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Lewis Structures for Formaldehyde

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Questions and Answers

Which of the following is the correct way to draw a bond-line drawing of a molecule?

Draw all the atoms and bonds, including the H's connected to atoms other than C

Draw the C's and H's as far apart as possible

Show all C's and H's in the molecule

Only draw the bonds between the atoms, and omit the C's and H's (correct)

What change would be observed in the reaction of adding two hydrogen atoms to a molecule with a double bond?

The number of hydrogen atoms would increase by two (correct)

A new double bond would be formed

The double bond would be eliminated and replaced by a single bond

The number of hydrogen atoms would decrease by two

What type of chemical bond is formed when an electropositive element reacts with an electronegative element?

Metallic bond

Covalent bond

Ionic bond (correct)

Hydrogen bond

How is the polarity of a bond determined?

By the difference in electronegativity between the two atoms Signup and view all the answers

What type of bond is formed in all organic compounds?

Covalent bond Signup and view all the answers

What is the classification of a bond based on the difference in electronegativity between the two atoms?

Polar covalent bond Signup and view all the answers

What is the definition of an atom's formal charge in a Lewis structure?

The difference between the number of valence electrons in an isolated atom and the number of electrons assigned in the Lewis structure Signup and view all the answers

In a Lewis structure, what is the formula to calculate the formal charge on an atom?

Total number of valence electrons in the free atom - total number of nonbonding electrons - 1/2 (total number of bonding electrons) Signup and view all the answers

What does the sum of the formal charges of atoms in a molecule or ion need to equal?

Charge on the molecule or ion Signup and view all the answers

In a Lewis structure, what does a negative formal charge on an atom indicate?

Deficiency of electrons Signup and view all the answers

According to the rules for drawing Lewis structures, which statement is correct?

A Lewis structure with no formal charges is preferred over one with formal charges. Signup and view all the answers

Which of the following is the most plausible Lewis structure for CH₂O?

H₂C=O Signup and view all the answers

In the Lewis structure for CH₄O, how many lone pairs of electrons should be assigned to the oxygen atom?

3 lone pairs Signup and view all the answers

When drawing triple bonds in organic molecules, which statement is correct?

Triple bonds should be drawn in a straight line. Signup and view all the answers

How many hydrogen atoms are connected to each carbon atom in the molecule with 14 carbon atoms mentioned in the text?

The information cannot be determined from the text. Signup and view all the answers

When drawing zigzag patterns for carbon chains, which statement is correct?

The direction in which you start drawing the zigzag does not matter. Signup and view all the answers