1. Is energy absorbed or released when chemical bonds are broken during a chemical reaction?

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.

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.