12. B
13. B
14.D
15. A.
16.C.
17. C
18.B
19.A.
Answer:
+2
Explanation:
Nickel (II) oxide, or NiO, is an ionic compound. Recalling a few rules of determining the oxidation number of substances:
1. Oxidation numbers of elements in ionic compounds are usually their own ionic charge
2. The total oxidation number of a neutral compound should be 0
And,
3. The oxidation number of oxygen in most cases is -2.
Therefore, since O in NiO has a oxidation number of -2, and nickel (II) ion usually has a charge of 2+, the oxidation number of Ni in NiO is +2 (always remember to put the positive sign in front of the number)
Hydroelectric energy is produced.
Use stoichometry to calculate this. In order to calculate this answer, you need to divide the grams by the molar mass of sodium bromide. The molar mass of sodium bromide is approximately 103 g/mol. 0.50/103 equates to about 0.00485 moles of sodium bromide.
An adiabatic process is one that involves no heat transfer. Work done is the relationship between work and the change in internal energy in an adiabatic process.
In the case of an adiabatic process heat transfer is zero ( Q = 0 ), so internal energy is equal to the Work done.
According to the 1st law of Thermodynamics;
Q= ΔU + W
In an adiabatic process: Q= 0
So,
ΔU= -W
The first law of thermodynamics with Q=0 shows that all the change in internal energy is in the form of workdone.
When we apply force "F" to a block, the body moves with some acceleration or, moreover, its speed increases or decreases depending on the direction of the force. The system's kinetic energy changes as speed increases or decreases.
Since we are aware that energy cannot be created or destroyed, it must be changed into another form. This perspective refers to it as completed job.
When negative energy is finished, the energy declines, and when positive energy is finished, the energy rises. Now that we understand how to assess work done,
To learn more work done brainly.com/question/13662169
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