A chemist is about to perform a titration by adding a base to an acid. What is the most important reason for using a base instead of water to rinse out the burette? to make sure the burette is not blocked to prevent any bacteria from growing in the burette to make sure the base will flow quickly though the burette to prevent dilution of the base, which may affect the results.

How are evaporation and sublimation similar? a both involve the formation of a gas. b both release energy to the surroundings. c both take place throughout a solid. d both take place at the surface of a liquid.

How do you know when a chemical reaction has occurred

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.