Bobby and Jane dissolve 13.4 g of solid potassium iodide in water, then pour the solution into an excess of concentrated lead (II) nitrate. Jane carefully filters the resulting yellow precipitate from the solution and dries the solid overnight. The following day, Bobby finds the mass of the precipitate (which he knows to be pbl) to be 17.4 g. What is the percent yield of Bobby and Jane's reaction? 2KI + Pb(NO3)2 -- 2KNO3 + Pbl2

What type of scientific model does the flow chart represent? (a chart of the scientific process) a. conceptual b. mathematical c. physical d. virtual

Rocks, as they are compressed, begin forming mountains above the earth's surface when two continental plates converge. the continental crust increases in depth as the mountains grow above. the himalayan mountains formed at a convergent plate boundary in this manner. the rocks are smashed together causing them to due to the intense heat and pressure from the colliding plates and eventually forming rock. a) melt; igneous b) layer; sedimentary c) recrystallize; metamorphic d) melt into the earth's interior; metamorphic

Arectangle has a diagonal 20 inches long that forms angles of 60 and 30 with the sides. find the perimeter of the rectangle. for geometry