Which statement describes a chemical reaction at equilibrium? (1) the products are completely consumed in the reaction.
(2) the reactants are completely consumed in the reaction.(3) the concentrations of the products and reactants are equal.(4) the concentrations of the products and reactants are constant.

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

What effect might melting sea ice have for people who live in coastal areas?

What is the percent by mass of oxygen in fe2o3