Which statement is true about oxidation and reduction in an electrochemical cell?
(1) both occur at the anode.
(2) both occur at the cathode.
(3) oxidation occurs at the anode and reduction occurs at the cathode.
(4) oxidation occurs at the cathode and reduction occurs at the anode.

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth