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

Question

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

Answer 1

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

Answer 2

dS increases if pure N2 and pure O2 are mixed.

Answer 3

thanx!!

Answer 4

A,E INCREASES
B,C,D DECREASES