W2-Lewis Structures

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Questions and Answers

Which molecule exhibits an exception to the octet rule?

  • $CHBr_3$
  • $SF_4$
  • $CO_2$
  • $NO$ (correct)

What is the total number of valence electrons in bromoform (CHBr3)?

  • 32
  • 20
  • 26 (correct)
  • 18

Which molecule has more than an octet for one of its atoms?

  • $CHBr_3$
  • $NO_2$
  • $CO_2$
  • $SF_4$ (correct)

What type of molecules are exceptions to the octet rule?

<p>Molecules with an odd number of electrons and those in which an atom has less than an octet. (D)</p> Signup and view all the answers

What is the formula for calculating formal charges in a Lewis structure?

<p>Number of valence electrons minus number of electrons assigned to the atom (B)</p> Signup and view all the answers

In the Lewis structure of NO+, how many valence electrons are there?

<p>10 (B)</p> Signup and view all the answers

Which atom is preferred to have a positive formal charge in a Lewis structure?

<p>The least electronegative atom (A)</p> Signup and view all the answers

What does resonance refer to in the context of Lewis structures?

<p>Redistribution of valence electrons (B)</p> Signup and view all the answers

What is a radical or free radical in chemistry?

<p>$O_2$ molecule with unpaired electrons (C)</p> Signup and view all the answers

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