The equilibrium constant for the dissociation of hydrofluoric acid is 6.6 x 10-4. If 2M HF is allowed to reach equilibrium, what will be the concentration of the fluoride atom? HF(aq) <-> H+(aq) + F-(aq)

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

Which is true of a liquid? it has a definite volume but not a definite mass. it has a definite mass but not a definite volume. it has a definite volume but not a definite shape. it has a definite shape but not a definite volume.