It takes 700 million years for half of the amount of Uranium-235 originally in rock to turn into Lead. If a scientist measures that a sample is 6.25% Uranium-235 and 93.75% Lead, how old is the sample?

Why are gamma rays not affected by a magnet as they pass over it? gamma rays are composed of only energy. gamma rays do not have enough mass to be affected. gamma rays do not have the right electrical charge to be affected. gamma rays move too fast for anything to affect their pathway.

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

What’s the percent by mass of carbon in c10h14n2