AP Chemistry Unit 2 Review

The Lewis structure of the CO₃^2- ion is

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Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

In the nitrite ion (NO₂^-), __________.

• both bonds are single bonds

• both bonds are double bonds

• both bonds are the same because of resonance

• there are 20 valence electrons

• there is one single and one double bond

Tags

NGSS.HS-PS1-2

Of the possible bonds between carbon atoms (single, double, and triple), _____.

• a triple bond is longer than a single bond

• a double bond is stronger than a triple bond

• a single bond is stronger than a triple bond

• a double bond is longer than a triple bond

• a single bond is stronger than a double bond

The formal charge on carbon in the molecule shown is _______.

• 0

• +1

• +2

• +3

• -1

Tags

NGSS.HS-PS1-2

In the Lewis structure of ClF, the formal charge on Cl is _______ and the formal charge on F is _______.

• 0,0

• -1, -1

• 0, -1

• -1, 0

• +1, -1

Tags

NGSS.HS-PS1-1

In the resonance form of ozone shown, the formal charge on the central oxygen atom is _______.

• 0

• +1

• -1

• +2

• -2

Tags

NGSS.HS-PS1-2

The electronegativity of C is 2.5, F is 4.0.  predict the character of a C-F bond.

• polar covalent
• nonpolar covalent
• ionic
• metallic

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

Choose the correct shape for H₂S

• Tetrahedral

• Trigonal pyramidal

• Bent

• Trigonal planar

The following molecules all contain polar bonds however only one is a polar molecule.  Which one?

• CCl₄
• CO₂
• NH₃
• CH₄

 A lone pair is defined as

• A pair of bonding electrons
• One non-bonding electron
• A pair of non-bonding electrons
• A pair of electrons on the central atom