Students in chemistry course were asked the following question on a unit exam: "Draw a diagram representing an element using circles as atoms."
a. The following diagrams represent the two types of answers given by students. Which is the drawing best representation of an element? Explain.
b. imagines that the atom in drawing B had been removed from one of the substances used earlier.
i. List the codes of the substances that "drawing B" could have come from through physical separations?

I need more help with part b. plz

1) in saturated limewater, [h+ ]=3.98x10-13 m. a) find [oh]-/ b) what is the ph? / c) is the solution acidic, basic, or neutral? / 2) in butter, [h+ ]=6.0x10-7 m. a) find [oh]-/ b) what is the ph? / c) is the solution acidic, basic, or neutral? / 3) in peaches, [oh]=3.16x10-11 m a) find [h+ ]/ b) what is the ph? / c) is the solution acidic, basic, or neutral? / 4) during the course of the day, human saliva varies between being acidic and basic. if [oh]=3.16x10-8 m, a) find [h+ ]/ b) what is the ph? / c) is the solution acidic, basic, or neutral? /

The organism shown is a free-living one that is anchored to the bottom of ponds and streams during one stage of its life cycle what is the common name for the group to which this organism belong

Most metamorphosis processes take place