1) The half-life of Actinium-225 is 10days. If you began with a 60.Og sample of Actinium-225, what mass of the parent isotope (Ac) would remain at the end of the month (30 days)?
What’s the answer

In which of these cases are the two wave points considered to be in phase with each other?

What determines the average kinetic energy of the particles in a gas? a. the number of collisions b. the number of particles c. the size of the particles d. the temperature

Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. a solution containing 3.50 g of sodium carbonate is mixed with one containing 5.00 g of silver nitrate. how many grams of sodium carbonate, silver nitrate, silver carbonate, and sodium nitrate are present after the reaction is complete?