Which of the follow statements about isotopes is NOT correct? A- Isotopes are the same element but with different masses
B- Isotopes are often used for dating artifacts and fossils
C- Isotopes have different numbers of electrons
D- Isotopes are often radioactive

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.

Chemistry worksheet - i am not sure what they are asking for exactly?

Many ionic compounds and a few highly polar covalent compounds are because they completely ionize in water to create a solution filled with charged ions that can conduct an electric current.