if there are 30 g of Np-240 present, how much will remain after 9 hrs. Np-240 has a half-life of 1.0 hr

What is avogadro’s number, and why is it useful

Long term exposure to waves can cause sunburns and skin cancer. a) visible b) infrared c) gamma rays d) ultraviole

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.