What kind of an element is the element described in problem 25? (its atomic mass is 3 times that of oxygen.)
gas
non-metal
metal
rare earth
radioactive

Sodium sulfate dissolves as follows: na2so4(s) → 2na+(aq) + so42- (aq). how many moles of na2so4 are required to make 1.0 l of solution in which the na concentration is 0.10 m?

What type of reaction fuels the processes seen here?

8. what happens to matter during a chemical reaction