Water is added to 215 mL of a 2.1 M solution of CaCl2 to increase the volume of the solution to 350. mL. What is the new concentration?

How are isotopes of the same chemical element alike? how are they different?

The arrangement of particles is most ordered in a sample of

Which change will decrease the number of effective collisions during a chemical reaction? a. adding a catalyst b. increasing the surface area c. decreasing the temperature d. increasing the reactant concentrations e. increasing the volume of the reactants