An isotope of cesium (cesium-139) has a half-life of 31.5 years. If 1500 g of cesium-139 disintegrates over a period of 189 years, how many grams of cesium-139 would remain?

All forces cause motion? true or false

In vapor-liquid equilibrium in a binary mixture, both components are generally present in both phases. how many degrees of freedom are there for such a system? the reaction between nitrogen and hydrogen to form ammonia occurs in the gas phase. how many degrees of freedom are there for this system? steam and coal react at high temperatures to form hydrogen, carbon monoxide, carbon dioxide, and methane. the following reactions have been suggested as being involved in the chemical transformation:

Is a chemical message sent by another individual.