The idea that the oldest rocks will always be the bottom layer of a series of rock layers is called the principle of
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Schrodinger and heisenberg developed an alternate theory about atomic nature that contradicted some of bohr's model of the atom. how do changes resulting from new technology and evidence affect the reputation of the atomic theory?

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?