Which scientist would best describe the motion of the earth?
Match each eon or era with the ap...
Chemistry, 10.04.2020 21:11 robert7248
Which scientist would best describe the motion of the earth?
Match each eon or era with the appropriate characteristic or event.
1. Hadean eon
current eon
2. Archean eon
sometimes called "Age of Mammals"
3. Proterozoic eon
3
buildup of oxygen; first eukaryotes
4. Phanerozoic eon
time of the dinosaurs
5. Paleozoic era
largest mass extinction in Earth's history
6. Mesozoic era
1
formation of the solar system
7. Cenozoic era
2
toxic atmosphere; first bacteria
Answers: 2
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Select the correct value for the indicated bond angle in each of the compounds. o−o−oo−o−o angle of o3 90° 109.5° < 109.5° 120° < 120° 180° f−b−ff−b−f angle of bf3 180° < 109.5° < 120° 120° 109.5° 90° f−o−ff−o−f angle of of2 < 120° 120° 90° 109.5° 180° < 109.5° cl−be−clcl−be−cl angle of becl2 90° 109.5° 180° 120° < 109.5° < 120° f−p−ff−p−f angle of pf3 90° 109.5° < 109.5° 180° 120° < 120° h−c−hh−c−h angle of ch4 90° < 109.5° 180° 120° < 120° 109.5°
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