If you react 20, and 4H , how many atoms of hydrogen and how many atoms of oxygen will there be in the product?​

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Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

Answer two atoms of oxygen;