What is the equilibrium constant expression for dissolving calcium carbonate in water?

What are fossils of organisms that existed over a wide area but only for a limited time period called?

Why is it incorrect to balance a chemical equation by changing the subscripts? explain.

According to the passage, which of these is true about gray water systems? a) gray water systems use plants that require less water. eliminate b) gray water systems require the use of less fossil fuels. c) gray water systems reduce the amount of fresh water used. d) gray water systems reduce the amount water used by shower heads.