What is a pure substance soda gasoline salt water or carbon dioxide

Soda and gasoline are definitely not a pure substance.

Carbon dioxide is the pure substance. Since it is a compound made up of only one kind of particle (co2) is a pure substance.

Salt water is not a pure substance. That is salt (nacl) with (h20).

I hope this helped!

Ch4 is nonpolar and insoluble in water. since all of the hydrogen atoms are evenly spread around the carbon atom even through the c h bond is polar all the poles cancel each other out.