A sample of physical evidence was heated with dry cupric oxide. The issuing gas turned lime water milky. Which element does the physical evidence contain?

What is i fracture in the crust called when land move up, down or sideways

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.

Sulfuric acid is a polyprotic acid. write balanced chemical equations for the sequence of reactions that sulfuric acid can undergo when it's dissolved in water.