If the half-life of thorium-234 is 25 days how long would it take for thorium-234 to decay from 44g to 4.4g and why

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

Avolleyball player hit a ball with a mass of 0.25 kg. the average acceleration of the ball is 15.5 m/s². how much force did the volleyball player apply to the ball? 62.0 n 3.87 n 62.0 m/s² 3.87 m/s²

What volume does 1.70 ×10–3 mol of chlorine gas occupy if its temperature is 20.2 °c and its pressure is 795 mm hg?