result, the reaction will be exothermic. In an exothermic reaction, heat is lost from the system. Thus Δ H is usually negative.

This state's entropy will also be negative since entropy measures the degree of disorder of a system.

ΔS = -ve

Let's recall that for a reaction to being spontaneous, ΔG must be negative and ΔG can be expressed by the equation ;

ΔG = ΔH - TΔS

ΔG = -ve - (+ve)×(-ve)

ΔG = -ve(2)

So since the negative is larger, we can determine that the reaction will not be spontaneous.

the cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b