Anyone down to start a convo

What volume of a 2.00 m stock solution of naoh is needed to prepare 150. ml of 0.40 m solution?

Which orbitals form a pi bond? a.the s orbital and three p orbitals b.the s orbital and two p orbitals c.overlapping p orbitals d.overlapping hybrid orbitals

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.