AP CHEMISTRY

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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

  • AP CHEMISTRY -

    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

  • AP CHEMISTRY -

    dS increases if pure N2 and pure O2 are mixed.

  • AP CHEMISTRY -

    thanx!!

  • AP CHEMISTRY -

    A,E INCREASES
    B,C,D DECREASES

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