How many moles of carbon dioxide are produced in the reaction between hydrochloric acid and calcium carbonate when 2 moles of HCl are used to start with? 2HCl + CaCO3 +CaCl2 + CO2 + H2O
A. 2
B. 4
C. 1
D. 3

Describe the interaction that occurs between two objects with the same electrical charge.

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.

How does the value of the equilibrium constant show that a reaction reaches equilibrium very quickly? (a) the equilibrium constant is large. (b) the equilibrium constant is small. (c) the equilibrium constant is zero. (d) the value of the equilibrium constant does not show how quickly a reaction comes to equilibrium.