PLZ I NEED What do the visible properties of mixtures reveal about their molecular and atomic properties?

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.

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp