When solid surfaces slide over each other, the kind of friction that occurs is _ friction

During chemistry class, carl performed several lab tests on two white solids. the results of three tests are seen in the data table. based on this data, carl has concluded that substance b must have bonds.

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?

According to the tide table below what time of day will the highest tide occur? (2 pt) the highest tide will occur at