Write the cell notation for an electrochemical cell consisting of an anode where Cr2^+(aq) is oxidized to Cr3^+(aq) at a platinum electrode and a cathode where Co2^+(aq) is reduced to Co(s) . Assume all aqueous solutions have a concentration of 1 mol/L and gases have a pressure of 1 bar.

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

What is the percentage composition of carbon in the compound ch4

What can be found in the ionosphere