Question

Please help me need ASAP number 9 and 11 please

Answer 1

Answer:

Explanation:  9.  The sample has molecules larger than those of the liquid that did not pass through the filter paper.   Ions combined forming the precipitate, which is what the powder residue is.   In the liquid solution you had + aqueous ions and -aqueous ions.  Depending on the charges of those ions they combined in equal numbers.  For instance Na+1  would combine with Cl -1 and form salt.  Now the solution could have had more quantity of one ion than the other so some remained aqueous and went through the filter paper, and the rest combined with the limited reactant.  Not all combined at the time they were poured thorugh the filter paper and that's why a precipitate was found after the rest of the liquid of the solution evaporated.  Sometimes for atoms to combine a certain amount of energy must be placed in the system to get more of them to combine.  

11.  You can draw a container of gas that has H+ molecules floating and O2 molecules floating.  Under some type of pressure these can combine with two of the H+ atoms connnected to the diatomic oxygen molecule (which is O2 because there are two of them together in the gas form).  There must be energy added to the system this is in for the O2 to break apart to combine with two of the H+ gas to form H2O which is water.   But without that added energy it's just a container with the H+ dispersed among the O2 molecules.  I cannot draw on my program, sorry.  But just draw a box and have several of each mixed up in the box, but not attached to each other since it's not showing any energy put into the system.