Find the distance in Parsecs to alpha Centauri which has an annual parallax of .742 arcsec

Why are people not able to scuba dive in the deep part of the ocean

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

Consider the following reaction at equilibrium: c(s)+h2o(g)⇌co(g)+h2(g) predict whether the reaction will shift left, shift right, or remain unchanged upon each of the following disturbances. a) c is added to the reaction mixture. b) h2ois condensed and removed from the reaction mixture c) co is added to the reaction mixture d) h2 is removed from the reaction mixture.