Why is a molecule of co2 nonpolar even though the bonds between the carbon atom and the oxygen atoms are polar?
(1) the shape of the co2 molecule is symmetrical.
(2) the shape of the co2 molecule is asymmetrical.
(3) the co2 molecule has a deficiency of electrons.
(4) the co2 molecule has an excess of electrons.

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