Give me an atom with the following characteristics: Lanthanide series
Boron
Chalogen
Alkaline Earth metal

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?

If two objects at different te,peraure are in contact with each other what happens to their temperature

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world