Scientists have measured and recorded the average rainfall of an area over several years to see if there is a pattern. which kind of investigation does this best describe? a. controlled experiment b. systematic observation c. field study d. simulation

Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?

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.

Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. a solution containing 3.50 g of sodium carbonate is mixed with one containing 5.00 g of silver nitrate. how many grams of sodium carbonate, silver nitrate, silver carbonate, and sodium nitrate are present after the reaction is complete?