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brilliants [131]
3 years ago
7

The element oxygen, represented by the symbol O, is classified as A. a compound. B. a solution. C. a mixture. D. a pure substanc

e.
Chemistry
2 answers:
liraira [26]3 years ago
7 0

The correct answer is D. A pure substance

Explanation:

In chemistry and related fields, a pure substance refers to a homogeneous substance in any state (solid, gas, liquid) that has defined and consistent chemical properties. This category includes chemical elements that have not reacted with other elements and compounds (mix of two or more elements) that are homogeneous.

In the case of oxygen that is represented by the symbol O this is a pure chemical element, this implies this substance has not been mixed with others, in it, all atoms are similar or identical, and it has defined chemical properties. Therefore, oxygen can be classified as a pure substance because it is homogeneous in composition and chemical properties (Option D).

maw [93]3 years ago
4 0

Answer:

I am pretty sure the answer is either A or D. Hope this helps you!

Explanation:

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How many moles of H2O2 are needed to react with 1.07 moles of N2H4?
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Answer:

2.14 moles of H₂O₂ are required

Explanation:

Given data:

Number of moles of H₂O₂ required = ?

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Solution:

Chemical equation:

N₂H₄  +   2H₂O₂       →   N₂ +  4H₂O

now we will compare the moles of H₂O₂ and N₂H₄

                          N₂H₄     :      H₂O₂  

                            1           :        2

                            1.07      :         2×1.07 = 2.14 mol

                   

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