Be sure to answer all parts. write the overall, balanced molecular equation and indicate which element is oxidized and which is reduced for the following reactions. include phase abbreviations in the overall, balanced molecular equation. enter only the elemental symbol when identifying which element is oxidized or reduced. part 1 out of 2 (a) mg(s) cr(c2h3o2)3(aq)

What is a scientific theory? a. a scientist's guess about how something works b. the results of an experiment obtained using the scientific method c. a proven fact that will never change d. an idea that is backed by data from many sources

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

Calculate the number of molecules present in 0.750 mol of mgo.