Which group of lists below is made up of only pure substances? Homogeneous mixtures, heterogeneous mixtures, compounds

Analyze how limestone is weathered and identify the features that are formed as a result of this dissolution

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.

How many moles of bromine are needed to produce 3.23 moles of potassium bromide