Answer:
The correct answer is - option D. photosynthesis.
Explanation:
It is shown by the study that most of the atmospheric oxygen comes from the photosynthesis by plants as oxygen is the byproduct of the photosynthesis. Photosynthesis is the process that uses light energy, carbon dioxide, and water to produce food or glucose/sugar and release oxygen as the byproduct.
Many scientists believe that oceanic phytoplankton that releases oxygen by the photosynthesis process makes 80 to 85% of the total oxygen of the atmospheric oxygen.
Answer:
- <em>spontaneous in the reverse direction at all temperatures</em>
Explanation:
The parameter to predict the spontaneity of a reduction is the change in the free energy, ΔG.
This is how it works:
- If ΔG = 0, the system is in equilibrium
- If ΔG > 0, the reaction is non-spontaneous.
- If ΔG < 0, the reaction is spontaneous.
In brief, free energy's decrease tells that a reaction is spontaneous, while free energy's increase tells a reaction is nonspontaneous.
Now, take the definition of the free energy:
The conditions given in the statement are:
- <em>An endothermic reaction</em> ⇒ ΔH > 0 (positive)
- <em>A negative entropy change</em> ⇒ ΔS < 0 ⇒ TΔS < 0 (negative)
Replacing in the equation ΔG = ΔH - TΔS, you get:
- ΔG = positive - (negative) = positive + positive = positive.
Then, you conclude that <em>for an endothermic reaction with a negative entropy change, </em>the change in the free energy is positive, and so the reaction is nonspontaneous (at all temperatures) in the forward direction.
Since, the change in the reverse direction has opposite sign, you also conclude that <em><u>the reaction is spontaneous in the reverse direction at all temperatures.</u></em>
We could not use recycled water for drinking purposes. That is because it may cause us to get sick.
Mass, velocity, and acceleration. :) good luck
