# chemistry

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The question I am having trouble with is:

Scientists originally were uncertain whether the oxygen gas produced during photosynthesis came from CO2, H2O, or from both. How could radioisotope tracers be used to settle that question?

Chemistry - DrBob222

6CO2 + 6H2O ==> C6H12O6 + 6O2
Make O in CO2 radioactive; see where the radioactive O is at the end.
Make O in H2O radioactive; see where the radioactive O is at the end.

I'm sorry DrBob, I still don't understand what I am supposed to do. I wrote out the equations, but when you say to make the certain elements reactive, I'm not sure what you mean. Thank you for helping me!

• chemistry -

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The question I am having trouble with is: Scientists originally were uncertain whether the oxygen gas produced during photosynthesis came from CO2, H2O, or from both. How could radioisotope tracers be used to settle that question?

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