Answer:
argon has an element structure of 2.8.8
1. Physical matter
2. Chemical matter
3. Physical matter
4. Physical matter
5. Chemical matter
6. Physical matter.
Answer:
Manganese decreases from 4+ to 2+ (reduced and oxidizing agent) and nitrogen increases from 2+ to 5+ (oxidized and reducing agent).
Explanation:
Hello there!
In this case, according to the given redox reaction, we rewrite it as a convenient first step:
![2NO + 3MnO_2 + 4H^+ \rightarrow 2NO_3^- + 3Mn^{2+} + 2H_2O](https://tex.z-dn.net/?f=2NO%20%2B%203MnO_2%20%2B%204H%5E%2B%20%5Crightarrow%202NO_3%5E-%20%2B%203Mn%5E%7B2%2B%7D%20%2B%202H_2O)
Next, we assign the oxidation numbers as follows:
![2N^{2+}O^{2-} + 3Mn^{4+}O^{-2}_2 + 4H^+ \rightarrow 2(N^{5+}O^{2-}_3)^- + 3Mn^{2+} + 2H^+_2O^{2-}](https://tex.z-dn.net/?f=2N%5E%7B2%2B%7DO%5E%7B2-%7D%20%2B%203Mn%5E%7B4%2B%7DO%5E%7B-2%7D_2%20%2B%204H%5E%2B%20%5Crightarrow%202%28N%5E%7B5%2B%7DO%5E%7B2-%7D_3%29%5E-%20%2B%203Mn%5E%7B2%2B%7D%20%2B%202H%5E%2B_2O%5E%7B2-%7D)
Thus, we can see that both manganese and nitrogen undergo a change in their oxidation number, the former decreases from 4+ to 2+ (reduced and oxidizing agent) and the latter increases from 2+ to 5+ (oxidized and reducing agent).
Regards!
An atom hopefully this helps
Answer: When a substance is pure, it is composed of one type of molecule. For example, table salt is only composed of (more or less) salt molecules, while seawater has water and salt molecules. A more complicated example of a non - pure substance is soil. It has many different types of nutrients and compounds.