p45 17-25 critical thinking 1-5

p45 17-25 critical thinking 1-5 - Joseph Leonard p45 17-25...

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Joseph Leonard – 10/29/07 – p45 17-25 Critical Thinking 1-5 17. An oxygen atom has six electrons in its outermost energy level. Explain why two oxygen atoms must share four electrons when they form a covalent bond. An atom always wants to have eight electrons in its outer shell. If they share four electrons, then they can both achieve this. 18. What is an ion? An ion is an atom or molecule with an electrical charge. 19. How are electrons distributed in a covalent bond? In a covalent bond, atoms share one or more electrons. 20. Name the physical states that matter can exist in. Matter can exist in the state of gases, liquids, and solids. 21. In a chemical equation, what does a two-direction arrow mean? A two-direction arrow means that the two sides can go in both directions. 22. Many reactions in the cell are exergonic. Why, then, do cells need a continuous supply of energy? They need to constantly take in energy because they are also constantly releasing energy in their exergonic reactions. 23. What happens when water dissociates?
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This note was uploaded on 12/09/2009 for the course CHEM 204 taught by Professor Donnegan during the Spring '08 term at Alabama.

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p45 17-25 critical thinking 1-5 - Joseph Leonard p45 17-25...

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