Which reaction would occur at the anode in a voltaic cell? Mg(s)→Mg2++2e−

Cd2+(aq)+Zn(s)→Zn2+(aq)+Cd(s)

K+(aq)+e−→K(s)

Cu2(aq)+2e−→Cu(s)

Select the correct text in the passage. which sentences describe examples of sustainable living? i live in an old apartment building downtown, but my company is based in an office park on the outskirts of the city. i drive an old car that needs to be replaced. i plan to buy a hybrid for better gas mileage, but for now i am able to carpool with a couple of friends from work. the drive to the office park is about 45 minutes each way, but we do get to work in a modern building. the architects just received a leed certification for the design.

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.

When the ionic compound nabr dissolves in water, br– ions are pulled into solution by the attraction between what two particles? a. the na+ and br– ions b. the na+ ion and the negative end of a water molecule c. the br– ion and the positive end of a water molecule d. the br– ion and the negative end of a water molecule