PLEASE HELP ASAP! I WILL MARK AS BRAINLIEST

Question:
If 99.0% of the weak acid HX stays un-ionized in 1.0 M aqueous solution, what is the Ka?

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.

According to the diagram, what sources contribute to the phosphorus found in soil? according to the diagram, phosphorus found in soil contributes phosphorus to what other sources?

Once similarity and one difference between a mixture of elements and a mixture of compounds