Petroleum products such as gasoline are mostly made of carbon-based compounds. In what way is this an important clue about where petroleum products come from? Please help.

In salt water solution, the salt is the blank

Draw two cyclic constitutional isomers of cis-1

Which of the following is most likely true about water in chemical systems? a) water dissolves nonpolar ionic compounds. b) water dissociates ionic compounds. c) water dissociates covalent molecules. d) water dissolves nonpolar covalent substances.