Chemistry, 10.10.2019 17:00 jennyrr9021
When did the level of oxygen in earth's atmosphere become high enough to sustain aerobic respiration? when did the level of oxygen in earth's atmosphere become high enough to sustain aerobic respiration? 3.5 billion years ago 1.5 billion years ago 2.7 billion years ago 1.0 billion years ago
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Chemistry, 22.06.2019 10:30
Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?
Answers: 3
Chemistry, 22.06.2019 12:30
Place the elements below in order of decreasing ionization energy. aluminum(al) chlorine(cl) magnesium (mg) sulfur(s)
Answers: 1
When did the level of oxygen in earth's atmosphere become high enough to sustain aerobic respiration...
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