Steps for Converting Molecular Formula to Lewis Structure

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Questions and Answers

Which atom in a molecule is always placed in a terminal position?

  • Carbon
  • Nitrogen
  • Oxygen
  • Hydrogen (correct)

What is the maximum number of electrons that can be found in the outermost energy level of an atom of C, N, O, or F?

  • 6
  • 10
  • 12
  • 8 (correct)

In a Lewis structure, which type of bond is formed from lone pairs to give an atom an octet?

  • Triple bond
  • Ionic bond
  • Double bond (correct)
  • Single bond

What is the first step in writing a Lewis structure of a molecule?

<p>Write the correct skeletal structure for the molecule (A)</p> Signup and view all the answers

Which of the following elements is known to form multiple bonds?

<p>Carbon (A)</p> Signup and view all the answers

What is the reason for placing the most electronegative atoms in terminal positions when writing a Lewis structure?

<p>To minimize electron-electron repulsion (D)</p> Signup and view all the answers

What is the primary purpose of a Lewis structure?

<p>To represent the type of bonds and lone electrons in a molecule (C)</p> Signup and view all the answers

What do the connectors (lines or sticks) between element symbols represent in a Lewis structure?

<p>Covalent bonds (D)</p> Signup and view all the answers

What is the purpose of the dots around element symbols in a Lewis structure?

<p>To represent un-shared valence electrons (A)</p> Signup and view all the answers

Which of the following molecules is most likely to have a linear structure according to its Lewis structure?

<p>COâ‚‚ (C)</p> Signup and view all the answers

Which element is typically considered the central atom in a Lewis structure?

<p>The element with the most bonds (A)</p> Signup and view all the answers

What is the benefit of using Lewis structures to represent molecules?

<p>They provide a simplified representation of the molecule's bonds and lone electrons (C)</p> Signup and view all the answers

What is the primary goal of distributing electrons in a Lewis structure?

<p>To give each atom a full octet (D)</p> Signup and view all the answers

Which atom is typically placed at the center of a molecule when writing a Lewis structure?

<p>The atom with the lowest electronegativity (B)</p> Signup and view all the answers

What is the purpose of Step 3 in writing a Lewis structure?

<p>To draw a single bond from each surrounding atom to the central atom (B)</p> Signup and view all the answers

How many valence electrons are present in the NF3 molecule?

<p>26 valence electrons (A)</p> Signup and view all the answers

What is the correct order of steps when writing a Lewis structure?

<p>Determine valence electrons, place atoms relative to each other, draw single bonds (A)</p> Signup and view all the answers

What is the significance of the octet rule in writing Lewis structures?

<p>It ensures each atom achieves a full octet of eight electrons (A)</p> Signup and view all the answers

What is the ultimate goal of distributing electrons in a Lewis structure?

<p>To ensure that all atoms have a full octet (A)</p> Signup and view all the answers

What is the primary reason for forming multiple bonds in a Lewis structure?

<p>To ensure that all atoms have a full octet (D)</p> Signup and view all the answers

Which of the following is a characteristic of a terminal atom in a Lewis structure?

<p>It has at least one lone pair (C)</p> Signup and view all the answers

What is the outcome of converting a lone pair to a bonding pair in a Lewis structure?

<p>The formation of a multiple bond (D)</p> Signup and view all the answers

In a Lewis structure, what is the significance of the octet rule?

<p>It ensures that all atoms have a full octet (A)</p> Signup and view all the answers

What is the purpose of writing a Lewis structure?

<p>To represent the distribution of electrons in a molecule (B)</p> Signup and view all the answers

In writing Lewis structures, which type of atom is typically placed in the central position?

<p>The atom with the lowest electronegativity (A)</p> Signup and view all the answers

Why is it not necessary for an array to be symmetric when writing Lewis structures?

<p>Symmetric arrays result in incorrect molecular geometries (A)</p> Signup and view all the answers

What is the primary purpose of adding single bonds before distributing electron pairs in Lewis structures?

<p>To satisfy the octet rule for the central atom (C)</p> Signup and view all the answers

Which step in writing Lewis structures ensures that each atom ends up with a full octet?

<p>Distributing electron pairs to the atoms (C)</p> Signup and view all the answers

What effect does a negative charge have on the total valence electrons in a Lewis structure?

<p>Increases the valence electrons by one (C)</p> Signup and view all the answers

Why is it crucial to add single bonds before giving each atom a complete octet in Lewis structures?

<p>To establish the connectivity between atoms (B)</p> Signup and view all the answers

Why do chemists prefer condensed structural formulas over molecular formulas in Organic Chemistry?

<p>To highlight the central atoms in the molecules (A)</p> Signup and view all the answers

Which rule states that carbon and oxygen should obey the octet rule in terminal positions of molecular structures?

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

What is the primary factor that determines whether an atom is placed centrally or terminally in a Lewis structure?

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

Why is knowing the duet rule for hydrogen and the octet rule for carbon and oxygen crucial in writing Lewis structures?

<p>To guide the placement of atoms within a molecular structure (C)</p> Signup and view all the answers

How does the knowledge of the octet rule assist in correct molecular structure identification?

<p>By ensuring each atom has precisely 8 valence electrons (D)</p> Signup and view all the answers

When writing Lewis structures, why is the identification of the central atoms important in molecular representations?

<p>To facilitate understanding the connectivity of atoms (A)</p> Signup and view all the answers

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