A)In a chemical reaction two gases combine to form a solid. What do you expect for the sign of ΔS?

B) For which of the following processes does the entropy of the system increase? (Select all that apply.)

-> alignment of iron filings in a magnetic field

-> the melting of ice cubes at 10°C and 1 atm pressure

-> the dissolution of HCl(g) in water to form concentrated hydrochloric acid

-> the reaction of hydrogen gas with oxygen gas to form water vapor

->separating a mixture of N2 and O2 into two separate samples, one that is pure N2 and one that is pure O2

4 answers

A)In a chemical reaction two gases combine to form a solid. What do you expect for the sign of ΔS?
S is higher in gases than solids

B) For which of the following processes does the entropy of the system increase? (Select all that apply.)

-> alignment of iron filings in a magnetic field
S is higher before alignment

-> the melting of ice cubes at 10°C and 1 atm pressure
S is higher in liquids than in solids

-> the dissolution of HCl(g) in water to form concentrated hydrochloric acid
S is higher in gases than in liquids

-> the reaction of hydrogen gas with oxygen gas to form water vapor
S is higher in gases than in liquids.
->separating a mixture of N2 and O2 into two separate samples, one that is pure N2 and one that is pure O2
dS increases if pure N2 and pure O2 are mixed.
thanx!!
A,E INCREASES
B,C,D DECREASES