In the reaction equation: Co(s) + 2 HCl(aq) → CoCl2(aq) + H2(g)

a. hydrogen is reduced
b. hydrogen is oxidized
c. chlorine is oxidized
d. cobalt is reduced

Calculate the change in entropy if br2(l) is converted to br2(g). s° for br2(l) = 152.2 j/(mol•k) s° for br2(g) = 245.5 j/(mol•k) s° for br(g) = 175.0 j/(mol•k)

8) a mixture of he, ne and ar has a pressure of 7.85 atm. if the ne has a mole fraction of 0.47 and 8) ar has a mole fraction of 0.23, what is the pressure of he? a) 4.2 atm b) 3.7 atm c) 5.5 atm d) 2.4 atm e) 1.8 atm

What produces wave a)sound b) heats c)transfer of energy d)vibrations