You have a solution that contains ni 2 and pb 2 ions. you wish to use selective precipitation to separate the ions. you have available at your lab 0.500 m solutions of na2co3 and naoh. which solution should you add to your solution to achieve the best separation of nickel(ii) and lead(ii) ions

*will mark you brainliest + 15 points ** why does the equilibrium of a system shift when the pressure is increased? a. to maximize the stress on the system b. to stop restoring equilibrium to the system c. to increase the total moles of gas in the system d. to decrease the total moles of gas in the system

What are transitions between a liquid and a solid called? identify which way they are transitioning

Which common material is an example of a polymer? (25 pts) a. steel b. plastic c. petroleum d. rubbing alcohol