Elecronegativity difference between H and S

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

If you add 5.00 ml of 0.100 m sodium hydroxide to 50.0 ml of acetate buffer that is 0.100 m in both acetic acid and sodium acetate, what is the ph of the resulting solution? acetic acid: ka = 1.8. x 10-5

Which substance is a steroid? cholesterol fatty acid monosaccharide trans fat