Cr2O72- + 6S2O32- + 14H+ —> 2Cr3+ + 3S4O62- + 7H2O ___ is reduced in the above reaction.

A. S2+

B. Cr6+

C. H+

D. O2-

What can be added to the examples section of each circle? endothermic: ice melting into water, and a heat pack becoming warm exothermic: a glow stick glowing, and fireworks exploding endothermic: ice melting into water, and an instant ice pack turning cold exothermic: fireworks exploding, and gasoline burning endothermic: a glow stick glowing, and a heat pack becoming warm exothermic: an instant ice pack turning cold, and ice melting into water endothermic: gasoline burning, and an instant ice pack turning cold exothermic: ice melting into water, and an instant ice pack turning cold

Using the periodic table, complete the table to describe each atom. type in your answers.a ? b? c? d? e? f?

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.