3 - Calcule a massa molar das substâncias relacionadas abaixo. Assinale a alternativa que corresponde a essas massas molares, respectivamente. Dados: Na=23; Cl=36; Ba=137; F=19; C=12; H=1; O=16. *

10. translate each of the following chemical equations into a sentence. a. 2 zns(s) + 3 o2(g) -> 2 zno(s) + 2 so2(g) b. cah2(s) + 2 h2o(l) -> ca(oh)2 (aq) + 2 h2(g)

Why do scientists look for patterns in the world? a. patterns can explain observations. b. patterns never change, no matter what. c. patterns are easy for scientists to detect. d. patterns are all the same, through all time.

What human activity increases beach erosion?