Silicon is a popular semi-conductor. The process of doping either creates an excess or lack of electrons. In the case of silicon, the dopant is arsenic which has greater valence electron than silicon. Arsenic then donates an electron resulting to an excess of electrons. A new type or better type of semi-conductor is created. Silicon conduct greater electricity.
The best answer is the last option.
Fossil fuels have increased the amount of crops harvested.
Explanation:
Fossil fuels have greatly increased the amount of crops affected in the farming industry. Farm mechanization is the use of machinery for farm works.
- The bulk of machinery used on the farm are powered using fossil fuels obtained from organic matter of plants and animals.
- The internal combustion engines of farm machines is fueled using crude oil products.
- Tractors, harvesters, sprayers e.t.c used fossil fuels for their operations.
Learn more:
Fossil fuel brainly.com/question/9231468
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This question is more for Biology than Chemistry, but the role of producers is to make energy (food) to be consumed. In a pyramid diagram, the producers would be at the bottom. Now going up the pyramid, the primary conumers are the first to consume producers and obtain energy from them. As you go up the pyramid, the secondary consumers will consume the primary consumers as a way to obtain energy, and the same goes for tertiary consumers towards secondaries.
As you go up the energy pyramid, you will notice a trend that there is less energy being obtained from each consumer. In other words, the producers will ALWAYS have more energy than the tertiary consumers.
I hope this answers your question.
Explanation:
The given reaction will be as follows.
............. (1)
= ![[Ag^{+}][Cl^{-}] = 1.8 \times 10^{-10}](https://tex.z-dn.net/?f=%5BAg%5E%7B%2B%7D%5D%5BCl%5E%7B-%7D%5D%20%3D%201.8%20%5Ctimes%2010%5E%7B-10%7D)
Reaction for the complex formation is as follows.
![Ag^{+}(aq) + 2NH_{3}(aq) \rightleftharpoons [Ag(NH_{3})_{2}]^{+}(aq)](https://tex.z-dn.net/?f=Ag%5E%7B%2B%7D%28aq%29%20%2B%202NH_%7B3%7D%28aq%29%20%5Crightleftharpoons%20%5BAg%28NH_%7B3%7D%29_%7B2%7D%5D%5E%7B%2B%7D%28aq%29)
........... (2)
= ![\frac{[Ag(NH_{3})_{2}]}{[Ag^{+}][NH_{3}]^{2}} = 1.0 \times 10^{8}](https://tex.z-dn.net/?f=%5Cfrac%7B%5BAg%28NH_%7B3%7D%29_%7B2%7D%5D%7D%7B%5BAg%5E%7B%2B%7D%5D%5BNH_%7B3%7D%5D%5E%7B2%7D%7D%20%3D%201.0%20%5Ctimes%2010%5E%7B8%7D)
When we add both equations (1) and (2) then the resultant equation is as follows.
![AgCl(s) + 2NH_{3}(aq) \rightarrow [Ag(NH_{3})_{2}]^{+}(aq) + Cl^{-}(aq)](https://tex.z-dn.net/?f=AgCl%28s%29%20%2B%202NH_%7B3%7D%28aq%29%20%5Crightarrow%20%5BAg%28NH_%7B3%7D%29_%7B2%7D%5D%5E%7B%2B%7D%28aq%29%20%2B%20Cl%5E%7B-%7D%28aq%29)
............. (3)
Therefore, equilibrium constant will be as follows.
K = 
= 
= 
Since, we need 0.010 mol of AgCl to be soluble in 1 liter of solution after after addition of 
for complexation. This means we have to set
![[Ag^{+}]](https://tex.z-dn.net/?f=%5BAg%5E%7B%2B%7D%5D)
= ![[Cl^{-}]](https://tex.z-dn.net/?f=%5BCl%5E%7B-%7D%5D)
= 
= 0.010 M
For the net reaction,
Initial : 0.010 x 0 0
Change : -0.010 -0.020 +0.010 +0.010
Equilibrium : 0 x - 0.020 0.010 0.010
Hence, the equilibrium constant expression for this is as follows.
K = ![\frac{[Ag(NH_{3})^{+}_{2}][Cl^{-}]}{[NH_{3}]^{2}}](https://tex.z-dn.net/?f=%5Cfrac%7B%5BAg%28NH_%7B3%7D%29%5E%7B%2B%7D_%7B2%7D%5D%5BCl%5E%7B-%7D%5D%7D%7B%5BNH_%7B3%7D%5D%5E%7B2%7D%7D)
= 
x = 0.0945 mol
or, x = 0.095 mol (approx)
Thus, we can conclude that the number of moles of needed to be added is 0.095 mol.
Let's hope she didn't watch it without me or i will never be speaking to her again :))
