When sodium carbonate (na2co3) dissolves in water, it partially ionizes. the carbonate (co3-) ion takes up a hydrogen ion and forms hco3-. what type of substance is sodium carbonate? ! strong base weak acid strong base weak base

12. complete each of the following word equations for synthesis reactions. a. sodium + oxygen -> b. magnesium + fluorine -> 13. complete and balance the equations for the decomposition reactions. a. hgo -> [with the triangle heat symbol above the arrow] b. h2o(l) -> [with "electricity" written above the arrow]

11. phosphorus-32 is radioactive and has a half life of 14 days. how much of a 124 mg sample of phosphorus-32 is present after 56 days? a) 7.75 mg b) 15.5 mg c) 31.0 mg d) 62.0 mg

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?