What does a buffer do? a)it maintains a neutral ph in a solution. b)it maintains an acidic ph in a solution. c)it maintain a constant ph in a solution. d)it maintain a basic ph in a solution.

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false

Explain in detail of the four major scientific developments that spurred the formulation of the plate tectonics theory

Which sample at stp has the same number of atoms as 18 liters of ne at stp