How many moles are represented by 250g of platinum

Which type of bonding involves the complete transfer of a valence electron from a less electrogrative atom to a more electronegative one

Using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 pb+2(aq) + 2cl -(aq). if the value of ksp was determined to be only 1.2 x 10-2: too much solid has dissolved. additional precipitate is forming. the solution is unsaturated. the ions are now combining to reduce their concentrations.

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?