27. using the information in parent-daughter material, which of the isotope pairs might be used to
determine the age of something that was once living?
a. c-14 & n-14
c. any of these could be used
b. k-40 & ar 40
d. u-235 & pb-206

There are main groups in the modern periodic table of elements

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.

Asample of air with a volume of 2.20m3 at a pressure of 105 kpa and a temperature of 30c is cooled to 10c and the pressure is reduced to 75.0 kpa. what is the new volume? 6.9 1.34 2.56 43.0 2.88