Which of these is a property of acids?

1. they feel slippery.

2. they turn litmus paper blue.

3. they taste sour.

4. they typically contain an -oh group.

13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.