Answer:The purpose of rice paddies is to grow rice in dry areas or areas that don't get that much rain. Also, they are used by using flooded water to grow.
Explanation:
Answer:
Explanation:
Assume that you have mixed 135 mL of 0.0147 mol·L⁻¹ NiCl₂ with 190 mL of 0.250 mol·L⁻¹ NH₃.
1. Moles of Ni²⁺
2. Moles of NH₃
3. Initial concentrations after mixing
(a) Total volume
V = 135 mL + 190 mL = 325 mL
(b) [Ni²⁺]
(c) [NH₃]
3. Equilibrium concentration of Ni²⁺
The reaction will reach the same equilibrium whether it approaches from the right or left.
Assume the reaction goes to completion.
Ni²⁺ + 6NH₃ ⇌ Ni(NH₃)₆²⁺
I/mol·L⁻¹: 6.106×10⁻³ 0.1462 0
C/mol·L⁻¹: -6.106×10⁻³ 0.1462-6×6.106×10⁻³ 0
E/mol·L⁻¹: 0 0.1095 6.106×10⁻³
Then we approach equilibrium from the right.
Ni²⁺ + 6NH₃ ⇌ Ni(NH₃)₆²⁺
I/mol·L⁻¹: 0 0.1095 6.106×10⁻³
C/mol·L⁻¹: +x +6x -x
E/mol·L⁻¹: x 0.1095+6x 6.106×10⁻³-x
![K_{\text{f}} = \dfrac{\text{[Ni(NH$_{3}$)$_{6}^{2+}$]}}{\text{[Ni$^{2+}$]}\text{[NH$_{3}$]}^{6}} = 2.0 \times 10^{8}](https://tex.z-dn.net/?f=K_%7B%5Ctext%7Bf%7D%7D%20%3D%20%5Cdfrac%7B%5Ctext%7B%5BNi%28NH%24_%7B3%7D%24%29%24_%7B6%7D%5E%7B2%2B%7D%24%5D%7D%7D%7B%5Ctext%7B%5BNi%24%5E%7B2%2B%7D%24%5D%7D%5Ctext%7B%5BNH%24_%7B3%7D%24%5D%7D%5E%7B6%7D%7D%20%3D%202.0%20%5Ctimes%2010%5E%7B8%7D)
Kf is large, so x ≪ 6.106×10⁻³. Then
![K_{\text{f}} = \dfrac{\text{[Ni(NH$_{3}$)$_{6}^{2+}$]}}{\text{[Ni$^{2+}$]}\text{[NH$_{3}$]}^{6}} = 2.0 \times 10^{8}\\\\\dfrac{6.106 \times 10^{-3}}{x\times 0.1095^{6}} = 2.0 \times 10^{8}\\\\6.106 \times 10^{-3} = 2.0 \times 10^{8}\times 0.1095^{6}x= 345.1x\\x= \dfrac{6.106 \times 10^{-3}}{345.1} = 1.77 \times 10^{-5}\\\\\text{The concentration of Ni$^{2+}$ at equilibrium is $\large \boxed{\mathbf{1.77 \times 10^{-5}}\textbf{ mol/L}}$}](https://tex.z-dn.net/?f=K_%7B%5Ctext%7Bf%7D%7D%20%3D%20%5Cdfrac%7B%5Ctext%7B%5BNi%28NH%24_%7B3%7D%24%29%24_%7B6%7D%5E%7B2%2B%7D%24%5D%7D%7D%7B%5Ctext%7B%5BNi%24%5E%7B2%2B%7D%24%5D%7D%5Ctext%7B%5BNH%24_%7B3%7D%24%5D%7D%5E%7B6%7D%7D%20%3D%202.0%20%5Ctimes%2010%5E%7B8%7D%5C%5C%5C%5C%5Cdfrac%7B6.106%20%5Ctimes%2010%5E%7B-3%7D%7D%7Bx%5Ctimes%200.1095%5E%7B6%7D%7D%20%3D%202.0%20%5Ctimes%2010%5E%7B8%7D%5C%5C%5C%5C6.106%20%5Ctimes%2010%5E%7B-3%7D%20%3D%202.0%20%5Ctimes%2010%5E%7B8%7D%5Ctimes%200.1095%5E%7B6%7Dx%3D%20345.1x%5C%5Cx%3D%20%5Cdfrac%7B6.106%20%5Ctimes%2010%5E%7B-3%7D%7D%7B345.1%7D%20%3D%201.77%20%5Ctimes%2010%5E%7B-5%7D%5C%5C%5C%5C%5Ctext%7BThe%20concentration%20of%20Ni%24%5E%7B2%2B%7D%24%20at%20equilibrium%20is%20%24%5Clarge%20%5Cboxed%7B%5Cmathbf%7B1.77%20%5Ctimes%2010%5E%7B-5%7D%7D%5Ctextbf%7B%20mol%2FL%7D%7D%24%7D)
Answer:
The correct option is d: carbon and oxygen.
Explanation:
The reaction between carbon and oxygen to form carbon dioxide is:
C + O₂ → CO₂ (1)
On the left side of the above reaction (1), we have the reactants, which are carbon (C) and oxygen (O₂) that react to form carbon dioxide (CO₂), which is the only product of the reaction (on the right side of the reaction).
Hence, the correct option is d: carbon and oxygen.
I hope it helps you!
1) This is a definition.
2) Protons are given by the bottom number (since atomic number = number of protons).
3) Neutrons = (mass number)-(atomic number), which are the top and bottom numbers, respectively.
4) Nuclear fusion involves combining two things together, which is only reflected by the last option.
5) This is a fact.
6) This is a fact.
7) This is a fact.
8) This is a fact.
9) The correct option is the explanation.
The Copernican revolution is about the model of the solar system and was given by a polish astronomer. Option C. The discovery that the universe was expanding.
The Copernican Revolution become the paradigm shift from the Ptolemaic model of the heavens, which described the cosmos as having Earth stationery on the center of the universe, to the heliocentric version with the solar on the center of the solar system.
Copernican Revolution, shift the subject of astronomy from a geocentric understanding of the universe, focused around Earth, to heliocentric knowledge, concentrated across the sun, as articulated by the Polish astronomer Nicolaus Copernicus.
This revolution changed the way of thinking of the solar system. Earlier it was thought that earth is in the center of the solar sysytem,i.e; people believed in the geocentric model, but according to Copernicus the solar system has the sun at the center and the remaining planets revolve around it i.e he believed in a heliocentric model.
Learn more about the Copernican revolution here:-brainly.com/question/11385060
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