Draw a lewis electron-dot diagram for a molecule of br2.

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?

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %

Give a real-world example of an energy transformation that uses two of the following forms of energy: chemical, mechanical, nuclear, gravitational, radiant, electrical, thermal (heat), and/or sound.