The graph shows that the reaction is at equilibrium after 60. seconds because the concentrations of both no2(g) and n2o4(g) are

(1) increasing
(2) decreasing
(3) constant
(4) zero

State two physical properties of ionic compound

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.

Stage in which a typical star has completely stopped fusion