A person throws a 0.44-kg ball straight up into the air. It reaches a height of 9 m. What is the force on the ball as it begins to fall? (The acceleration due to
gravity is 9.81 m/s2)
A. 2.06 N
B. 2.48 N
C. 4.32 N
0 D. 1.18N

Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?

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.

Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship.