The mass of an atom of element x is equivalent to the total mass of 7 hydrogen atoms

What does the cell nucleus do or, how does it function?

Compare and contrast physical changes with chemical changes.

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.