The half-life of protactinium-217 is 4.9 x 10-3s. How much of a 3.50 mg sample of 21791 Pa will remain after 1.00 second?

Which three statements represent the benefits of performing experiments using computer simulations?

If you need to add 27.50ml of a solution, which piece of glassware would you use to deliver this volume and explain how you would determine if the 27.50 ml was measured?

Assume that 13.5 g solid aluminum (al) react with hcl to produce solid aluminum chloride (alcl3) salt and gaseous hydrogen (h2) at standard temperature and pressure.