polonium-218 has a half-life of 3.0 minutes. a sample weighing 50.0g is stored on a laboratory shelf. How much of the isotope will remain after 15 minutes.

Balance this equation co2(g) + h2o (g) show that the balanced equation obeys the law if conversation of mass

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.

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal