The safe drinking water act (sdwa) sets a limit for mercury-a toxin to the central nervous system-at 0.002 mg/l. water suppliers must periodically test their water to ensure that mercury levels do not exceed 0.002 mg/l. suppose water becomes contaminated with mercury at twice the legal limit (0.004 mg/l). part a how much of this water would have to be consumed to ingest 0.100 g of mercury?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

How many moles of al3+ ions are in 1.25 moles of al2o3

Some familiar products contain some of the same types of atoms. for instance, the chemical formula for baking soda is nahco 3. the chemical formula for liquid bleach is naclo, and the chemical formula for table salt is nacl. which choice best describes why these three products have some of the same types of atoms in common?