1441answertest4

1441answertest4 - Answer Key Test 4 Chapters 8, 9 & 10...

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1. B 2. C ( HCN and CO 2 ) 3. D 4. C 5. Polar Covalent HCl ( two nonmetals, different electronegativity) 100% Covalent Cl 2 , H 2 (diatomic molecules) Ionic Compounds NaCl ( usually metal and nonmetal- electronegativity difference greater than 1.7) The difference in electronegativity determines the bond type. 6. HF Greatest difference in electronegativity 7. C 8. E (none are metal/nonmetal combinations) 9. D Formal Charge = Valence Electrons – Electrons assigned by the drawing. Choose the drawing with formal charges nearest to zero. If two drawings have the same formal charges, the drawing assigning the negative charge to the most electronegative element is favored. 10. C ( Resonance – can draw more than one Lewis Dot Structure. Usually is based on a double bond shifting positions in the molecule.) 11. D ( Remember, boron is usually electron deficient and has 6 electrons around the atom. ) 12. ∆H = Bonds Broken(reactants) – Bonds Formed(products)
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1441answertest4 - Answer Key Test 4 Chapters 8, 9 & 10...

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