What is the reduction half-reaction for the following unbalanced redox equation?

cr2o2 2- + nh3 + → cr2o3 + n2

a. cr2o3 →cr2o72-

b. nh4+ → n2

c. n2 → nh4+

d. cr2o72- →cr2o3

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change. when the temperature in a room increases from 25°c to 33°c, changes from a solid to a liquid. in a lab, methane and nitrogen are cooled from -170°c to -200°c. the methane freezes and the nitrogen . when gold is heated to 2,856°c it changes from a liquid to a .

Displacement is the slope of a velocity vs. time graph a. true b. false

Select the most likely product for this reaction: koh(aq) + co2(g) – ? k2co3(aq) + h2o(1) k(s) + h2(g) + o2(g) k(s) + co3(9) +h2