Can somebody tell me wether each of these is polar or non-polar?

Question

1. Na+1 + I-1
2. H+1 + H-1
2C+4 + O-2

Answer 1

The reactions or combinations from your given are:

1. Sodium Iodide which is polar
2. Hydrogen gas which is non-polar
3. Carbon Dioxide which in non-polar

Check your work by looking up the electronegativities of each atom and finding the difference once they are combined. If the difference is close to 0, then it is non-polar.

Answer 2

the first is polar and 2 and 3non polar CO2 is not polar because of the symmetry