Which element has the most metallic character, silicon sodium sulfur or thallium?

Is a pencil falling to the floor anon contact force, a force, or a contact force

State one important difference between a physical change and a chemical change?

You wish to prepare a buffer consisting of acetic acid and sodium acetate with a total acetic acetate plus acetate concentration of 250 mm and a ph of 5. what concentrations of acetic acid and sodium acetate should you use