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Unformatted text preview: passing. How does this work? (3) 3. Which compounds do the alkali metals lithium and sodium form when they burn in air? Draw the Lewis structures of the respective anions. (2) 4. Draw the structures of the the cryptands [2.1.1] and [2.2.2]. Which one of these is likely to have the larger binding constant for the coordination of potassium ions. Why? (2) 5. Bonus question. An aquaporin protein consists of approximately 200 amino acids. Find or deduce the formula that lets you calculate the number of possible combinations of 20 amino acids in a chain of 200 amino acids. What is that number? (1)...
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