5.0g sample of mgcl2 may contain measurable amounts of other compounds as impurities. which of the following quantities is (are) needed to determine that the sample is pure mgcl2 ?

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

At stp, what is the volume of 1 mole of co2?

Displacement is the slope of a velocity vs. time graph a. true b. false