Chemistry for life sciences questions.

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#	Question
1	Given the Lewis symbols (Li=3, F=9,Mg=12, N=7, Al=13 and O=8) Using the Lewis symbols, show the reaction between Lithium and Fluorine Magnesium and Nitrogen Aluminium and Oxygen Short answers
2	Define the term lone pairs and give 2 examples. Short answers
3	Given the Lewis symbols (Li=3, F=9,Mg=12, N=7, Al=13 and O=8) Calculate the pH and pOH of; $2.3 imes 10^{-3} M HNO_{3}$ solution $0.040 ,M ,Ca(OH)_{2}$ solution Mathematical Calculation
4	Given the Lewis symbols (Li=3, F=9,Mg=12, N=7, Al=13 and O=8) The pH of 0.20 M of an acid (HCOOH) is 3.45. What is the $K_{a}$ of the acid? Mathematical Calculation
5	Show the oxidation number to all elements in the following equation; $Al(s)+H_{2}O(g) ightarrow Al_{2}O(s)+3H_{2}(g).$ Short answers

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