The half-life of sodium-25 is 1.0 minute. Starting with 1 kg of this isotope, how

much will remain after half an hour?

Evaluate this exponential expression,8. (2 + 3)2 – 42

How many moles are in 123.0 grams of kclo4?

What energy conversion occurs when a sling shot is used to shoot a rock across the room? (2 points) question 2 options: 1) stored mechanical energy is converted to mechanical energy. 2) stored mechanical energy is converted to radiant energy. 3) gravitational energy is converted to radiant energy. 4) gravitational energy is converted to mechanical energy.