What minimum concentration of cl− is required to begin to precipitate pbcl2? for pbcl2, ksp=1.17×10−5?

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

Is a pencil falling to the floor anon contact force, a force, or a contact force

In a laboratory determination of the atomic weight of tin, a sample of tin is weighed in a crucible. nitric acid is added, and the reaction proceeds to give a hydrated tin(iv)oxide plus no2and h2o. the hydrated tin(iv)oxide is then heated strongly and reacts as follows: sno2.xh2o(s)sno2(s)+ xh2o(g)the sno2is finally cooled and weighed in the crucible. explain the effect on the calculated atomic weight of tin that would result from each of the following experimental errors: (a)considerable spattering occurs when the nitric acid is added to the tin.(b)the hydrated tin(iv)oxide is not heated sufficiently to change it completely to tin oxide.