Approximately what percentage of the earth's crust is composed of oxygen?
A) ≈ 5%
B) ≈ 40%
C) ≈ 50%
D) ≈ 75%
Correct Answer:
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Q64: An oxidizing agent that was used in
Q65: Most household bleaches act as
A)oxidizing agents.
B)reducing agents.
C)electron
Q66: A substance which lowers the activation energy
Q67: The chemical basis of converting light into
Q68: In a black-and-white photograph,the black area on
Q70: Oxidizing agents are often used
A)as antioxidants.
B)as antiseptics.
C)to
Q71: Which substance is a common oxidizing agent?
A)C
B)Na₂Cr₂O₇
C)N₂
D)K
Q72: Given their mode of action,antiseptics are generally
Q73: Which of the following is NOT true
Q74: In the reaction N₂ + 3 H₂
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