The amount of sodium-24 in a sample is found to have decreased from 10.0 grams to 1.25 grams in 45 hours. What is the half lite sodium -24?

1. 22.5 hours
2. 11.25 hours
3. 9.0 hours
4. 15.0 hours

Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount