What does Le Châtelier's principle say about upsetting a system at equilibrium?
A. A system will go to completion if equilibrium conditions are
changed.
B. A system at equilibrium will stay at equilibrium even if conditions
are upset.
C. A system whose equilibrium has been upset will shift to restore
equilibrium.
D. A system will not be able to restore equilibrium if conditions are
changed.

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.

Which substance—wood or silver—is the better thermal conductor? a thermal conductor is a material that requires very little heat energy to change its temperature. explain your answer.