Chemistry, 05.11.2019 23:31 veronica25681
Pennies are made of zinc coated with copper. copper has a work function of 4.7 ev. the ozone layer blocks nearly all solar radiation with wavelength shorter than 320nm, but a very small amount of 200 nm light still manages to reach the earth's surface. can direct sunlight produce photoelectrons from a penny?
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Chemistry, 22.06.2019 06:30
Use examples from the article to explain one positive and one negative effect that chemistry has had on society.
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Chemistry, 22.06.2019 16:00
About 3% of the water on earth is freshest. only about 40% of that freshwater is available for human use. why is so much freshwater unavailable for human use?
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Pennies are made of zinc coated with copper. copper has a work function of 4.7 ev. the ozone layer b...
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