These two substances are not the same. They are both green and they are both soluble in water. One substance has a melting point of 115 C, is soluble in alcohol, and has density of 1.88 g/cm 3 . The other substance breaks apart at 560 C, is not soluble in alcohol, and has density of 3.60 g/Cm 3. They have different properties. How could the explanation be improved?

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

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i would say b

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but i think i would need more information than that

that's what i got you can count the number of atoms