1. Which of the following is one impact that volcanoes had on the early earth?
A. Volcanoes had no impacts on planet earth but they are pretty and fun to learn about
B. Volcanoes released carbon dioxide into the atmosphere and this allowed for the evolution of oxygen-
breathing life forms
C. Volcanoes released oxygen into the atmosphere and this allowed for the evolution of oxygen-breathing
life forms
D. Volcanoes absorbed water vapor from the atmosphere and made the planet very dry and difficult to live
on
Answers: 2
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Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.
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What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?
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6) (a) calculate the absorbance of the solution if its concentration is 0.0278 m and its molar extinction coefficient is 35.9 l/(mol cm). the depth of the cell is 5 mm. (b) what is the %t? (7) calculate the absorbance of the solution if the transmitted light intensity is 70% of the initial light beam intensity
Answers: 1
1. Which of the following is one impact that volcanoes had on the early earth?
A. Volcanoes had no...
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