True or false. As a wave travels through a given material its velocity changes.
2 answers:
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Answer:
Cu
Explanation:
We can use oxidation numbers to figure out what is happening with the electrons.
The oxidation number of Cu increases from 0 to +2 in Cu(NO₃)₂. The copper has gained two positive charges, so it has lost two electrons. It has been oxidized, so it is the reducing agent.
NO₃⁻ is wrong. The oxidation number of N decreases from +5 in NO₃⁻ to +4 in NO₂, so it has been reduced. It is the oxidizing agent.
Cu(NO₃)₂ and NO₂ are wrong. They are the products of the reaction. They cannot be either oxidizing or reducing agents in this reaction
Answer: 10.4
Explanation:
ph is just as follows:
So plugging in our concentration we get:
Then rounding to one decimal place takes us to pH = 10.4