The number of in a mass spectrum indicates the number of isotopes of an element A. Peaks
B. Signals
C. Lighter Ions
D. Heavier Ions

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

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?

Which process transfers heat from inside earth to its surface? convection currents in mantle pulling away of tectonic plates drawing in of tectonic plates convection currents in crust