5)Given the redox reaction in an electrochemical cell:
Ni(s) + Pb2+(aq) + Ni2+(aq) + Pb(s)
A salt bridge is used to connect
A) Ni(s) and Pb(s)
B) Pb2+(aq) and Ni2+(aq)
C) Ni(s) and Ni2+(aq)
D) Pb2+(aq) and Pb(s)

What is driving behind plate tectonics (plate movment)? a) gravity only b) inertia c) convection and gravity d) the sun theres no option for science so i picked chemistry. plz

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6