A doctor orders a blood sample from a child to test for traces of lead in the blood. Which of the following concentration units would best meet this need?
O grams per liter O molality
O percentage by mass
O parts per million

100 points answer quick the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

If you burn 46.6 g of hydrogen and produce 416 g of water, how much oxygen reacted