Explanation:
Solution 86P
Here, we have to determine the amount of sodium hydroxide required to precipitate all of the Mg.
Mg2+(aq) +2 NaOH(aq) ------> Mg(OH)2 (s) + 2Na+(aq)
Therefore
Molar mass of NaOH =39.997 g/mol
Molar mass of Mg =24.305 g/mol
Thus,the conversion factors
g NaOH(aq)= mol NaOH(aq) = g Mg = mol Mg
Thus the amount of sodium hydroxide required
= 88.4 mg of Mg x x x x...
1) Atomic number of magnesium (Mg) is 12, it means that it has 12 protons and 12 electrons.
Electron configuration of magnesium atom: ₁₂Mg 1s² 2s² 2p⁶ 3s².
2) Atomic number of aluminium (Al) is 13, it means that it has 13 protons and 13 electrons., but if it lost one electron, it will have 12 electrons and 13 protons and become aluminium cation Al⁺.
Electron configuration of aluminium cation: ₁₃Al⁺ 1s² 2s² 2p⁶ 3s².
3) Atomic number of silicon (Si) is 14, it means that it has 14 protons and 14 electrons., but if it lost two electrons, it will have 12 electrons and 14 protons and become silicon cation Si²⁺.
Electron configuration of silicon cation: ₁₄Si²⁺ 1s² 2s² 2p⁶ 3s².
The KWL chart is a perfect model that could assist the student in the learning of science.
<h3>What the KWL chart?</h3>
The KWL chart is a perfect model that could assist the student in the learning of science. In this model, the student has to note down what he/she already knows about the experiment that is going to be performed. The notes in another column the wonders that he/she hopes to unravel during the course of the experiment and in the last column the student has to fill what he/she has learned after the experiment.
Having said that, if I want to leant about water, I already know that the molecules of water are in constant random motion according to the kinetic molecular theory so I write that down.
Secondly, I wonder how these water molecules actually move. If i drop a pollen grain i water and observe the zigzag motion of the pollen grain due to the bombardment of the water molecules, I can now write that I have learnt that the molecules of water move in a zig zag manner.
Learn more about KWL chart:brainly.com/question/14305234?
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Answer:
true tell me if i am right ok
Explanation: